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Math | Question: 423
For the following two-way table, compute the value of Ï2.
| 1 | [
"1.45",
"4.167",
"5.2",
"5.55",
"None of the above"
] | |||||||||
Math | Question: 424
A toy company published an advertisement in the local newspaper of a major city and in a children's magazine to see which medium generated more advertising viewership. A random sample of families was taken, and each family was asked to indicate where they had seen the product's advertisement. The results ... | 0 | [
"3",
"4",
"7",
"8",
"None of the above"
] | |||||||||
Math | Question: 425
A physical education teacher at a middle school wanted to observe whether there was any association between the weight of a male student and how much weight he could lift. The following data were collected, and a chi-square test was performed. The output indicated a test statistic of 1.745 and a p-value o... | 3 | [
"Since the value of the test statistic is so small, there is a significant relationship between the weight of an individual and the weight he can lift.",
"The correlation coefficient from a linear regression analysis for these data would be less than 0.20.",
"It is not possible to run a chi-square test on these... | |||||||||
Math | Question: 426
A small college is expecting that the ratio of students that will pass compared to those that will fail will be 3 to 1. The college has 880 students. Despite these expectations, 639 students passed, while 241 failed. What is the correct chi-square statistic?
| 2 | [
"0.669",
"1.52",
"2.67",
"3.152",
"4.237"
] | |||||||||
Math | Question: 431
A recent study of accident records at a large engineering company in Europe reported the following number of injuries in each shift for one year.
Is there sufficient evidence to say that the number of accidents during the three shifts are not the same? Test at the 0.05, 0.01, and 0.001 levels.
| 0 | [
"There is sufficient evidence at all three levels to say that the number of accidents during each shift are not the same.",
"There is sufficient evidence at both 0.05 and 0.01 levels but not at the 0.001 level.",
"There is sufficient evidence at the 0.05 level but not at the 0.01 and 0.001 levels.",
"There is... | |||||||||
Math | Question: 432
A farm is expecting to have chickens hatched, where there will be an equal number of yellow, white, and mixed-color chickens. Despite these expectations, of the 900 chickens that were hatched, 276 of them were yellow, 294 of them were white, and 330 were mixed color. Which of the following is the correct ... | 3 | [
"1.47",
"2.85",
"3.92",
"5.04",
"6.18"
] | |||||||||
Math | Question: 433
A teacher at a community college is expecting that 10% of her class will get an A on their exam, 15% will get a B, 35% will get a C, 25% will get a D, while 15% will get an F. All of the students participated in the exam. The actual values were that 22 students got an A, 18 got a B, 25 got a C, 15 got a D... | 4 | [
"1.92",
"5.47",
"17.25",
"21.24",
"23.52"
] | |||||||||
Math | Question: 434
A building inspector inspects four major construction sites every day. In a sample of 100 days, the number of times each site passed inspection is shown in this chart.
Test the hypothesis that Sites C and D pass inspection twice as often as Sites A and B; that is, that the frequency of passing inspecti... | 3 | [
"There is sufficient evidence at both the 10% and 5% significance levels that there is not a good fit with the indicated ratio.",
"There is sufficient evidence at the 10% level, but not at the 5% level, that there is not a good fit with the indicated ratio.",
"There is sufficient evidence at the 5% level, but n... | |||||||||
Math | Question: 437
A school class is going on a class trip, and a vote is being taken of where the class wants to go. The school expects that half of the students would want to go to Disney World, while the other half would want to go to visit Washington, DC Despite these expectations, only 42 students wanted to go to Washi... | 2 | [
"4.1",
"7",
"14",
"17.4",
"22"
] | |||||||||
Math | Question: 441
A company decides to finance a trip as part of a team-building activity for its employees. All 135 employees could decide on whichever location they would visit, and the company expected that the same number of people would go to each of these locations. Despite this expectation, 43 people went to Paris, ... | 2 | [
"3.62",
"5.18",
"7.64",
"9.18",
"11.31"
] | |||||||||
Math | Question: 447
Using the given contingency table, determine whether there is evidence that the type of vote is dependent on gender at the 5% level.
| 3 | [
"The null hypothesis is rejected, which implies there is evidence that the type of vote is dependent on gender.",
"The null hypothesis is not rejected, which implies there is evidence that the type of vote is dependent on gender.",
"The null hypothesis is rejected, which implies that there is no evidence that t... | |||||||||
Math | Question: 449
Given the contingency table below, determine the expected frequency of cell 1, 3.
| 3 | [
"83.7",
"85",
"115",
"116.7",
"899"
] | |||||||||
Chemistry | Based on the strength of the intermolecular forces in each substance, estimate from greatest to smallest the vapor pressures of each substance in liquid state at the same temperature.
| 1 | [
"propane > ethanal > ethene > methanol",
"ethene > propane > ethanal > methanol",
"ethanal > methanol > ethene > propane",
"methanol > ethanal > propane > ethene"
] | |||||||||
Chemistry | When in liquid state, which two substances are most likely to be miscible with water?
| 3 | [
"propane and ethene",
"methanol and propane",
"ethene and ethanal",
"methanol and ethanal"
] | |||||||||
Chemistry | Between propane and ethene, which will likely have the higher boiling point and why?
| 1 | [
"propane, because it has a greater molar mass",
"propane, because it has a more polarizable electron cloud",
"ethene, because of the double bond",
"ethene, because it is smaller in size"
] | |||||||||
Chemistry | The graph below shows the amount of potential energy between two hydrogen atoms as the distance between them changes. At which point in the graph would a molecule of $H_2$ be the most stable?
| 2 | [
"Point A",
"Point B",
"Point C",
"Point D"
] | |||||||||
Chemistry | Two alloys are shown in the diagrams below—bronze, and steel. Which of the following correctly describes the malleability of both alloys compared to their primary metals?
| 2 | [
"Bronze's malleability would be comparable to that of copper, but steel's malleability would be significantly lower than that of iron.",
"Bronze's malleability would be significantly higher than that of copper, but steel's malleability would be comparable to that of iron.",
"Both bronze and steel would have mal... | |||||||||
Chemistry | The following diagram shows the relative atomic sizes of three different elements from the same period. Which of the following statements must be true?
| 3 | [
"The effective nuclear charge would be the greatest in element X.",
"The first ionization energy will be greatest in element X.",
"The electron shielding effect will be greatest in element Z.",
"The electronegativity value will be greatest in element Z."
] | |||||||||
Chemistry | Two half-cells are set up as follows:
Half-Cell A: Strip of Cu(s) in $CuNO_3(aq)$
Half-Cell B: Strip of Zn(s) in $Zn(NO_3)_2(aq)$
When the cells are connected according to the following diagram, the following reaction occurs. Correctly identify the anode and cathode in this reaction as well as where oxidation and re... | 2 | [
"Cu is the anode where oxidation occurs, and Zn is the cathode where reduction occurs.",
"Cu is the anode where reduction occurs, and Zn is the cathode where oxidation occurs. \b C. Zn is the anode where oxidation occurs, and Cu is the cathode where reduction occurs.",
"Zn is the anode where reduction occurs, a... | |||||||||
Chemistry | Two half-cells are set up as follows:
Half-Cell A: Strip of Cu(s) in $CuNO_3(aq)$
Half-Cell B: Strip of Zn(s) in $Zn(NO_3)_2(aq)$
When the cells are connected according to the following diagram, the following reaction occurs. How many moles of electrons must be transferred to create 127 g of copper?
| 1 | [
"1 mole of electrons",
"2 moles of electrons",
"3 moles of electrons",
"4 moles of electrons"
] | |||||||||
Chemistry | Two half-cells are set up as follows:
Half-Cell A: Strip of Cu(s) in $CuNO_3(aq)$
Half-Cell B: Strip of Zn(s) in $Zn(NO_3)_2(aq)$
When the cells are connected according to the following diagram, the following reaction occurs. If the $Cu^+ + e^- → Cu(s)$ half reaction has a standard reduction potential of +0.52 V, wh... | 1 | [
"+0.76 V",
"-0.76 V",
"+0.24 V",
"-0.24 V"
] | |||||||||
Chemistry | Two half-cells are set up as follows:
Half-Cell A: Strip of Cu(s) in $CuNO_3(aq)$
Half-Cell B: Strip of Zn(s) in $Zn(NO_3)_2(aq)$
When the cells are connected according to the following diagram, the following reaction occurs. As the reaction progresses, what will happen to the overall voltage of the cell?
| 2 | [
"It will increase as [$Zn^{2+}$] increases.",
"It will increase as [$Cu^{+}$] increases.",
"It will decrease as [$Zn^{2+}$] increases.",
"The voltage will remain constant."
] | |||||||||
Chemistry | Two half-cells are set up as follows:
Half-Cell A: Strip of Cu(s) in $CuNO_3(aq)$
Half-Cell B: Strip of Zn(s) in $Zn(NO_3)_2(aq)$
When the cells are connected according to the following diagram, the following reaction occurs. What will happen in the salt bridge as the reaction progresses?
| 0 | [
"The Na+ ions will flow to the Cu/Cu+ half-cell.",
"The Br- ions will flow to the Cu/Cu+ half-cell.",
"Electrons will transfer from the Cu/Cu+ half-cell to the Zn/Zn2+ half-cell.",
"Electrons will transfer from the Zn/Zn2+ half-cell to the Cu/Cu+ half-cell."
] | |||||||||
Chemistry | A solution of carbonic acid, $H_2CO_3$, is titrated with sodium hydroxide, NaOH. The following graph is produced. In addition to $OH^-$, what species are present in the solution during section III of the graph?
| 2 | [
"$H_2CO_3$, $HCO_3^-$, and $CO_3^{2-}$",
"$H_2CO_3$ and $HCO_3^-$",
"$HCO_3^-$ and $CO_3^{2-}$",
"$H_2CO_3$ and $CO_3^{2-}$"
] | |||||||||
Chemistry | A solution of carbonic acid, H2CO3, is titrated with sodium hydroxide, NaOH. The following graph is produced. What is the magnitude of the first dissociation constant?
| 2 | [
"10e-2",
"10e-4",
"10e-6",
"10e-8"
] | |||||||||
Chemistry | A solution of carbonic acid, H2CO3, is titrated with sodium hydroxide, NaOH. The following graph is produced. If the concentration of the sodium hydroxide is increased prior to repeating the titration, what effect, if any, would that have on the graph?
| 2 | [
"The graph would not change at all.",
"The pH values at the equivalence points would increase.",
"The equivalence points would be reached with less volume of NaOH added.",
"The slope of the equivalence points would decrease."
] | |||||||||
Chemistry | Two solutions of potassium carbonate and sodium chloride are mixed together, and the particulate representation below shows what is present after the reaction has gone to completion. Which of the two original solutions is the limiting reagent and why?
| 1 | [
"The potassium carbonate, because of the polyatomic anion",
"The potassium carbonate, because there is no carbonate left after the reaction",
"The calcium chloride, because there is an excess of calcium ions post-reaction",
"The calcium chloride, because the component ions are smaller than those in potassium ... | |||||||||
Chemistry | The structure of two oxoacids is shown below. Which would be a stronger acid, and why?
| 3 | [
"HOCl, because the H–O bond is weaker than in HOF as chlorine is larger than fluorine",
"HOCl, because the H–O bond is stronger than in HOF as chlorine has a higher electronegativity than fluorine",
"HOF, because the H–O bond is stronger than in HOCl as fluorine has a higher electronegativity than chlorine",
... | |||||||||
Chemistry | The following diagrams show the Lewis structures of four different molecules. Which molecule would travel the farthest in a paper chromatography experiment using a polar solvent?
| 0 | [
"Methanol",
"Pentane",
"Acetone",
"Ether"
] | |||||||||
Chemistry | Four different acids are added to beakers of water, and the following diagrams represent the species present in each solution at equilibrium. Which acid has the highest pH?
| 2 | [
"Acid 1",
"Acid 2",
"Acid 3",
"Acid 4"
] | |||||||||
Chemistry | Lewis diagrams for the nitrate and nitrite ions are shown below. Choose the statement that correctly describes the relationship between the two ions in terms of bond length and bond energy.
| 2 | [
"Nitrite has longer and stronger bonds than nitrate.",
"Nitrite has longer and weaker bonds than nitrate.",
"Nitrite has shorter and stronger bonds than nitrate.",
"Nitrite has shorter and weaker bonds than nitrate."
] | |||||||||
Chemistry | $NO_2$ gas is placed in a sealed, evacuated container and allowed to decompose via the following equation:
$2NO_2(g) ↔ 2NO(g) + O_2(g)$
The graph below indicates the change in concentration for each species over time. What is happening to the rate of the forward reaction at t = 60 s?
| 2 | [
"It is increasing.",
"It is decreasing.",
"It is remaining constant.",
"It is zero."
] | |||||||||
Chemistry | $NO_2$ gas is placed in a sealed, evacuated container and allowed to decompose via the following equation:
$2NO_2(g) ↔ 2NO(g) + O_2(g)$
The graph below indicates the change in concentration for each species over time. As the reaction progresses, what happens to the value of the equilibrium constant Kp if the temperat... | 0 | [
"It stays constant.",
"It increases exponentially.",
"It increases linearly.",
"It decreases exponentially."
] | |||||||||
Chemistry | $NO_2$ gas is placed in a sealed, evacuated container and allowed to decompose via the following equation:
$2NO_2(g) ↔ 2NO(g) + O_2(g)$
The graph below indicates the change in concentration for each species over time. What would happen to the slope of the $NO_2$ line if additional $O_2$ were injected into the contain... | 0 | [
"It would increase, then level off.",
"It would decrease, then level off.",
"It would remain constant.",
"It would increase, then decrease."
] | |||||||||
Chemistry | $NO_2$ gas is placed in a sealed, evacuated container and allowed to decompose via the following equation:
$2NO_2(g) ↔ 2NO(g) + O_2(g)$
The graph below indicates the change in concentration for each species over time. Using the graph, how could you determine the instantaneous rate of disappearance of $NO_2$ at t = 30... | 1 | [
"By determining the area under the graph at t = 30 s",
"By taking the slope of a line tangent to the $NO_2$curve at t = 30 s",
"By using the values at t = 30 s and plugging them into the Kp expression",
"By measuring the overall gas pressure in the container at t = 30 s."
] | |||||||||
Chemistry | The reaction shown in the following diagram is accompanied by a large increase in temperature. If all molecules shown are in their gaseous state, which statement accurately describes the reaction?
| 0 | [
"It is an exothermic reaction in which entropy increases.",
"It is an exothermic reaction in which entropy decreases.",
"It is an endothermic reaction in which entropy increases.",
"It is an endothermic reaction in which entropy decreases."
] | |||||||||
Chemistry | The contents in the three containers on the left in the diagram above are transferred to the container on the right. The volumes of the original containers are exactly the values indicated. The pressure in the first three containers is 1.0 atm. What is the pressure in the container on the right?
| 2 | [
"3.0 atm",
"4.0 atm",
"1.1 atm",
"0.50 atm"
] | |||||||||
Chemistry | The diagram above shows the structure of molecules of CS2 and COS. The boiling point of COS is 223 K, and the boiling point of CS2 is 319 K. Which of the following is the best explanation of why the boiling point of CS2 is higher?
| 0 | [
"The molar mass of CS2 is greater.",
"COS has weaker covalent bonds than CS2.",
"Only CS2 can form intermolecular dipole-dipole forces.",
"COS has stronger intermolecular forces because it is polar and CS2 is not."
] | |||||||||
Chemistry | Which of the following best explains why the boiling point of 2-propanol is lower than the other two compounds in the diagram and table above?
| 2 | [
"Larger molecules get tangled and cannot escape each other.",
"It has weaker hydrogen bonds.",
"It is the lightest of the three.",
"It is a more symmetrical molecule."
] | |||||||||
Chemistry | The Dumas method is a procedure for determining the molar mass of a gas. In this procedure the mass of a gas is divided by the moles of gas determined from the ideal gas equation (n = PV/RT). The molar masses of some compounds, such as acetic acid, illustrated above, show significant deviations from the “correct” value... | 3 | [
"Acetic acid, like all acids, will lose a hydrogen ion, so the molar mass is that of the acetate ion, which is less than that of acetic acid.",
"Acetic acid is a liquid at room temperature, and its boiling point is too high to get accurate results.",
"Acids are too reactive to give accurate results.",
"The pr... | |||||||||
Chemistry | Which of the labeled arrows in the diagram above represents the strongest intermolecular force?
| 1 | [
"A",
"B",
"C",
"D"
] | |||||||||
Chemistry | pH versus volume of titrant added
The diagram above represents the idealized titration curve for the reaction of pure sodium carbonate, Na2CO3, with a strong acid such as hydrochloric acid, HCl. E and F represent the pH at the endpoints corresponding to the formation of HCO3- and H2CO3, respectively. G and H correspond... | 0 | [
"They are the same.",
"It takes more to reach point G.",
"It takes more to get from G to H.",
"It is impossible to determine"
] | |||||||||
Chemistry | pH versus volume of titrant added
The diagram above represents the idealized titration curve for the reaction of pure sodium carbonate, Na2CO3, with a strong acid such as hydrochloric acid, HCl. E and F represent the pH at the endpoints corresponding to the formation of HCO3- and H2CO3, respectively. G and H correspond... | 2 | [
"It takes more to get from G to H.",
"It takes more to reach point G.",
"They are the same.",
"It is impossible to determine."
] | |||||||||
Chemistry | pH versus volume of titrant added
The diagram above represents the idealized titration curve for the reaction of pure sodium carbonate, Na2CO3, with a strong acid such as hydrochloric acid, HCl. E and F represent the pH at the endpoints corresponding to the formation of HCO3- and H2CO3, respectively. G and H correspond... | 2 | [
"The presence of an acid contaminant would require less acid to reach H from G than to reach G from 0.",
"The presence of a base contaminant would require less acid to reach G from 0 than to reach F from G.",
"The presence of a base contaminant would require more acid to reach G from 0 than to reach F from G.",... | |||||||||
Chemistry | pH versus volume of titrant added
The diagram above represents the idealized titration curve for the reaction of pure sodium carbonate, Na2CO3, with a strong acid such as hydrochloric acid, HCl. E and F represent the pH at the endpoints corresponding to the formation of HCO3- and H2CO3, respectively. G and H correspond... | 1 | [
"$\\ch{Na2CO3}$ and $\\ch{HCl}$",
"$\\ch{Na+}$, $\\ch{Cl-}$, and $\\ch{H2CO3}$",
"$\\ch{HCO3-}$ and $\\ch{H+}$",
"$ \\ch{Na+}$, $\\ch{Cl-}$, $\\ch{H+}$, and $\\ch{CO3^{2-}}$"
] | |||||||||
Chemistry | pH versus volume of titrant added
The diagram above represents the idealized titration curve for the reaction of pure sodium carbonate, Na2CO3, with a strong acid such as hydrochloric acid, HCl. E and F represent the pH at the endpoints corresponding to the formation of HCO3- and H2CO3, respectively. G and H correspond... | 3 | [
"At point G",
"Halfway between the start and point G",
"At point H",
"Halfway between points G and H"
] | |||||||||
Chemistry | What is the reason that the lightest member of Group 15 does not follow the trend of the other members, which show that the boiling point decreases with decreasing atomic mass of the Group 15 element?
The graph shows the variation of boiling point with Group number for the hydrogen compounds of the four lightest member... | 3 | [
"Ionic bonds",
"Hybrid orbitals",
"Resonance structures",
"Hydrogen bonding"
] | |||||||||
Chemistry | A dimer consists of two closely associated molecules. In the gas phase, acetic acid tends to form dimers as illustrated on the left in the above diagram. Acetyl chloride, on the right in the above diagram, is not very efficient in forming dimers. Why is acetic acid better able to form dimers than acetyl chloride?
| 2 | [
"The molecular mass of acetyl chloride is higher than that of acetic acid making it harder for the acetyl chloride to form dimers.",
"It is easier to form a covalent bond between acetic acid molecules than between acetyl chloride molecules.",
"Acetic acid can form strong hydrogen bonds but acetyl chloride can o... | |||||||||
Chemistry | Two compounds with the formula C2H2Cl2 appear in the above diagram. These two compounds are isomers. The molecules are planar and have the approximate structures shown in the diagram. The boiling point of trans-1, 2-dichloroethene is 47.5°C and the boiling point of cis-1,2-dichloroethene is 60.3°C. Which of the followi... | 0 | [
"The higher boiling isomer is more polar than the other isomer.",
"The higher boiling isomer is better able to form hydrogen bonds than the other isomer.",
"The higher boiling isomer has a greater molar mass.",
"The higher boiling isomer has greater London dispersion forces than the other isomer."
] | |||||||||
Chemistry | Use the following information on the bases in the following diagram to answer questions.
https://img.crackap.com/ap/chemistry/a5/Image00543.jpg
Ammonia is only present as a reference. Questions only refer to the other three bases.
https://img.crackap.com/ap/chemistry/a5/Image00544.jpg
All the bases in the diagram beh... | 0 | [
"A hydrogen ion attaches to the lone pair on the nitrogen atom.",
"The hydroxide ion reacts with the hydrogen ion to form water.",
"The hydrogen ion forms a hydrogen bond to the base.",
"The hydrogen ion combines with a hydrogen atom from the base to form H2 gas"
] | |||||||||
Chemistry | Use the following information on the bases in the following diagram to answer questions.
https://img.crackap.com/ap/chemistry/a5/Image00543.jpg
Ammonia is only present as a reference. Questions only refer to the other three bases.
https://img.crackap.com/ap/chemistry/a5/Image00544.jpg
Which of the following explains ... | 2 | [
"The $-OH$ is capable of donating a hydrogen ion, which will lower the pH.",
"The presence of carbon makes the bases less stable.",
"The presence of the very electronegative oxygen inhibits the nitrogen atom from donating its electron pair.",
"There is insufficient information to explain this observation."
] | |||||||||
Chemistry | Which of the compounds in the above diagram is capable of participating in hydrogen bonding?
| 3 | [
"$C_3H_9N$",
"$CH_3F$",
"$C_2H_6O$",
"$C_4H_11$"
] | |||||||||
Chemistry | Ammonia is the best-known nitrogen-hydrogen compound; however, there are a number of other nitrogen-hydrogen compounds, three of which are in the above diagram. Which of these has the longest average N-N bond length?
| 2 | [
"$N_2H_2$",
"$N_3H_3$",
"$N_4H_4$",
"They are all the same."
] | |||||||||
Chemistry | Use the information on the acids in the following diagram to answer questions.
Sample solutions of each of the three acids were titrated with 0.10 M sodium hydroxide, NaOH. Each of the acid solutions had a concentration of 0.10 M. Which of the acid titrations had the highest pH at the endpoint?
| 1 | [
"Formic acid",
"Benzoic acid",
"Chloroacetic acid",
"They all had a pH of 7 at the endpoint."
] | |||||||||
Chemistry | Use the information on the acids in the following diagram to answer questions.
A student prepares three buffer solutions. Each solution is 1.0 M in one of the acids in the table and 1.0 M in its corresponding sodium salt. Which of the solutions has the greatest buffer capacity with respect to added NaOH and why?
| 3 | [
"The benzoic acid buffer because it is the strongest acid.",
"The chloroacetic acid buffer because it is the strongest acid.",
"The formic acid buffer because it donate both of its hydrogen atoms.",
"All are the same."
] | |||||||||
Chemistry | Cyclopropane, pictured above, is a relatively unstable compound. As seen in the diagram, the carbon atoms form the corners of an equilateral triangle and each carbon atom has two hydrogen atoms attached to complete an octet of electrons around the carbon atoms. Based upon this structure, why is cyclopropane a relativel... | 2 | [
"Hydrocarbon compounds are relatively unstable in general.",
"Compounds that have identical atoms bonded to each other are relatively unstable.",
"The bonds do not match the angles.",
"There is no resonance to stabilize the compound."
] | |||||||||
Chemistry | Refer to the following information.
$N_2O_4(g)\rightleftarrows 2NO_2(g)$
$N_2O_4(g)$ decomposes into $NO_2(g)$ according to the equation above. A pure sample of $N_2O_4(g)$ is placed into a rigid, evacuated, 0.500 L container. The initial pressure of the $N_2O_4(g)$ is 760 atm. The temperature is held constant until ... | 3 | [
"The intermolecular attractions inside the container decrease, so the molecules strike the walls more frequently.",
"The intermolecular attractions inside the container increase, which increases the force as molecules collide with the walls of the container.",
"The average kinetic energy increases as the reacti... | |||||||||
Chemistry | Refer to the following information.
$N_2O_4(g)\rightleftarrows 2NO_2(g)$
$N_2O_4(g)$ decomposes into $NO_2(g)$ according to the equation above. A pure sample of $N_2O_4(g)$ is placed into a rigid, evacuated, 0.500 L container. The initial pressure of the $N_2O_4(g)$ is 760 atm. The temperature is held constant until ... | 0 | [
"the activation energy",
"the reaction rate",
"the position of equilibrium",
"the order of reaction"
] | |||||||||
Chemistry | Refer to the following information.
$N_2O_4(g)\rightleftarrows 2NO_2(g)$
$N_2O_4(g)$ decomposes into $NO_2(g)$ according to the equation above. A pure sample of $N_2O_4(g)$ is placed into a rigid, evacuated, 0.500 L container. The initial pressure of the $N_2O_4(g)$ is 760 atm. The temperature is held constant until ... | 2 | [
"760 torr",
"900 torr",
"634 torr",
"886 torr"
] | |||||||||
Chemistry | Refer to the following information.
$N_2O_4(g)\rightleftarrows 2NO_2(g)$
$N_2O_4(g)$ decomposes into $NO_2(g)$ according to the equation above. A pure sample of $N_2O_4(g)$ is placed into a rigid, evacuated, 0.500 L container. The initial pressure of the $N_2O_4(g)$ is 760 atm. The temperature is held constant until ... | 1 | [
"$K_p$ > 1",
"$K_p$< 1",
"$K_p$= 1",
"The data do not allow us to estimate the value of $K_p$."
] | |||||||||
Chemistry | Refer to the following information.
This formation equation for the reaction synthesizing RbBr(s) can be separated into a series of steps. Which of the steps in the table above are endothermic?
| 1 | [
"ΔH°(1) and ΔH°(2) only",
"ΔH°(1), ΔH°(2), and ΔH°(3) only",
"ΔH°(3) only",
"ΔH°(3) and ΔH°(4) only"
] | |||||||||
Chemistry | Refer to the following information.
This formation equation for the reaction synthesizing RbBr(s) can be separated into a series of steps. If this reaction goes to completion, producing RbBr from the reactants, and if you use the overall chemical equation to estimate the entropy change for this process, which of the f... | 0 | [
"The reaction is favorable and driven by the enthalpy change since the entropy decreases in this process.",
"The reaction is unfavorable since the entropy change is a large negative value.",
"The reaction is favorable and driven by both enthalpy and entropy changes.",
"The reaction is unfavorable because of t... | |||||||||
Chemistry | n-pentane ($C_5H_{12}$ or $CH_3CH_2CH_2CH_2CH_3$) and 2,2-dimethylpropane ($C_5H_{12}$ or $(CH_3)_4C$), shown above as space-filling models, each have the same number of carbon and hydrogen atoms but the atoms are arranged differently. n-pentane boils at 36.1 °C, and 2,2-dimethylpropane boils at 9.5 °C. Which statement... | 1 | [
"The long chains of n-pentane make it more difficult for them to reach the liquid surface and vaporize.",
"The long chains of n-pentane provide more sites for London attractive forces for neighboring molecules to have an effect on each other.",
"The compact structure of the 2,2-dimethylpropane directs the attra... | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions of 0.0100 M are prepared, and their pH values are recorded on a laptop computer. One of the solutions contains more than just an acid. At the point designated as "add," all four solutions are diluted with an equal volume of water. The bottom line repres... | 0 | [
"Solution 1",
"Solution 2",
"Solution 3",
"Solution 4"
] | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions of 0.0100 M are prepared, and their pH values are recorded on a laptop computer. One of the solutions contains more than just an acid. At the point designated as "add," all four solutions are diluted with an equal volume of water. The bottom line repres... | 3 | [
"Solution 1",
"Solution 2",
"Solution 3",
"They will all require the same volume of NaOH."
] | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions are prepared, and their pH values are determined and tabulated below. Using the data in the table above, which is the weakest acid?
| 3 | [
"Acid 1",
"Acid 2",
"Acid 3",
"Acid 4"
] | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions are prepared, and their pH values are determined and tabulated below. Which of the four acids is best described as a strong acid?
| 1 | [
"Acid 1",
"Acid 2",
"Acid 3",
"Acid 4"
] | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions are prepared, and their pH values are determined and tabulated below. Which of the following operations will produce an effective buffer solution?
| 1 | [
"50.0 mL of 0.010 M acid 3 mixed with 50.0 mL of 0.010 M acid 2",
"50.0 mL of 0.010 M acid 2 mixed with 25.0 mL of 0.010 M NaOH",
"50.0 mL of 0.0050 M acid 4 mixed with 0.25 mL of 0.0050 M NaOH",
"50.0 mL of 0.0010 M acid 2 mixed with 55.0 mL of 0.0010 M NaOH"
] | |||||||||
Chemistry | Refer to the following information.
Four different acid solutions are prepared, and their pH values are determined and tabulated below. Each of the acids were titrated with NaOH to the end point. The end point pH values are shown on the last line of the table. The end point pH values
| 2 | [
"suggest that acid 3 is strong and all the rest are weak",
"suggest that all the acids are weak",
"suggest that acid 1 is most likely polyprotic",
"suggest serious problems with the pH meter"
] | |||||||||
Chemistry | The graph above shows the distribution of kinetic energies of a system containing a large number of SO2 molecules at 300 K. Which letter shows the average kinetic energy of this system?
| 2 | [
"A",
"B",
"C",
"D"
] | |||||||||
Chemistry | Three 1-liter flasks are connected to a 3-liter flask by valves. The 3-liter flask is evacuated to start and the entire system is at 585 K. The first flask contains oxygen, the second hydrogen, and the third nitrogen. The pressure of hydrogen is 1.65 atm. The amounts of gas molecules are proportional to their represent... | 1 | [
"1.0 atm 0.5 atm",
"0.41 atm 0.82 atm",
"0.81 atm 1.65 atm",
"2.0 atm 1.0 atm"
] | |||||||||
Chemistry | A mass spectrum of a naturally occurring sample of an element is shown above. What is the element?
| 1 | [
"Ca",
"Ne",
"K",
"Not enough information is provided."
] | |||||||||
Chemistry | Refer to the titration curve below, which is of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.125 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the above graph. Which of the following describes the base that is being titrated?
... | 3 | [
"The base is dibasic since two end points are observed.",
"The concentration of the base is exactly 0.125 M.",
"The concentration of the base is slightly more than 0.125 M.",
"The concentration of the base is slightly less than 0.125 M."
] | |||||||||
Chemistry | Refer to the titration curve below, which is of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.125 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the above graph. Between which two points on the titration curve can the solution b... | 2 | [
"None, it is impossible for a titration solution to also be a buffer solution.",
"A to F",
"A to D",
"D to F"
] | |||||||||
Chemistry | Refer to the titration curve below, which is of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.125 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the above graph. For the best results with a visual indicator (one that changes col... | 1 | [
"Add the indicator two drops before the end point.",
"Choose an indicator that has a pK that is close to the end point pH.",
"Choose an indicator that has complementary colors.",
"Choose a polyprotic indicator."
] | |||||||||
Chemistry | Refer to the titration curve below, which is of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.125 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the above graph. If the student uses a pH indicator that changes color from pH 6 to... | 1 | [
"The observed color change will be distinct, and the calculated molarity of the base will be accurate.",
"The color will change slowly, and the end point volume will be low.",
"The color will change slowly, and the calculated molarity of the base will be low.",
"The observed color change will be distinct, but... | |||||||||
Chemistry | Refer to the titration curve below, which is of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.125 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the above graph. Which arrow points to the place on the curve where pH = pKaof the ... | 2 | [
"A",
"E",
"C",
"F"
] | |||||||||
Chemistry | In the diagram above, which labeled arrow is pointing toward a covalent bond and which is pointing toward a hydrogen bond?
Covalent Bond Hydrogen Bond
| 3 | [
"1 2",
"2 1",
"3 4",
"4 3"
] | |||||||||
Chemistry | Morphine, $C_{17}H_{19}NO_3$ (shown above), has a $K_b = 8.0 × 10^{-7}$. If a 0.00100 M solution of morphine is prepared, the expected pH will be in which one of the following pH ranges?
| 2 | [
"2 to 4",
"4 to 6",
"8 to 10",
"10 to 12"
] | |||||||||
Chemistry | The volume of a gas is charted over time, giving the above results. Which of the following options provides a possibel explinatin of what was happening to the gas during each phase of the graph?
| 1 | [
"During phase I, the temperature decreased while the pressure increased. During phase II, the temperature was held constant as the pressure decreased.",
"During phase I, the temperature increased while the pressure was held constant. During phase II, the temperature and pressure both decreased.",
"During phase ... | |||||||||
Chemistry | The above experiment was performed several times, and the data was gathered as shown in the figure. What is the rate law for this reaction?
| 3 | [
"rate = k[NO][Br$_2$]$^2$",
"rate = k[NO]$^2$[Br$_2$]$^2$",
"rate = k[NO][Br$_2$]",
"rate = k[NO]$^2$[Br$_2$]"
] | |||||||||
Chemistry | Regarding reaction II, to achieve the products present in the above diagram how many moles of each reactant must be present prior to the reaction?
| 2 | [
"1.0 mol of CH$_4$ and 2.0 mol of H$_2$O",
"2.0 mol of CH$_4$ and 2.0 mol of H$_2$O",
"2.0 mol of CH$_4$ and 3.0 mol of H$_2$O",
"3.0 mol of CH$_4$ and 2.0 mol of H$_2$O"
] | |||||||||
Chemistry | Identify the three gases represented on the Maxwell-Boltzmann diagram above. Assume all gases are at the same temperature.
| 2 | [
"I \\( \\mathrm{H_2} \\) II \\( \\mathrm{N_2} \\) III \\( \\mathrm{F_2} \\)",
"I \\( \\mathrm{H_2} \\) II \\( \\mathrm{F_2} \\) III \\( \\mathrm{N_2} \\)",
"I \\( \\mathrm{F_2} \\) II \\( \\mathrm{N_2} \\) III \\( \\mathrm{H_2} \\)",
"I \\( \\mathrm{N_2} \\) II \\( \\mathrm{F_2} \\) III \\( \\mathrm{H_2} \\)"... | |||||||||
Chemistry | The above diagrams shows the decomposition of hydrogen peroxide in a sealed container in the presence of a catalyst. What is the overall order for the reaction?
| 1 | [
"Zero order",
"First order",
"Second order",
"Third order"
] | |||||||||
Chemistry | One of the resonance structures for the nitrite ion is shown above. What is the formal charge on each atom?
| 3 | [
"O$_x$ -1; N +2; O$_y$ -1",
"O$_x$ +1; N -1; O$_y$ 0",
"O$_x$ 0; N 0 ; O$_y$ -1",
"O$_x$ -1; N 0 ; O$_y$ 0"
] | |||||||||
Chemistry | The following diagram supports which of the following conclusions about the reaction shown below?
| 1 | [
"There is an increase in entropy.",
"Mass is conserved in all chemical reactions.",
"The pressure increases after the reaction goes to completion.",
"The enthalpy value is positive."
] | |||||||||
Chemistry | The concentrations of the reactants and products in the reaction represented by the above graph are found to be changing very slowly. Which of the following statements best describes the reaction given that the reaction is exergonic? (ΔG < 0)
| 0 | [
"The reaction is under kinetic control.",
"The reaction has reached a state of equilibrium.",
"The reaction is highly exothermic in nature.",
"The addition of heat will increase the rate of reaction significantly."
] | |||||||||
Chemistry | What is the equilibrium expression for the reaction
| 0 | [
"\\( K = \\frac{[CO_2]^3}{[O_2]^5} \\)",
"\\( K = \\frac{[C_3H_8][O_2]^5}{[CO_2]^3[H_2O]^4} \\)",
"\\( K = \\frac{[C_3H_8]}{[H_2O]^4} \\)",
"\\( K = \\frac{[O_2]^5}{[CO_2]^3} \\)"
] | |||||||||
Chemistry | Given the two standard reduction equations and their potentials below, write the thermodynamically favored chemical reaction and its standard cell potential.
| 2 | [
"$\\text{Ag}^+ (\\text{aq}) + \\text{Mg}^{2+} (\\text{aq}) \\rightarrow \\text{Ag}(\\text{s}) + \\text{Mg}(\\text{s}) & -1.57\\ V $",
"$\\text{Ag}^+ (\\text{aq}) + \\text{Mg}(\\text{s}) \\rightarrow \\text{Ag}(\\text{s}) + \\text{Mg}^{2+} (\\text{aq}) & +3.17\\ V$",
"$2\\text{Ag}^+ (\\text{aq}) + \\text{Mg}(\\t... | |||||||||
Chemistry | In the diagram above, which labeled arrow is pointing toward a hydrogen bond?
| 2 | [
"1",
"2",
"3",
"4"
] | |||||||||
Chemistry | The graph above shows the distribution of kinetic energies of a large number of Ne atoms at 500 K. Which letter shows the average kinetic energy of this system?
| 2 | [
"A",
"B",
"C",
"D"
] | |||||||||
Chemistry | Consider the following possible mechanism for the reaction above: \[ \text{2SO}_2(g) + \text{O}_2(g) \rightarrow \text{2SO}_3(g) \] Consider the possible mechanism in the figure for the reaction above. Which of the following statements is true?
| 0 | [
"This mechanism has no free radicals.",
"\\(\\text{O}_2(g)\\) is an intermediate.",
"\\(\\text{SO}(g)\\) is a catalyst for this reaction.",
"The mechanism does not add up to the overall reaction."
] | |||||||||
Chemistry | Three 1-liter flasks are connected to a 3-liter flask by valves. The 3-liter flask is evacuated to start and the entire system is at 298K. The first flask contains helium, the second argon, and the third krypton. The pressure of the argon is 633 torr. The amounts of gas are proportional to their representations in the ... | 1 | [
"633 torr",
"316 torr",
"1266 torr",
"211 torr"
] | |||||||||
Chemistry | A portion of a mass spectrum of neon is presented above. Estimate the average mass of naturally occurring atoms of neon, assuming that the height of each line represents the relative amount of each mass.
| 0 | [
"20.3",
"20.0",
"21.0",
"Not enough information is provided"
] | |||||||||
Chemistry | The above graph shows a titration curve of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.075 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the graph. Which arrow points to the end point of this titration?
| 1 | [
"A",
"E",
"C",
"F"
] | |||||||||
Chemistry | The above graph shows a titration curve of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.075 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the graph. Which arrow points to the place on the curve where the pH is equal to 14 - pK... | 2 | [
"A",
"E",
"C",
"F"
] | |||||||||
Chemistry | The above graph shows a titration curve of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.075 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the graph. Find the two points on the curve that indicate the region where the solution ... | 2 | [
"0.5 pH unit",
"1 pH unit",
"2 pH units",
"3 pH units."
] | |||||||||
Chemistry | The above graph shows a titration curve of a weak base titrated with a strong acid. The pH was measured with a pH meter after small volumes of 0.075 M HCl were added to 25.0 mL of a weak base. Data from that experiment are shown in the graph. Which of the following describes the base that is being titrated?
| 3 | [
"The base is dibasic since two end points are observed.",
"The concentration of the base is 0.075 $M$.",
"The concentration of the base is slightly more than 0.075 $M$.",
"The concentration of the base is slightly less than 0.075 $M$."
] | |||||||||
Chemistry | Refer to the figure. The Lewis electron-dot structures for sulfur trioxide and for the sulfite ion are given above. Which statement best describes the geometry of these two substances?
| 0 | [
"The sulfite ion has a triangular pyramid shape, and the sulfur trioxide is a planar triangle.",
"Both substances are flat, triangular, planar shapes.",
"Both substances are triangular pyramids.",
"SO$_3$ is a triangular pyramid, and SO$_3^{2-}$ is a planar triangle."
] | |||||||||
Chemistry | Refer to the figure. Which statement below describes the charge, polarity, and resonance characteristics of the sulfite ion and of the sulfur trioxide species shown above?
| 1 | [
"The sulfite ion has two negative charges along with a shape that makes it a dipole. Sulfur trioxide is symmetrical and nonpolar. In addition, as written, both have three resonance structures.",
"The sulfite ion and sulfur trioxide are both polar with the only difference being that one is an ion and the other is ... |
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