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2. 4 β’ chemical formulas 81 figure 2. 21 ( a ) vinegar contains acetic acid, c2h4o2, which has an empirical formula of ch2o. it can be represented as ( b ) a structural formula and ( c ) as a ball - and - stick model. ( credit a : modification of work by β homespot hq β / flickr ) example 2. 6 empirical and molecular f... | openstax_chemistry2e-web | [
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beakers, and the like ) to fashion a β universal toolkit of chemistry. β this toolkit could be used to create custom - tailored drugs to fight a new superbug or to β print β medicine personally configured to your genetic makeup, environment, and health situation. says cronin, β what apple did for music, i β d like to d... | openstax_chemistry2e-web | [
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methyl formate as a substitute for a solution of acetic acid ( vinegar ) when you make salad dressing. figure 2. 23 molecules of ( a ) acetic acid and methyl formate ( b ) are structural isomers ; they have the same formula ( c2h4o2 ) but different structures ( and therefore different chemical properties ). many types ... | openstax_chemistry2e-web | [
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2. 4 β’ chemical formulas 83 in which the molecules differ in how the atoms are connected to each other. there are also various types of spatial isomers, in which the relative orientations of the atoms in space can be different. for example, the compound carvone ( found in caraway seeds, spearmint, and mandarin orange p... | openstax_chemistry2e-web | [
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2. 5 the periodic table learning objectives by the end of this section, you will be able to : β’ state the periodic law and explain the organization of elements in the periodic table β’ predict the general properties of elements based on their location within the periodic table β’ identify metals, nonmetals, and metalloid... | openstax_chemistry2e-web | [
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one step further than meyer : he used his table to predict the existence of elements that would have the properties similar to aluminum and silicon, but were yet unknown. the discoveries of gallium ( 1875 ) and germanium ( 1886 ) provided great support for mendeleev β s work. although mendeleev and meyer had a long dis... | openstax_chemistry2e-web | [
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2. 5 β’ the periodic table 85 figure 2. 26 elements in the periodic table are organized according to their properties. even after the periodic nature of elements and the table itself were widely accepted, gaps remained. mendeleev had predicted, and others including henry moseley had later confirmed, that there should be... | openstax_chemistry2e-web | [
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some properties of nonmetals β shaded purple ). 86 2 β’ atoms, molecules, and ions access for free at openstax. org the elements can also be classified into the main - group elements ( or representative elements ) in the columns labeled 1, 2, and 13 β 18 ; the transition metals in the columns labeled 3 β 123 ; and inner... | openstax_chemistry2e-web | [
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table, which you can use to explore the properties of the elements ( includes podcasts and videos of each element ). you may also want to try this one ( https : / / openstax. org / l / 16periodic2 ) that shows photos of all the elements. example 2. 7 naming groups of elements atoms of each of the following elements are... | openstax_chemistry2e-web | [
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2. 5 β’ the periodic table 87 ( b ) calcium ( c ) sodium ( d ) sulfur solution the family names are as follows : ( a ) halogen ( b ) alkaline earth metal ( c ) alkali metal ( d ) chalcogen check your learning give the group name for each of the following elements : ( a ) krypton ( b ) selenium ( c ) barium ( d ) lithium... | openstax_chemistry2e-web | [
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important medicines, used to help millions of people each year. they were awarded the nobel prize in 1988. in studying the periodic table, you might have noticed something about the atomic masses of some of the elements. element 43 ( technetium ), element 61 ( promethium ), and most of the elements with atomic number 8... | openstax_chemistry2e-web | [
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2. 6 ionic and molecular compounds learning objectives by the end of this section, you will be able to : β’ define ionic and molecular ( covalent ) compounds β’ predict the type of compound formed from elements based on their location within the periodic table β’ determine formulas for simple ionic compounds in ordinary c... | openstax_chemistry2e-web | [
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as atoms of the preceding noble gas, argon, and is symbolized ca2 +. the name of a metal ion is the same as the name of the metal atom from which it forms, so ca2 + is called a calcium ion. when atoms of nonmetal elements form ions, they generally gain enough electrons to give them the same number of electrons as an at... | openstax_chemistry2e-web | [
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2. 6 β’ ionic and molecular compounds 89 equal to the number of groups moved left from the noble gases. for example, group 17 elements ( one group left of the noble gases ) form 1β ions ; group 16 elements ( two groups left ) form 2β ions, and so on. this trend can be used as a guide in many cases, but its predictive va... | openstax_chemistry2e-web | [
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positive ions ( cations ). a magnesium atom must lose two electrons to have the same number electrons as an atom of the previous noble gas, neon. thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2 +. the symbol for the ion is mg2 +, and it is called a magnesium ion. nitrog... | openstax_chemistry2e-web | [
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them repeatedly, they will soon become familiar. common polyatomic ions name formula related acid formula ammonium hydronium peroxide hydroxide acetate acetic acid ch3cooh cyanide cnβ hydrocyanic acid hcn azide hydrazoic acid hn3 carbonate carbonic acid h2co3 table 2. 5 | openstax_chemistry2e-web | [
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2. 6 β’ ionic and molecular compounds 91 name formula related acid formula bicarbonate nitrate nitric acid hno3 nitrite nitrous acid hno2 sulfate sulfuric acid h2so4 hydrogen sulfate sulfite sulfurous acid h2so3 hydrogen sulfite phosphate phosphoric acid h3po4 hydrogen phosphate dihydrogen phosphate perchlorate perchlor... | openstax_chemistry2e-web | [
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result. covalent bonds are the attractive forces between the positively charged nuclei of the bonded atoms and one or more pairs of electrons that are located between the atoms. compounds are classified as ionic or molecular ( covalent ) on the basis of the bonds present in them. 92 2 β’ atoms, molecules, and ions acces... | openstax_chemistry2e-web | [
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can often recognize ionic compounds because of their properties. ionic compounds are solids that typically melt at high temperatures and boil at even higher temperatures. for example, sodium chloride melts at 801 Β°c and boils at 1413 Β°c. ( as a comparison, the molecular compound water melts at 0 Β°c and boils at 100 Β°c.... | openstax_chemistry2e-web | [
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2. 6 β’ ionic and molecular compounds 93 cations, al3 +, and oxygen anions, o2β. what is the formula of this compound? figure 2. 31 although pure aluminum oxide is colorless, trace amounts of iron and titanium give blue sapphire its characteristic color. ( credit : modification of work by stanislav doronenko ) solution ... | openstax_chemistry2e-web | [
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formula of this compound? solution the positive and negative charges must balance, and this ionic compound must be electrically neutral. thus, we must have two negative charges to balance the 2 + charge of the calcium ion. this requires a ratio of one ca2 + ion to two ions. we designate this by enclosing the formula fo... | openstax_chemistry2e-web | [
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covalent compounds ) result when atoms share, rather than transfer ( gain or lose ), electrons. covalent bonding is an important and extensive concept in chemistry, and it will be treated in considerable detail in a later chapter of this text. we can often identify molecular compounds on the basis of their physical pro... | openstax_chemistry2e-web | [
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hydrogen ( group 1 ) is a nonmetal, and chlorine ( group 17 ) is a nonmetal ; chcl3 is predicted to be molecular. ( d ) lithium ( group 1 ) is a metal, and carbonate is a polyatomic ion ; li2co3 is predicted to be ionic. check your learning using the periodic table, predict whether the following compounds are ionic or ... | openstax_chemistry2e-web | [
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2. 7 chemical nomenclature learning objectives by the end of this section, you will be able to : β’ derive names for common types of inorganic compounds using a systematic approach nomenclature, a collection of rules for naming things, is important in science and in many other situations. this module describes an approa... | openstax_chemistry2e-web | [
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na2o, sodium oxide kbr, potassium bromide cds, cadmium sulfide cai2, calcium iodide mg3n2, magnesium nitride csf, cesium fluoride ca3p2, calcium phosphide licl, lithium chloride al4c3, aluminum carbide table 2. 6 compounds containing polyatomic ions compounds containing polyatomic ions are named similarly to those cont... | openstax_chemistry2e-web | [
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##ch caco3 calcium carbonate ingredient in antacids mg ( oh ) 2, magnesium hydroxide ingredient in antacids al ( oh ) 3, aluminum hydroxide ingredient in antacids naoh, sodium hydroxide lye ; used as drain cleaner k3po4, potassium phosphate food additive ( many purposes ) mgso4, magnesium sulfate added to purified wate... | openstax_chemistry2e-web | [
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2. 7 β’ chemical nomenclature 97 compounds containing a metal ion with a variable charge most of the transition metals and some main group metals can form two or more cations with different charges. compounds of these metals with nonmetals are named with the same method as compounds in the first category, except the cha... | openstax_chemistry2e-web | [
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use by some segments of industry. for example, you may see the words stannous fluoride on a tube of toothpaste. this represents the formula snf2, which is more properly named tin ( ii ) fluoride. the other fluoride of tin is snf4, which was previously called stannic fluoride but is now named tin ( iv ) fluoride. ionic ... | openstax_chemistry2e-web | [
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ionic compounds ( a ) fe2s3 ( b ) cuse ( c ) gan ( d ) mgso4 Β· 7h2o ( e ) ti2 ( so4 ) 3 solution the anions in these compounds have a fixed negative charge ( s2β, se2β, n3β, and and the compounds must be neutral. because the total number of positive charges in each compound must equal the total number of negative charg... | openstax_chemistry2e-web | [
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2. 7 β’ chemical nomenclature 99 check your learning write the formulas of the following ionic compounds : ( a ) chromium ( iii ) phosphide ( b ) mercury ( ii ) sulfide ( c ) manganese ( ii ) phosphate ( d ) copper ( i ) oxide ( e ) iron ( iii ) chloride dihydrate answer : ( a ) crp ; ( b ) hgs ; ( c ) mn3 ( po4 ) 2 ; (... | openstax_chemistry2e-web | [
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##ium exists primarily in either the cr ( iii ) or cr ( vi ) forms. cr ( iii ), an ingredient of many vitamin and nutritional supplements, forms compounds that are not very soluble in water, and it has low toxicity. but cr ( vi ) is much more toxic and forms compounds that are reasonably soluble in water. exposure to s... | openstax_chemistry2e-web | [
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of each element. the name of the more metallic element ( the one farther to the left and / or bottom of the periodic table ) is first, followed by the name of the more nonmetallic element ( the one farther to the right and / or top ) with its ending changed to the suffix β ide. the numbers of atoms of each element are ... | openstax_chemistry2e-web | [
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2. 7 β’ chemical nomenclature 101 ( d ) p4o6 solution because these compounds consist solely of nonmetals, we use prefixes to designate the number of atoms of each element : ( a ) sulfur hexafluoride ( b ) dinitrogen trioxide ( c ) dichlorine heptoxide ( d ) tetraphosphorus hexoxide check your learning write the formula... | openstax_chemistry2e-web | [
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several other examples of this nomenclature are shown in table 2. 12. names of some simple acids name of gas name of acid hf ( g ), hydrogen fluoride hf ( aq ), hydrofluoric acid hcl ( g ), hydrogen chloride hcl ( aq ), hydrochloric acid table 2. 12 102 2 β’ atoms, molecules, and ions access for free at openstax. org na... | openstax_chemistry2e-web | [
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some exceptions to the general naming method ( e. g., h2so4 is called sulfuric acid, not sulfic acid, and h2so3 is sulfurous, not sulfous, acid ). names of common oxyacids formula anion name acid name hc2h3o2 acetate acetic acid hno3 nitrate nitric acid hno2 nitrite nitrous acid hclo4 perchlorate perchloric acid h2co3 ... | openstax_chemistry2e-web | [
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2. 7 β’ chemical nomenclature 103 key terms actinide inner transition metal in the bottom of the bottom two rows of the periodic table alkali metal element in group 1 alkaline earth metal element in group 2 alpha particle ( Ξ± particle ) positively charged particle consisting of two protons and two neutrons anion negativ... | openstax_chemistry2e-web | [
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crystals inert gas ( also, noble gas ) element in group 18 inner transition metal ( also, lanthanide or actinide ) element in the bottom two rows ; if in the first row, also called lanthanide, or if in the second row, also called actinide ion electrically charged atom or molecule ( contains unequal numbers of protons a... | openstax_chemistry2e-web | [
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single atom neutron uncharged, subatomic particle located in the nucleus noble gas ( also, inert gas ) element in group 18 nomenclature system of rules for naming objects 104 2 β’ key terms access for free at openstax. org of interest nonmetal element that appears dull, poor conductor of heat and electricity nucleus mas... | openstax_chemistry2e-web | [
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different elements can combine in fixed, small, whole - number ratios to form compounds. samples of a particular compound all have the same elemental proportions by mass. when two elements form different compounds, a given mass of one element will combine with masses of the other element in a small, whole - number rati... | openstax_chemistry2e-web | [
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2. 3 atomic structure and symbolism an atom consists of a small, positively charged nucleus surrounded by electrons. the nucleus contains protons and neutrons ; its diameter is about 100, 000 times smaller than that of the atom. the mass of one atom is usually expressed in atomic mass units ( amu ), which is referred t... | openstax_chemistry2e-web | [
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ratio of atoms in a compound. a structural formula indicates the bonding arrangement of the atoms in the molecule. ball - and - stick and space - filling models show the geometric arrangement of atoms in a molecule. isomers are compounds with the same molecular formula but different arrangements of atoms. | openstax_chemistry2e-web | [
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2. 5 the periodic table the discovery of the periodic recurrence of similar properties among the elements led to the formulation of the periodic table, in which the elements are arranged in order of increasing atomic number in rows known as periods and columns known as groups. elements in the same group of the periodic... | openstax_chemistry2e-web | [
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2. 6 ionic and molecular compounds metals ( particularly those in groups 1 and 2 ) tend to lose the number of electrons that would leave them with the same number of electrons as in the preceding noble gas in the periodic table. by this means, a positively charged ion is formed. similarly, nonmetals ( especially those ... | openstax_chemistry2e-web | [
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2. 7 chemical nomenclature chemists use nomenclature rules to clearly name compounds. ionic and molecular compounds are named using somewhat - different methods. binary ionic compounds typically consist of a metal and a nonmetal. the name of the metal is written first, followed by the name of the nonmetal with its endi... | openstax_chemistry2e-web | [
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2. 1 early ideas in atomic theory 1. in the following drawing, the green spheres represent atoms of a certain element. the purple spheres represent atoms of another element. if the spheres of different elements touch, they are part of a single unit of a compound. the following chemical change represented by these spher... | openstax_chemistry2e-web | [
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2. 2 evolution of atomic theory 5. the existence of isotopes violates one of the original ideas of dalton β s atomic theory. which one? 6. how are electrons and protons similar? how are they different? 7. how are protons and neutrons similar? how are they different? 8. predict and test the behavior of Ξ± particles fired... | openstax_chemistry2e-web | [
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) are fired at rutherford atoms, predict how their paths will differ from the lower - energy Ξ± particle paths. explain your reasoning. ( c ) predict how the paths taken by the Ξ± particles will differ if they are fired at rutherford atoms of elements other than gold. what factor do you expect to cause this difference in... | openstax_chemistry2e-web | [
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2. 3 atomic structure and symbolism 10. in what way are isotopes of a given element always different? in what way ( s ) are they always the same? 11. write the symbol for each of the following ions : ( a ) the ion with a 1 + charge, atomic number 55, and mass number 133 ( b ) the ion with 54 electrons, 53 protons, and ... | openstax_chemistry2e-web | [
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a stable atom of your element, and then do it and see if it works. explain your reasoning. 14. open the build an atom simulation ( http : / / openstax. org / l / 16phetatombld ). ( a ) drag protons, neutrons, and electrons onto the atom template to make a neutral atom of oxygen - 16 and give the isotope symbol for this... | openstax_chemistry2e-web | [
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number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes : ( a ) ( b ) ( c ) ( d ) ( e ) 19. give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes : ( a ) ( b ) ( c ) ( d ) ( e ) 20. click on the site ( http : / / openstax. org / l / ... | openstax_chemistry2e-web | [
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% abundance with 21. 99 amu. calculate the average atomic mass of this element. 23. average atomic masses listed by iupac are based on a study of experimental results. bromine has two isotopes, 79br and 81br, whose masses ( 78. 9183 and 80. 9163 amu, respectively ) and abundances ( 50. 69 % and 49. 31 %, respectively )... | openstax_chemistry2e-web | [
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atom? | openstax_chemistry2e-web | [
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2. 4 chemical formulas 27. explain why the symbol for an atom of the element oxygen and the formula for a molecule of oxygen differ. 28. explain why the symbol for the element sulfur and the formula for a molecule of sulfur differ. 29. write the molecular and empirical formulas of the following compounds : ( a ) ( b ) ... | openstax_chemistry2e-web | [
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change the connections. click on β 3d β to see the molecule, and look at both the space - filling and ball - and - stick possibilities. ( a ) draw the structural formula of this molecule and state its name. ( b ) can you arrange these atoms in any way to make a different compound? 35. use the build a molecule simulatio... | openstax_chemistry2e-web | [
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2. 5 the periodic table 37. using the periodic table, classify each of the following elements as a metal or a nonmetal, and then further classify each as a main - group ( representative ) element, transition metal, or inner transition metal : ( a ) uranium ( b ) bromine ( c ) strontium ( d ) neon ( e ) gold ( f ) ameri... | openstax_chemistry2e-web | [
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same period as the alkali metal with 11 protons ( b ) the alkaline earth metal in the same period with the neutral noble gas with 18 electrons ( c ) the noble gas in the same row as an isotope with 30 neutrons and 25 protons ( d ) the noble gas in the same period as gold 43. write a symbol for each of the following neu... | openstax_chemistry2e-web | [
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2. 6 ionic and molecular compounds 45. using the periodic table, predict whether the following chlorides are ionic or covalent : kcl, ncl3, icl, mgcl2, pcl5, and ccl4. 46. using the periodic table, predict whether the following chlorides are ionic or covalent : sicl4, pcl3, cacl2, cscl, cucl2, and crcl3. 47. for each o... | openstax_chemistry2e-web | [
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2. 7 chemical nomenclature 51. name the following compounds : ( a ) cscl ( b ) bao ( c ) k2s ( d ) becl2 ( e ) hbr ( f ) alf3 52. name the following compounds : ( a ) naf ( b ) rb2o ( c ) bcl3 ( d ) h2se ( e ) p4o6 ( f ) icl3 53. write the formulas of the following compounds : ( a ) rubidium bromide ( b ) magnesium sel... | openstax_chemistry2e-web | [
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( f ) mos2 58. each of the following compounds contains a metal that can exhibit more than one ionic charge. name these compounds : ( a ) nico3 ( b ) moo3 ( c ) co ( no3 ) 2 ( d ) v2o5 ( e ) mno2 ( f ) fe2o3 59. the following ionic compounds are found in common household products. write the formulas for each compound :... | openstax_chemistry2e-web | [
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3. 4 other units for solution concentrations swimming pools have long been a popular means of recreation, exercise, and physical therapy. since it is impractical to refill large pools with fresh water on a frequent basis, pool water is regularly treated with chemicals to prevent the growth of harmful bacteria and algae... | openstax_chemistry2e-web | [
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3. 1 formula mass and the mole concept learning objectives by the end of this section, you will be able to : β’ calculate formula masses for covalent and ionic compounds β’ define the amount unit mole and the related quantity avogadro β s number explain the relation between mass, moles, and numbers of atoms or molecules,... | openstax_chemistry2e-web | [
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calculations used to derive the molecular mass of chloroform, which is 119. 37 amu. figure 3. 2 the average mass of a chloroform molecule, chcl3, is 119. 37 amu, which is the sum of the average atomic masses of each of its constituent atoms. the model shows the molecular structure of chloroform. likewise, the molecular... | openstax_chemistry2e-web | [
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151. 16 amu formula mass for ionic compounds ionic compounds are composed of discrete cations and anions combined in ratios to yield electrically neutral bulk matter. the formula mass for an ionic compound is calculated in the same way as the formula mass for covalent compounds : by summing the average atomic masses of... | openstax_chemistry2e-web | [
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-0.0021107038483023643,
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3. 1 β’ formula mass and the mole concept 119 figure 3. 4 table salt, nacl, contains an array of sodium and chloride ions combined in a 1 : 1 ratio. its formula mass is 58. 44 amu. note that the average masses of neutral sodium and chlorine atoms were used in this computation, rather than the masses for sodium cations a... | openstax_chemistry2e-web | [
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a common anti - caking agent added to food products. what is the formula mass ( amu ) of calcium phosphate? answer : | openstax_chemistry2e-web | [
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310. 18 amu the mole the identity of a substance is defined not only by the types of atoms or ions it contains, but by the quantity of each type of atom or ion. for example, water, h2o, and hydrogen peroxide, h2o2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. however, because ... | openstax_chemistry2e-web | [
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##ly rounded version being 6. 022 1023 / mol. consistent with its definition as an amount unit, 1 mole of any element contains the same number of atoms as 1 mole of any other element. the masses of 1 mole of different elements, however, are different, since the masses of the individual atoms are drastically different. ... | openstax_chemistry2e-web | [
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3. 1 β’ formula mass and the mole concept 121 figure 3. 6 each sample contains 6. 02 1023 molecules or formula units β 1. 00 mol of the compound or element. clock - wise from the upper left : 130. 2 g of c8h17oh ( 1 - octanol, formula mass 130. 2 amu ), 454. 4 g of hgi2 ( mercury ( ii ) iodide, formula mass 454. 4 amu )... | openstax_chemistry2e-web | [
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6. 022 1023 while atomic mass and molar mass are numerically equivalent, keep in mind that they are vastly different in terms of scale, as represented by the vast difference in the magnitudes of their respective units ( amu versus g ). to appreciate the enormity of the mole, consider a small drop of water weighing abou... | openstax_chemistry2e-web | [
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the periodic table, the atomic mass of k is 39. 10 amu, and so its molar mass is 39. 10 g / mol. the given mass of k ( 4. 7 g ) is a bit more than one - tenth the molar mass ( 39. 10 g ), so a reasonable β ballpark β estimate of the number of moles would be slightly greater than 0. 1 mol. the molar amount of a substanc... | openstax_chemistry2e-web | [
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0. 360 mol example 3. 4 deriving grams from moles for an element a liter of air contains 9. 2 10β4 mol argon. what is the mass of ar in a liter of air? solution the molar amount of ar is provided and must be used to derive the corresponding mass in grams. since the amount of ar is less than 1 mole, the mass will be les... | openstax_chemistry2e-web | [
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504. 4 g example 3. 5 deriving number of atoms from mass for an element copper is commonly used to fabricate electrical wire ( figure 3. 8 ). how many copper atoms are in 5. 00 g of copper wire? 124 3 β’ composition of substances and solutions access for free at openstax. org figure 3. 8 copper wire is composed of many,... | openstax_chemistry2e-web | [
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3. 1 β’ formula mass and the mole concept 125 the molar mass of glycine is required for this calculation, and it is computed in the same fashion as its molecular mass. one mole of glycine, c2h5o2n, contains 2 moles of carbon, 5 moles of hydrogen, 2 moles of oxygen, and 1 mole of nitrogen : the provided mass of glycine (... | openstax_chemistry2e-web | [
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0. 073 mol example 3. 7 deriving grams from moles for a compound vitamin c is a covalent compound with the molecular formula c6h8o6. the recommended daily dietary allowance of vitamin c for children aged 4 β 8 years is 1. 42 10β4 mol. what is the mass of this allowance in grams? solution as for elements, the mass of a ... | openstax_chemistry2e-web | [
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14. 2 g example 3. 8 deriving the number of atoms and molecules from the mass of a compound a packet of an artificial sweetener contains 40. 0 mg of saccharin ( c7h5no3s ), which has the structural formula : given that saccharin has a molar mass of 183. 18 g / mol, how many saccharin molecules are in a 40. 0 - mg ( 0. ... | openstax_chemistry2e-web | [
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3. 1 β’ formula mass and the mole concept 127 how sciences interconnect counting neurotransmitter molecules in the brain the brain is the control center of the central nervous system ( figure 3. 9 ). it sends and receives signals to and from muscles and other internal organs to monitor and control their functions ; it p... | openstax_chemistry2e-web | [
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##nsmitter that has been very extensively studied is dopamine, c8h11no2. dopamine is involved in various neurological processes that impact a wide variety of human behaviors. dysfunctions in the dopamine systems of the brain underlie serious neurological diseases such as parkinson β s and schizophrenia. figure 3. 10 ( ... | openstax_chemistry2e-web | [
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##mol ). analysis of these neurons from mice subjected to various drug therapies shows significant changes in the average number of dopamine molecules contained in individual vesicles, increasing or decreasing by up to three - fold, depending on the specific drug used. these studies also indicate that not all of the do... | openstax_chemistry2e-web | [
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3. 2 determining empirical and molecular formulas learning objectives by the end of this section, you will be able to : β’ compute the percent composition of a compound β’ determine the empirical formula of a compound β’ determine the molecular formula of a compound the previous section discussed the relationship between ... | openstax_chemistry2e-web | [
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srep01447. | openstax_chemistry2e-web | [
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3. 2 β’ determining empirical and molecular formulas 129 example 3. 9 calculation of percent composition analysis of a 12. 04 - g sample of a liquid compound composed of carbon, hydrogen, and nitrogen showed it to contain 7. 34 g c, 1. 85 g h, and 2. 85 g n. what is the percent composition of this compound? solution to ... | openstax_chemistry2e-web | [
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1. 008 amu ) = 3. 024 amu. the formula mass of ammonia is therefore ( 14. 01 amu + 3. 024 amu ) = 17. 03 amu, and its percent composition is : this same approach may be taken considering a pair of molecules, a dozen molecules, or a mole of molecules, etc. the latter amount is most convenient and would simply involve th... | openstax_chemistry2e-web | [
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accomplished using molar masses to convert the mass of each element to a number of moles. these molar amounts are used to compute whole - number ratios that can be used to derive the empirical formula of the substance. consider a sample of compound determined to contain 1. 71 g c and 0. 287 g h. the corresponding numbe... | openstax_chemistry2e-web | [
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3. 2 β’ determining empirical and molecular formulas 131 as well ; however, additional information is needed to make that determination ( as discussed later in this section ). consider as another example a sample of compound determined to contain 5. 31 g cl and 8. 40 g o. following the same approach yields a tentative e... | openstax_chemistry2e-web | [
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- to - oxygen molar ratio by dividing by the lesser number of moles : the ratio is 1. 000 mol of iron to 1. 500 mol of oxygen ( fe1o1. 5 ). finally, multiply the ratio by two to get the smallest possible whole number subscripts while still maintaining the correct iron - to - oxygen ratio : the empirical formula is fe2o... | openstax_chemistry2e-web | [
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3. 2 β’ determining empirical and molecular formulas 133 figure 3. 13 an oxide of carbon is removed from these fermentation tanks through the large copper pipes at the top. ( credit : β dual freq β / wikimedia commons ) solution since the scale for percentages is 100, it is most convenient to calculate the mass of eleme... | openstax_chemistry2e-web | [
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measured by a number of experimental methods, many of which will be introduced in later chapters of this text. molecular formulas are derived by comparing the compound β s molecular or molar mass to its empirical formula mass. as the name suggests, an empirical formula mass is the sum of the average atomic masses of al... | openstax_chemistry2e-web | [
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the molecular formula? solution determining the molecular formula from the provided data will require comparison of the compound β s empirical formula mass to its molar mass. as the first step, use the percent composition to derive the compound β s empirical formula. assuming a convenient, a 100 - g sample of nicotine ... | openstax_chemistry2e-web | [
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3. 2 β’ determining empirical and molecular formulas 135 next, calculate the molar ratios of these elements relative to the least abundant element, n. the c - to - n and h - to - n molar ratios are adequately close to whole numbers, and so the empirical formula is c5h7n. the empirical formula mass for this compound is t... | openstax_chemistry2e-web | [
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... |
3. 3 molarity learning objectives by the end of this section, you will be able to : β’ describe the fundamental properties of solutions β’ calculate solution concentrations using molarity β’ perform dilution calculations using the dilution equation preceding sections of this chapter focused on the composition of substance... | openstax_chemistry2e-web | [
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a given solution component is known as its concentration. often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. this component is called the solvent and may be viewed as the medium in which the other components are dispersed, or... | openstax_chemistry2e-web | [
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0. 05 m example 3. 15 deriving moles and volumes from molar concentrations how much sugar ( mol ) is contained in a modest sip ( ~ 10 ml ) of the soft drink from example 3. 14? solution rearrange the definition of molarity to isolate the quantity sought, moles of sugar, then substitute the value for molarity derived in... | openstax_chemistry2e-web | [
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solution the volume and molarity of the solution are specified, so the amount ( mol ) of solute is easily computed as demonstrated in example 3. 15 : 3. 3 β’ molarity 139 finally, this molar amount is used to derive the mass of nacl : check your learning how many grams of cacl2 ( 110. 98 g / mol ) are contained in 250. ... | openstax_chemistry2e-web | [
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5. 55 g cacl2 when performing calculations stepwise, as in example 3. 17, it is important to refrain from rounding any intermediate calculation results, which can lead to rounding errors in the final result. in example 3. 17, the molar amount of nacl computed in the first step, 1. 325 mol, would be properly rounded to ... | openstax_chemistry2e-web | [
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... |
0. 370 l dilution of solutions dilution is the process whereby the concentration of a solution is lessened by the addition of solvent. for example, a glass of iced tea becomes increasingly diluted as the ice melts. the water from the melting ice increases the volume of the solvent ( water ) and the overall volume of th... | openstax_chemistry2e-web | [
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0.012819871306419373,
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0.0... |
is commonly referred to as the dilution equation. although this equation uses molarity as the unit of concentration and liters as the unit of volume, other units of concentration and volume may be used as long as the units properly cancel per the factor - label method. reflecting this versatility, the dilution equation... | openstax_chemistry2e-web | [
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-0... |
3. 3 β’ molarity 141 link to learning use the simulation ( http : / / openstax. org / l / 16phetsolvents ) to explore the relations between solute amount, solution volume, and concentration and to confirm the dilution equation. example 3. 19 determining the concentration of a diluted solution if 0. 850 l of a 5. 00 - m ... | openstax_chemistry2e-web | [
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0.05815361440181732,
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0.031876906752586365,
-0.014711454510688782,
0.01... |
0. 102 m ch3oh example 3. 20 volume of a diluted solution what volume of 0. 12 m hbr can be prepared from 11 ml ( 0. 011 l ) of 0. 45 m hbr? solution provided are the volume and concentration of a stock solution, v1 and c1, and the concentration of the resultant diluted solution, c2. find the volume of the diluted solu... | openstax_chemistry2e-web | [
0.019411681219935417,
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0.05843973532319069,
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0.01... |
3. 76 l example 3. 21 volume of a concentrated solution needed for dilution what volume of 1. 59 m koh is required to prepare 5. 00 l of 0. 100 m koh? solution given are the concentration of a stock solution, c1, and the volume and concentration of the resultant diluted solution, v2 and c2. find the volume of the stock... | openstax_chemistry2e-web | [
0.042487382888793945,
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0.06646118313074112,
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3. 4 other units for solution concentrations learning objectives by the end of this section, you will be able to : β’ define the concentration units of mass percentage, volume percentage, mass - volume percentage, parts - per - million ( ppm ), and parts - per - billion ( ppb ) β’ perform computations relating a solution... | openstax_chemistry2e-web | [
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0.021952299401164055,
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-... |
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