context stringlengths 545 71.9k | questionsrc stringlengths 16 10.2k | question stringlengths 11 563 |
|---|---|---|
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | $ 1.~ $ combustion reactions a combustion reaction is a redox reaction between a compound and molecular oxygen ( $ \text o_2 $ ) to form oxygen-containing products . when one of the reactants is a hydrocarbon , the products include carbon dioxide and water . the following reaction is the combustion of octane , a hydroc... | pm why is it that phenolphthalein is soluble in ethanol but not soluble in water though both ethanol and water are polar ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | that means we need the number of electrons being transferred in each half-reaction to be equal . we can multiply the reduction half-reaction by $ 3 $ and multiply the oxidation half-reaction by $ 2 $ so both reactions involve the transfer of $ 6 $ electrons : $ \redd { 3 } \times [ \text { cu } ^ { 2+ } ( aq ) + { 2e^-... | of -2 , but cl is more electronegative than o right ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | our reaction is balanced for both mass and charge . summary we can identify redox reactions by checking for changes in oxidation number . redox reactions can be split into oxidation and reduction half-reactions . | so cl should have an oxidation number with a negative sign right ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | we need to make sure both the atoms and the charges are balanced ! we will use the half-reaction method to balance the reaction . reduction half-reaction : the reduction half-reaction shows the reactants and products participating in the reduction step . | how would i balance the charges on a half-reaction if the charges on either side are zero ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | we will go over these terms using the following example reaction : $ 2 \text { fe } _2 \text o_3 ( s ) + 3 \text c ( s ) \rightarrow 4 \text { fe } ( s ) + 3 \text { co } _2 ( g ) $ here are some questions we want to be able to answer : $ 1.~ $ is this reaction a redox reaction , and how do we know ? $ 2.~ $ if this is... | what is being oxidized and reduced in the following equation and why ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | question $ 2 $ : carbon being oxidized because it is losing electrons as the oxidation number increases from $ 0 $ to $ +4 $ . iron is being reduced because it is gaining electrons when the oxidation number decreases from $ +3 $ to $ 0 $ . question $ 3 $ : the reducing agent is the reactant that is being oxidized ( and... | 2fe2o3 why is the oxidation number of 2fe2 +3 ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | oxygen has an oxidation number of $ -2 $ in both $ \text { clo } ^- $ and $ \text { clo } _3^- $ , so it does not get oxidized or reduced in the reaction . $ 3.~ $ single replacement reactions a single replacement reaction ( or single displacement reaction ) involves two elements trading places within a compound . for ... | if there is no reaction such copper added to hydrochloric acid , would there be gas formation ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | another way to think of this that we want to make sure that any electrons that are released in the oxidation half-reaction get used up in the reduction half-reaction . otherwise we would have stray electrons floating around ! that means we need the number of electrons being transferred in each half-reaction to be equal... | if there was no gas formation would n't the reactant stay the same meaning that there is no equation as well , right ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | our reaction is balanced for both mass and charge . summary we can identify redox reactions by checking for changes in oxidation number . redox reactions can be split into oxidation and reduction half-reactions . we can use the half-reaction method to balance redox reactions , which requires that both mass and charge a... | in the disproportionation reactions example , why did the oxidation number increased from +1 to +5 when it oxidized by oxygen ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | at the same time , the chlorine in some other molecules of $ \text { clo } ^- $ are being reduced to $ \text { cl } ^- $ ( where the oxidation number decreases from $ +1 $ to $ -1 $ ) . oxygen has an oxidation number of $ -2 $ in both $ \text { clo } ^- $ and $ \text { clo } _3^- $ , so it does not get oxidized or redu... | why is the oxidation number of oxygen -2 when the previous article ( oxidation numbers ) states that oxygen is positive when in a binary compound with flourine ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | the following reaction is for the disproportionation of hypochlorite , $ \text { clo } ^- $ : $ 3\text { clo } ^- ( aq ) \rightarrow \text { clo } _3^- ( aq ) + 2\text { cl } ^- ( aq ) $ if we analyze the oxidation numbers for chlorine , we see that the reactant $ \text { clo } ^- $ is being oxidized to $ \text { clo }... | how is the cl oxidation number equal to 1+ in 3clo- ? |
what is a redox reaction ? a redox ( or oxidation-reduction ) reaction is a type of chemical reaction that involves a transfer of electrons between two species . we can tell there has been a transfer of electrons if there is any change in the oxidation number between the reactants and the products . redox reactions are... | reduction half-reaction : the reduction half-reaction shows the reactants and products participating in the reduction step . since $ \text { cu } ^ { 2+ } $ is being reduced to $ \text { cu } ( s ) $ , we might start by writing out that step : $ \text { cu } ^ { 2+ } ( aq ) \rightarrow \text { cu } ( s ) $ however , th... | is option b is correct ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we are working to create more questions in general . q : the system started me at level 2 , easier , but i ’ m ready for level 3 or 4 . can i skip ahead to those questions ? | will there be questions that are a higher level than level 4 ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | how do i send my sat date to get my practice stuff designed according to how much time i have left till the day i take my sat ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we are working to create more questions in general . q : the system started me at level 2 , easier , but i ’ m ready for level 3 or 4 . can i skip ahead to those questions ? | what level at school do i got be to take the test ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : your practice on official sat practice will help you earn some of the points- and video-based badges available on khan academy , but we still need to create specialized badges that apply well to the sat practice system . q : can i use my collegeboard extended time accommodation when practicing for the sat on khan a... | when would be the ideal time for me take the sat in order to be admitted to ivy league schools ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | 2 . if you can see your scores on collegeboard.org , visit your khan academy settings and click `` disconnect from college board '' . 3 . | once the scores from psat test have been linked from the college board site , does khan set up a group of activities based on scores to assist practice/needs ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can visit khanacademy.org/sat on your mobile web browser to use the practice system ; turn your phone sideways for the best experience . we do not have a dedicated smartphone app for this system , but you may also want to try the college board ’ s sat practice app . q : can i earn badges for doing sat practice ... | is there a way to toggle scratchpad on sat math practice areas ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . | is there a limited amount of sat practice on my account , in terms of questions/passages ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | my test is january 14 , and i just started studying today , so could anyone also please include a study schedule so i can still get a high score ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | i would like to know how long would it take to complete these series of quizzes so that he can take the sat practice test ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can visit khanacademy.org/sat on your mobile web browser to use the practice system ; turn your phone sideways for the best experience . we do not have a dedicated smartphone app for this system , but you may also want to try the college board ’ s sat practice app . q : can i earn badges for doing sat practice ... | what is the length of time frame for taking the sat practice exam ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the button will change to '' connect to college board '' – click it . you will be prompted again to send your exam results . once that 's complete , your 2015 psat/nmsqt® scores should now be visible . | does the whole exam need to be taken in one sitting or can it be broken down into parts ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : in the diagnostic quizzes , you can tell the system you ’ re guessing , but you ’ re right , you can ’ t currently do that in other places . this is on our list of things to add . q : what do the different skill levels mean ? do they map to the mastery levels in regular khan academy math ? | what do the different shades of blue mean on the wifi-looking symbol on the list of math skills i can practice ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | official practice for the sat may contain too much of the harder content to be really useful for you , but you are welcome to try out practicing with us . skill levels and practice questions q : i ’ ve answered all the level 4 ( most challenging ) questions for a skill but i 'd still like to keep practicing . is there ... | can we get score estimates based on our skill level/progress ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | can someone help me understand what it is graded out of and what is a good score ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | how much time does it take to take the practice sat test ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we are planning to add ways for both students and their coaches to view their progress . q : why isn ’ t the activity tab in my profile showing my sat practice activity ? a : we ’ re working on making your sat practice activity show up there and also planning to add a place to view your progress and review your answers... | if i take the pdf version of a practice sat test , will it be marked as a completion on my activity tab ( schedule ) ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . the college bo... | is the official sat practice test day going to be at a specific time ( where everyone takes it at the same time like a real sat ) or is it a reminder day to practice for the sat ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | in the sat , would my different method of solving the equation affect my score ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . | greetings , i am a homeschool striving to study for the sat and i wanted to know anyone else is doing to accompanying the aid of khan academy with any mentoring for a low budget income student besides kaplan ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we 're not able to read in psat/nmsqt® scores from 2014 or earlier or 2400-point-scale sat scores . 2 . if you can see your scores on collegeboard.org , visit your khan academy settings and click `` disconnect from college board '' . | my mean if i want to take the test pm in china ( gmt +8 ) , then do i need to schedule am ( gmt -5 ) ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : can i earn badges for doing sat practice like i can when studying other subjects on khan academy ? a : your practice on official sat practice will help you earn some of the points- and video-based badges available on khan academy , but we still need to create specialized badges that apply well to the sat practice s... | do i need to log in in order to use the revision assistant for the sat essay practice ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . the college bo... | how do i sign up for the sat question of the day ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : we agree this would be more efficient , but we haven ’ t built this into the system yet . once the oct 2015 psat/nmsqt® results are released , you will be able to connect your actual psat/nmsqt® results in lieu of taking the diagnostic quizzes . q : on the reading and writing and language tests , i 'm having troubl... | i 've taken a psat test before with a different company than college board , is there a way i could upload the results ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | this is on our list of things to add . q : what do the different skill levels mean ? do they map to the mastery levels in regular khan academy math ? | what do the shades and boxes in the semi circle mean ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : on the practice and diagnostic tests , it can be tricky to discern whether you are looking at an underlined comma , semicolon , period , or colon . these punctuation marks will be underlined when they are part of the question being asked . this will not be an issue when you take the sat itself ; the underline will ... | hi , for the essay , would marks be deducted for spelling ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college board . what can i do ? | how do i link my psat/nmsqt scores without a college board account ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : for the psat/nmsqt® , you can practice right here ! the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . | why isnt there an essay section in your individual practise section ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : i took a full practice exam , but the system still wants me to complete the diagnostic quizzes . can ’ t the system just use my practice exam to set my starting levels and practice recommendations ? a : we agree this would be more efficient , but we haven ’ t built this into the system yet . | when will more practice tests be uploaded ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | is there a way i can practice the questions from the other levels ? a : we don ’ t currently have a way for you to switch to questions from an earlier level without your intentionally missing questions to drop your level down . we are working to create more questions in general . q : the system started me at level 2 , ... | are the articles and reading materials on another level of difficulty and the questions level four , or are the articles the same difficulty as the level 3 or 2 with questions varying in difficulty ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . the college bo... | should the sat i and sat ii score be sent to the university at the same time ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can visit khanacademy.org/sat on your mobile web browser to use the practice system ; turn your phone sideways for the best experience . we do not have a dedicated smartphone app for this system , but you may also want to try the college board ’ s sat practice app . q : can i earn badges for doing sat practice ... | is it possible to take the practice sat tests over multiple days , or do you have to do it all in one day ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | this is on our list of things to add . q : what do the different skill levels mean ? do they map to the mastery levels in regular khan academy math ? | are the diagnosed skill levels based off the psat most recently taken ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : here are the steps you should take to straighten this out : 1 . log in to collegeboard.org and check that you can see your psat/nmsqt® or psat 8/9 scores . we 're not able to read in psat/nmsqt® scores from 2014 or earlier or 2400-point-scale sat scores . | how can i connect my psat scores to my collegeboard account ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . the college bo... | i am 10th grade i am planing on taking the sat next year in 11th grade , i just wanted to know is study during summer break enough or should i start now ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | i 'm supposed to take my sat today on khan academy , but there does not seem to be a button allowing my to take my exam , it simply says `` review tips for test day '' do i have to go some place locally available to take it ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . the college bo... | after i have set up a class specifically for sat prep and my student has enabled sharing , how do i access the sat class tab ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . | how many times you can take the sat test for free ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we are working to create more questions in general . q : the system started me at level 2 , easier , but i ’ m ready for level 3 or 4 . can i skip ahead to those questions ? | i am getting level 3 , and 4 questions , and constantly get them wrong t the rate of 2 out of 11. how do i move down a level to wok my way up ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : here are the steps you should take to straighten this out : 1 . log in to collegeboard.org and check that you can see your psat/nmsqt® or psat 8/9 scores . we 're not able to read in psat/nmsqt® scores from 2014 or earlier or 2400-point-scale sat scores . | how to earn psat 8/9 earth badge ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | the ipone app did not score my test correctly ( see my chart ) i was able to get it to rescan - but the old scores are there and messing up the recomendations - how do i delete practice tests which are scored incorrectly ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | how can i know the exact date of when i will take my psat exam so i can set up my practicing schedule ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | this is on our list of things to add . q : what do the different skill levels mean ? do they map to the mastery levels in regular khan academy math ? | some of skills are preceded by a light purple logo and others have a dark purple logo , what does this mean ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | when does my sat score show up ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! | is there a certificate of completion , or other document of equivalence , issued at the end of this course ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : i took a full practice exam , but the system still wants me to complete the diagnostic quizzes . can ’ t the system just use my practice exam to set my starting levels and practice recommendations ? a : we agree this would be more efficient , but we haven ’ t built this into the system yet . | are the practice tests made to be more around the current levels you 're working on , or did i just do really bad ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | you can , however , download the practice exams . q : do you have an iphone or android app i can use for sat practice ? a : you can visit khanacademy.org/sat on your mobile web browser to use the practice system ; turn your phone sideways for the best experience . | which part of your excellent website can i use to find lessons and solved examples relating to the topics included in math sat 2016 ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | official practice for the sat may contain too much of the harder content to be really useful for you , but you are welcome to try out practicing with us . skill levels and practice questions q : i ’ ve answered all the level 4 ( most challenging ) questions for a skill but i 'd still like to keep practicing . is there ... | my question is : on the psats and sats , are the passages chosen on random from any skill level , that is , from simple to more complex ; does this also apply to the questions associated with those passages ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | are there any choices in the sat exam which comprises of maths , reading , writing and an essay , and if yes then how much questions can we afford to leave while still being able to score hundred percent score ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : we don ’ t currently have a way for you to instantly switch what level of questions you are working on . q : i ran into a mistake on a question . how can i let you know it needs to be fixed ? a : when you encounter a mistake on a question , you should click the “ report a mistake ” link in the footer of the page wh... | do we have solutions for each question to know our mistakes ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | we are working to create more questions in general . q : the system started me at level 2 , easier , but i ’ m ready for level 3 or 4 . can i skip ahead to those questions ? | if i had reach all the portions level 4 , what does that means ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | this is on our list of things to add . q : what do the different skill levels mean ? do they map to the mastery levels in regular khan academy math ? | i mean do we have to learn to convert from feet to inches to yards and so on ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! | how was the 225 computated ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | the practice tests state that 24 correct answers is a score of 500 , while college board materials my students have received state that 26 correct answers is a 500 ... which is correct ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : can i use my collegeboard extended time accommodation when practicing for the sat on khan academy ? a : yes , you can visit your khan academy settings and fill in the form there . you will then be able to use the extended time on all full practice tests and timed mini-sections that you take on khan academy . contac... | does khan academy offer an opportunity to take practice tests in a real life testing center situation near you instead of online ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | what can i do ? a : here are the steps you should take to straighten this out : 1 . log in to collegeboard.org and check that you can see your psat/nmsqt® or psat 8/9 scores . | and does anyone really take advantage of these opportunities ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : you can download the practice exams , but to upload your results into our system and get new recommendations , you will need to enter the answers from your answer sheet into the regular online practice exam . you can use the college board ’ s sat practice app to take a picture of your paper exam sheet and get the s... | how do i calculate my test score from the college board book diagnostic tests ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | do you have to take the saturday practice tests 0 , or can you take them anytime of the day ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : can i earn badges for doing sat practice like i can when studying other subjects on khan academy ? a : your practice on official sat practice will help you earn some of the points- and video-based badges available on khan academy , but we still need to create specialized badges that apply well to the sat practice s... | how do i make the personalized practice based upon my sat score and not my psat score ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . | how do i change my amount of questions i would like to receive for my daily practice for sat ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | the psat/nmsqt® has the same content as the sat but minus the hardest questions and the essay . you can also download a psat/nmsqt® practice exam to take on paper . the psat 8/9 has the same structure as well but with even more hard sat content removed . | is there a way i could take them down and just do a diagnostic exam to see where i 'm at currently ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : the skill levels are different than the regular khan academy math mastery system levels . for sat , higher levels contain harder questions . you will also move up or down through the levels depending on how many questions you answer correctly . | how do i answer the questions on the sat , i mean do i need to circle the right choice or to remove the wrong choices , or they 'll give us an answer paper sheet where we need to fill in the blanks ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | 3 . the button will change to '' connect to college board '' – click it . you will be prompted again to send your exam results . | how do you change the email for who reminders are sent to ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | q : i took a full practice exam , but the system still wants me to complete the diagnostic quizzes . can ’ t the system just use my practice exam to set my starting levels and practice recommendations ? a : we agree this would be more efficient , but we haven ’ t built this into the system yet . | i 'm taking the sat without the essay- can i set my practice so it does n't make me practice writing ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | a : the skill levels are different than the regular khan academy math mastery system levels . for sat , higher levels contain harder questions . you will also move up or down through the levels depending on how many questions you answer correctly . | is there a way to see a predicted sat score based on how i have done on the questions ? |
check out our answers to folks ' frequently asked questions . if we still have n't answered your question , contact us ! and always let us know if you have a problem or a sweet idea for making this system better . top questions q : my psat/nmsqt® scores are n't showing up , but i already connected my account to college... | for your practice , you can enlarge your screen view if you ’ re having trouble seeing the punctuation . q : how does khan academy create the official sat practice exams and test questions ? official sat practice on khan academy is a partnership with the college board , the company that creates the sat . | out of how much are these displayed sat test scores on the full test ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | when removing volatiles from a sample , make sure to dry to constant mass . always tare your glassware ! to read more about another common type of gravimetric analysis , see this article on precipitation gravimetry . | what does taring a piece of glassware mean ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | convert moles of water to moles of $ \text { bacl } _2 \cdot 2 \text h_2 \text o $ we can convert the moles of water to moles of $ \text { bacl } _2 \cdot 2 \text h_2 \text o $ using the mole ratio from the balanced reaction . $ \text { mol of bacl } _2 \cdot 2 \text h_2 \text o=2.05 \times 10^ { -2 } \ , \cancel { \te... | so why do we have to take into account the 2 in bacl2.2h2o but not the one in 2h2o ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | $ \text { mass of water } =0.37\ , \cancel { \text { g h } _2 \text o } \times \dfrac { 1 \ , \text { mol h } _2 \text o } { 18.02\ , \cancel { \text { g h } _2 \text o } } =2.05 \times 10^ { -2 } \ , \text { mol h } _2 \text o $ step $ 3 $ . convert moles of water to moles of $ \text { bacl } _2 \cdot 2 \text h_2 \tex... | but should n't it be 2 moles of h2o ( g ) for everyone one mole of bacl2 and 2 moles of h2o ( g ) for every 2 moles of h2o from the reactant ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | lab tip : surface area is always a factor when removing volatiles from a sample . having a higher surface area will increase the rate of evaporation . you can increase the surface area of the sample by spreading your sample as thinly as possible on the heating surface or breaking up any larger chunks of solid , since m... | should n't it be `` having a low ( flat/plane ) surface area will increase the rate of evaporation ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | note : we don ’ t know anything about how much of the contaminant , $ \text { kcl } $ , is in the mixture . it could be anywhere from $ 0-100 \ % \ , \text { kcl } $ by mass ! it probably isn ’ t $ 100\ % \ , \text { kcl } $ though , since we did lose water after heating . | then , is the mass of kcl equal to 9.51g - 0.37g ( h2o ) - 2.51g ( bacl2'2h2o ) = 6.63g ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . | how would you find the gravimetric factor from grams of pcl3 to grams of p ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | we can convert moles of $ \text { bacl } _2 \cdot 2 \text h_2 \text o $ to mass in grams using the molecular weight of $ \text { bacl } _2 \cdot 2 \text h_2 \text o $ . $ \text { mass of bacl } _2 \cdot 2 \text h_2 \text o=1.03 \times 10^ { -2 } \ , \cancel { \text { mol bacl } _2 \cdot 2 \text h_2 \text o } \times \df... | how can amu of bacl2 = 247.47 when ba = 137.3 and cl is 35.45*2 ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . | can gravimetric analysis be used to determine the identity of an unknown substance ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | how does that affect our calculations ? in this situation , the difference in mass we calculate in step $ 1 $ will be lower than it should be , so we will have correspondingly fewer moles of water in step $ 2 $ . that will result in calculating a lower percent mass of $ \text { bacl } _2 \cdot 2 \text h_2 \text o $ com... | what is the difference between limiting reactant and limiting reagent ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | as you continue to heat the sample , the change in mass gets smaller since there is less water left in the sample to evaporate . at some point , there won ’ t be enough water left to make a significant change in mass , so the measured mass will stay approximately constant over multiple measurements . at that point , yo... | why is n't the mass of water .37 grams or 96.11 % ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | ultimately , we would end up concluding that our sample has a much higher purity than it actually does ! concept check : what mass of metal hydrate would we calculate in situation $ 1 $ ? the moral of this story ? | what if igor contaminated a metal hydrate with another metal hydrate or some solution ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | let 's go through the calculation step-by-step . step $ 1 $ : calculate change in sample mass we can find the amount of water lost during the heating process by calculating the change in mass for our sample . $ \begin { align } \text { mass of } \text h_2 \text o & amp ; = \text { initial sample mass } - \text { final ... | are we assuming that when the sample was contaminated , only kcl was mixed in and no additional amount of water was added ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . | in gravimetric analysis of a metal carbonate , what two componds are dissolved in the filtrate after the suction filtration step ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | situation $ 2 $ : we ran out of time and not all the water evaporated in the second situation , we did not fully dehydrate our sample . this could happen for a lot of reasons , unfortunately . for example , we could run out of time , the heat could be set too low , or maybe we just took the sample off the heat before i... | what could you do to ensure that the crucible and precipitate is dry ? |
what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . the chemical we are trying to quantify is sometimes called the analyte . we might use gravimetric analysis to answer questions such as : what is the... | what is gravimetric analysis ? gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a substance by measuring a change in mass . | how to minimize impurities in gravemetric analysis ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | the number which rotates the plane in this way is $ \cos ( 72^\circ ) + i\sin ( 72^\circ ) $ , since $ \dfrac { 360^\circ } { 5 } = 72^\circ $ . there are also other solutions , such as rotating $ \dfrac { 2 } { 5 } $ of the way around : or $ \dfrac { 1 } { 5 } $ of the way around the other way : in fact , beautifully ... | in example 4 , z^6 = -27 , it says that it is suppose to rotate 180 degrees because of the negative sign ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | powers of complex numbers let 's play around some more with repeatedly multiplying by some complex number . example 1 : $ ( 1 + i\sqrt { 3 } ) ^3 $ take the number $ z = 1 + i\sqrt { 3 } $ , which has absolute value $ \sqrt { 1^2 + ( \sqrt { 3 } ) ^2 } = 2 $ , and angle $ 60^\circ $ . what happens if we multiply everyt... | in the example 2 , can those points make a spiral ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | hence all the answers will be of the form $ z = \sqrt [ n ] { r } \cdot \left ( \cos\left ( \dfrac { \theta + 2k\pi } { n } \right ) + i\sin\left ( \dfrac { \theta + 2k\pi } { n } \right ) \right ) $ for some integer value of $ k $ . these values will be different as $ k $ ranges from $ 0 $ to $ n-1 $ , but once $ k=n ... | how do i determine what to add to ( 360 ) k ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | hence , at the end it 's the same as multiplying by $ -8 $ , so $ ( 1 + i\sqrt { 3 } ) ^3 = -8 $ . we can also see this using algebra as follows : $ \begin { align } & amp ; \phantom { = } \left ( 2 ( \cos ( 60^\circ ) + i\sin ( 60^\circ ) ) \right ) ^3\\ & amp ; = 2^3 ( \cos ( 60^\circ + 60^\circ + 60^\circ ) + i\sin ... | can someone explain why if we are cubing cos ( 60 ) we get 180 degrees ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | the number which rotates the plane in this way is $ \cos ( 72^\circ ) + i\sin ( 72^\circ ) $ , since $ \dfrac { 360^\circ } { 5 } = 72^\circ $ . there are also other solutions , such as rotating $ \dfrac { 2 } { 5 } $ of the way around : or $ \dfrac { 1 } { 5 } $ of the way around the other way : in fact , beautifully ... | when solving z^6= -27 , how do i know the angle is 180 degrees ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | in fact , those answers form a perfect hexagon on the circle with radius $ \sqrt { 3 } $ : can you see why ? solving $ z^n= w $ in general let 's generalize the last two examples . if you are given values $ w $ and $ n $ , and asked to solve for $ z $ , as in the last example where $ n=6 $ and $ w = -27 $ , you first f... | in general , how do i find the angle when i have to solve z^n=w ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | is a summary review in order here ? |
connection between $ i^2 = -1 $ and where $ i $ lives we began our study of complex numbers by inventing a number $ i $ that satisfies $ i^2 = -1 $ , and later visualized it by placing it outside the number line , one unit above $ 0 $ . with the visualizations offered in the last article , we can now see why that point... | in fact , those answers form a perfect hexagon on the circle with radius $ \sqrt { 3 } $ : can you see why ? solving $ z^n= w $ in general let 's generalize the last two examples . if you are given values $ w $ and $ n $ , and asked to solve for $ z $ , as in the last example where $ n=6 $ and $ w = -27 $ , you first f... | in the section `` solving z^n= w in general '' , why is the range 0 to n-1 ? |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.