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Chemistry Multiple Choice and Math Questions: Equilibrium, Acids and Bases, Kinetics, Exercises of Chemistry

University of Arkansas (UA)Chemistry

A comprehensive set of multiple-choice and math questions covering key concepts in chemistry, including chemical equilibrium, acids and bases, and chemical kinetics. The questions are designed to test understanding of equilibrium constants, acid-base strength, ph calculations, reaction rates, and activation energy. Suitable for students studying general chemistry at the university or high school level.

Typology: Exercises

2024/2025

Uploaded on 04/07/2025

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Multiple Choice Questions:
1. The reaction below has a Kp value of 41.0. What is the value of Kc for this reaction at
275 K?
N2(g) + 3 H2(g) โ†’ 2 NH3(g)
a. 1.82
b. 8.05 ร— 10-2
c. 46.0
d. 2.09 ร— 104
e. 9.24 ร— 103
2. Considering the following reaction mechanism, which of the following is/are true?
A2 โ‡„ 2 A (FAST)
A + B โ†’ AB (SLOW)
AB + D โ‡„ AD + B (FAST)
a. The overall reaction for this mechanism is A2 + D โ†’ AD + A
b. The first step of this mechanism is unimolecular; the second and third step are
bimolecular
c. Ab is a catalyst for this reaction
d. The proposed rate law is Rate=k[X][Y]
3. Which of the following is/are correct?
a. In order of decreasing acid strength (strongest to weakest), arrange: nitric acid,
hydronium ion, nitrous acid.
b. An aqueous basic solution has a lower hydronium ion concentration than
hydroxide ion concentration
c. If Ka = 4.6*10-4 for HNO2 and Ka=3.5*10-4 for HF, then nitrite is a stronger base
than fluoride
4. A reaction vessel contains 0.025 mol of solid PbBr2, 0.0045 M aqueous Pb2+, and 0.013
M aqueous Br-. PbBr2(s) โ‡„ Pb2+(aq) + 2 Br -(aq). Kc = 6.3 ร— 10 -6. Which of the
following is/are true?
a. The solution is unsaturated
b. The solution is saturated
c. The solution is supersaturated
d. The reaction must shift to the right to reach equilibrium
e. The reaction is at equilibrium
f. The reaction must shift left to reach equilibrium.
g. Q < K
h. Q = K
i. Q > K
5. Which of the following is/are true regarding the following information?
Kb for NH3 = 1.76 ร— 10^-5
Ka for HCN = 4.9 ร— 10^-10
Ka for HF = 3.5 ร— 10^-4
a. Potassium nitrate should form a neutral solution
b. KF is a weaker base than NaCN
c. NH4F should be a slightly basic solution
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Download Chemistry Multiple Choice and Math Questions: Equilibrium, Acids and Bases, Kinetics and more Exercises Chemistry in PDF only on Docsity!

Multiple Choice Questions:

  1. The reaction below has a Kp value of 41.0. What is the value of Kc for this reaction at 275 K? N2(g) + 3 H2(g) โ†’ 2 NH3(g) a. 1. b. 8.05 ร— 10- c. 46. d. 2.09 ร— 10^4 e. 9.24 ร— 10^3
  2. Considering the following reaction mechanism, which of the following is/are true? A2 โ‡„ 2 A (FAST) A + B โ†’ AB (SLOW) AB + D โ‡„ AD + B (FAST) a. The overall reaction for this mechanism is A 2 + D โ†’ AD + A b. The first step of this mechanism is unimolecular; the second and third step are bimolecular c. Ab is a catalyst for this reaction d. The proposed rate law is Rate=k[X][Y]
  3. Which of the following is/are correct? a. In order of decreasing acid strength (strongest to weakest), arrange: nitric acid, hydronium ion, nitrous acid. b. An aqueous basic solution has a lower hydronium ion concentration than hydroxide ion concentration c. If Ka = 4.610-4^ for HNO 2 and Ka=3.510-4^ for HF, then nitrite is a stronger base than fluoride
  4. A reaction vessel contains 0.025 mol of solid PbBr 2 , 0.0045 M aqueous Pb2+, and 0. M aqueous Br-. PbBr 2 (s) โ‡„ Pb2+(aq) + 2 Br - (aq). Kc = 6.3 ร— 10 -6. Which of the following is/are true? a. The solution is unsaturated b. The solution is saturated c. The solution is supersaturated d. The reaction must shift to the right to reach equilibrium e. The reaction is at equilibrium f. The reaction must shift left to reach equilibrium. g. Q < K h. Q = K i. Q > K
  5. Which of the following is/are true regarding the following information? Kb for NH 3 = 1.76 ร— 10^- Ka for HCN = 4.9 ร— 10^- Ka for HF = 3.5 ร— 10^- a. Potassium nitrate should form a neutral solution b. KF is a weaker base than NaCN c. NH 4 F should be a slightly basic solution

d. iron(II) bromide should form a neutral solution

  1. Which of the following is/are true about iodic acid and bromic acid? a. Iodic acid is a weaker acid than bromic acid b. Hydrochloric acid is a weaker acid than hydrobromic acid c. Nitrate is a stronger base than nitrite d. Bromous acid is a stronger acid than bromic acid
  2. For the exothermic reaction below, equilibrium is initially established. Which of the following is/are true given the stated change? PCl3 (l) + Cl2(g) โ‡„ PCl5(g) a. If a catalyst is added to the reaction vessel, there will be no shift b. If Cl2 is removed from the reaction vessel, there will be a shift left to reestablish equilibrium c. If the volume of the reaction vessel is increased, there will be a shift left to reestablish equilibrium. d. If the reaction vessel is cooled, there will be a shift left to reestablish equilibrium
  3. Which of the following is/are true when a reaction reaches equilibrium? a. When a reaction reaches equilibrium, the forward and reverse reaction rates are equal b. At a given temperature, different starting concentrations may yield different equilibrium concentrations, but the value of K is constant for a reaction c. A reaction is reversible if the reverse reaction has a fast rate d. When K is much greater than 1, the reverse reaction is favored and there will be relatively small concentrations of products compared to reactants
  4. Which of the following is/are true? a. Strong acids completely ionize; weak acids partially ionize b. According to the Arrhenius definition ,an acid produces hydronium in aqueous solution; according to the Bronsted-Lowry definition, a base is a proton acceptor c. The conjugate acid of dihydrogen phosphate is hydrogen phosphate d. In the reaction between bromic acid and water bromate and the hydronium ion are an acid-base conjugate pair
  5. For the exothermic reaction below, equilibrium is initially established. Which of the following is/are true given the stated change? PCl3 (l) + Cl2(g) โ‡„ PCl5(g) a. If the reaction vessel is cooled, there will be a shift right to reestablish equilibrium b. If the volume of the reaction vessel is increased, there will be no shift c. If PCl5 is removed from the reaction there will be a shift left to reestablish equilibrium d. If PCl3 is added to the reaction vessel there will be a shift to the right to reestablish equilibrium
  6. Which of the following is/are true? a. Nitrite is a stronger base than nitrate b. Bromic acid is a stronger acid than bromous acid c. Bromic acid is a weaker acid than iodic acid d. Hydrochloric acid is a stronger acid than hydrobromic acid

Math Questions:

  1. For the reaction below, Kp = 247 at 91.9ยฐC. Calculate Kc at this temperature. X 4 (s) + 2 Z 2 (g) โ†’ 4 XZ(g)
  2. Calculate the pH of an aqueous 10.62 M hydroiodic acid solution. 3 sig figs
  3. A certain aqueous monoprotic acid has a percent ionization of 0.0014% for a 1.36 M solution. Calculate the acid ionization constant for the acid.
  4. A certain aqueous monoprotic acid has a pH of 4.02 for a 0.145 M solution. Calculate the acid ionization constant for the acid. 3 sig figs.
  5. For the reaction: A โ†’ Products, the first half-life is 64.5 s when the initial concentration of A is 1.43 M. Each consecutive half-life thereafter is also 64.5 s. Calculate the rate of the reaction (in M/s) at 175 s. 3 sig figs.
  6. A reaction vessel initially contains 0.629 atm H2, 0.629 atm Br2, and 3.84 atm HBr. At the temperature of the reaction, Kp = 3.18. Calculate the equilibrium pressure in atm of Br2. H 2 (g) + Br 2 (g) <-> 2 HBr(g)
  7. The activation energy for a reaction is 33.3 kJ/mol. At what temperature in ยฐC will the rate constant be double the rate constant at 33.6ยฐC?
  1. Calculate the equilibrium constant for the following reactions, given the following. Enter your answer to 3 significant figures: B + C โ‡„ BC 2A2 โ†’ 4A K = 0. 2A + B โ†’ A2B K = 128 A2 + BC โ†’ A2B + C K = 9.
  2. A reaction vessel at equilibrium contains 55.5 g C and 2.62 atm CO2. Calculate the partial pressure of CO in atm in the vessel. CO2(g) + C(s) โ‡„ 2 CO(g), Kp = 87.
  3. A reaction vessel initially contains 0.301 atm H 2 , 0.813 atm Br 2 , and 8.74 atm HBr. At the temperature of the reaction, Kp = 6.98. Calculate the equilibrium pressure in atm of HBr. H 2 (g) + Br 2 (g) โ‡„ 2 HBr(g)
  4. A reaction vessel initially contains 4.79 atm H 2 , 3.39 atm S 2 , and 6.77 atm H 2 S. After equilibrium is established, the pressure of H2 is 1.66 atm. Calculate the equilibrium pressure of S 2. 2 H 2 (g) + S 2 (g) โ‡„ 2 H 2 S(g)
  5. Calculate the pH of a 0.0421 M KOH solution.
  6. A certain aqueous monoprotic weak acid has an acid dissociation constant of 3.79 ร— 10^-6. Calculate the pH of the solution when the concentration of this weak acid is 2. M.
  7. Calculate the pH of an aqueous weak base solution where the weak base has a concentration of 1.83 M and Kb = 5.13 ร— 10^-6.
  1. For the reaction below Kp = 951 at 80.8 oC. Calculate Kc at this temperature. Give your answer to 3 significant figures. X 4 (s) + 2 Z 2 (g) โ‡„ 4 XZ(g)
  2. For the reaction A โ†’ Products, the first half-life is 73.3 s when the initial concentration of A is 2.55 M. Each consecutive half-life thereafter is also 73.3 s. Calculate the rate of reaction (in M/s) at 172 s. Give your answer to 3 significant figures.
  3. If the activation energy for a reaction is 57.6 kJ/mol, at what temperature in oC will the rate constant be double the rate constant at 54.9 oC? Give your answer to 3 significant figures.
  4. A reaction vessel initially contains 2.84 atm H 2 , 9.74 atm Br 2 , and 0.271 atm HBr. At the temperature of the reaction, Kp = 0.892. Calculate the equilibrium pressure in atm of Br 2. Give your answer to 3 significant figures. H 2 (g) + Br 2 (g) โ‡„ 2 HBr(g)
  5. A reaction vessel initially contains 4.37 atm H 2 , 2.74 atm S 2 , and 5.79 atm H 2 S. After equilibrium is established, the pressure of H 2 is 1.43 atm. Calculate Kp. GIve your answer to 3 significant figures. 2 H 2 (g) + S 2 (g) โ‡„ 2 H 2 S(g)
  6. A certain aqueous monoprotic acid has a percent ionization of 0.0787% for a 0.23 M solution. Calculate the acid ionization constant for the acid. Give your answer to 3 significant figures.
  7. A certain aqueous monoprotic weak acid has an acid dissociation constant of 8.84 x 10-8. Calculate the pH of the solution when the concentration of this weak acid is 0.0265 M. Give your answer to 3 significant figures.
  1. Calculate the pH of an aqueous 4.848 M hydrochloric acid solution. Give your answer to 3 significant figures.
  2. A reaction vessel initially contains 0.269 atm H 2 and 9.41 atm Br 2. At the temperature of the reaction, Kp = 6.78x10-11. Calculate the equilibrium pressure in atm of HBr. Give your answer to 3 significant figures. H 2 (g) + Br 2 (g) โ‡„ 2 HBr(g)
  3. Calculate the pH of an aqueous weak base solution where the weak base has a concentration of 2.97 M and Kb = 9.78 x 10-5. Give your answer to 4 significant figures.
  4. For the reaction below, Kc = 0.545 at 61.7 oC. Calculate Kp at this temperature. Give your answer to 3 significant figures. X 4 (s) + 2 Z 2 (g) โ‡„ 4 XZ(g)
  5. Calculate the pH of a 0.0091 M KOH solution. Give your answer to 4 significant figures.
  6. B + C โ‡„ BC Calculate the equilibrium constant for the above reaction, given the following. Enter your answer to 3 significant figures. ยฝ A 2 โ‡„ A K = 0. A 2 B โ‡„ 2 A + B K = 4. A 2 B + C โ‡„ A 2 + BC K = 981
  7. If the activation energy for a reaction is 11.7 kJ/mol and the rate constant at 35.8 oC is 0.457, what will the rate constant be at 136 oC? Give your answer to 3 significant figures
  1. A reaction vessel initially contains 0.337 atm H 2 , 0.741 atm S 2 , and 1.62 atm H 2 S. After equilibrium is established, the pressure of H 2 is 0.857 atm. Calculate Kp. Give your answer to 3 significant figures. 2 H 2 (g) + S 2 (g) โ‡„ 2 H 2 S(g)