1. Chapter Twelve Chemical Kinetics

2. 1.3  10–2 atm/s 9.0  10–3 atm/s 6.0  10–3 atm/s 4.5  10–2 atm/s
The average rate of disappearance of ozone in the reaction 2O3(g)  3O2(g) is found to be 9.0  10–3 atm over a certain interval of time. What is the rate of appearance of O2 during this interval?
1.3  10–2 atm/s
9.0  10–3 atm/s
6.0  10–3 atm/s
4.5  10–2 atm/s
2.7  10–2 atm/s

3. Rate = k[A] Rate = k[B] Rate = k[A][B] Rate = k[A]2[B] Rate = k[A][B]2
For the reaction A + B  products, the following data were obtained: Initial rate [A] [B] What is the experimental rate law?
Rate = k[A]
Rate = k[B]
Rate = k[A][B]
Rate = k[A]2[B]
Rate = k[A][B]2

4. The rate constant k is dependent on:
the concentration of the reactant.
the concentration of the product.
the temperature.
the order of the reaction.

5. For which order reaction is the half-life of the reaction proportional to 1/k (where k is the rate constant)?
Zero order
First order
Second order
All of these

6. For a first-order reaction
For a first-order reaction aA → Products the first half-life is 20 minutes. What is the second half-life?
10 minutes
20 minutes
40 minutes

7. For a second-order reaction
For a second-order reaction aA → Products the first half-life is 20 minutes. What is the second half-life?
10 minutes
20 minutes
40 minutes

8. For a zero-order reaction
For a zero-order reaction aA → Products the first half-life is 20 minutes. What is the second half-life?
10 minutes
20 minutes
40 minutes

9. At a particular temperature, the half-life of a zero-order reaction is 20.0 min. How long will it take for the reactant concentration to be depleted by a factor of 8?
20.0 min
35.0 min
60.0 min
140.0 min
160.0 min

10. The rate determining step of a multi-step reaction can best be described as:
The slowest step of the reaction
The fastest step of the reaction
The first step of the reaction
The last step of the reaction

11. Consider the following potential energy diagram:
Which letter shows the activation energy of the uncatalyzed reaction? a b c d e

12. Consider the following potential energy diagram:
Which letter shows the change in energy for the overall reaction? a b c d e

13. Consider the following potential energy diagram:
Which letter shows the activation energy of the catalyzed reaction? a b c d e