Unit 5 Review Questions

Which of the following is the best interpretation of the data?

1. The data supports a first-order reaction
2. The data supports a second-order reaction
3. The data support a zero-order reaction
4. The overall order is 14

5.3

5.9

The elementary steps in a proposed mechanism for the reaction 2NO + O2 → 2NO2 are represented by the equations above. Which of the following is the rate law for the overall reaction that is consistent with the proposed mechanism?

The energy diagram for the reaction X + Y → Z is shown above. The addition of a catalyst to this reaction would cause a change in which of the indicated energy differences?

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(A) I only

(B) II only

(C) III only

(D) I and II only

5.11

5.4

Based on the proposed mechanism, which of the following correctly identifies both the chemical equation and the rate law for the overall reaction?

H3AsO4 + 3 I– + 2 H3O → H3AsO3 + I3– + H2O

The oxidation of iodide ions by arsenic acid in acidic aqueous solution occurs according to the stoichiometry shown above. The experimental rate law of the reac­tion is:

Rate = k[H3AsO4] [I–] [H3O+]

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According to the rate law for the reaction, an increase in the concentration of hydronium ion has what effect on this reaction?

(A) The rate of reaction increases.

(B) The rate of reaction decreases.

(C) The value of the equilibrium constant increases.

(D) The value of the equilibrium constant decreases.

(E) Neither the rate nor the value of the equilibrium constant is changed.

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5.2

5.10

Draw a graph that represents the following reaction that has an overall -ΔH

5.5

Assume a reaction occurs by the mechanism given below. What is the rate law for the reaction?

A + B ↔ C fast

C → D slow

a) Rate = k[A][B][C]

b) Rate = k[A]2

c) Rate = k[A][B]

d) Rate = k[A][B]/[D]

e) Rate = k[A]

5.7

Which of the following is a graph that describes the pathway of reaction that is endothermic (absorbs energy) and has high

activation energy?

5.6

5.1