1. Ch. 15 Kinetics
Exam Review

2. 1
Which statement concerning relative rates of reaction is correct for the decomposition of phosphine?
4 PH3(g) → P4(g) H2(g)
a) The rate of disappearance of PH3 is 6/4 the rate of appearance of H2.
b) The rate of appearance of P4 is equal to the rate of appearance of H2.
c) The rate of disappearance of PH3 is 1/4 the rate of appearance of P4.
d) The rate of disappearance of PH3 is 4 times the rate of appearance of H2.
e) The rate of appearance of H2 is 6 times the rate of appearance of P4.

3. E

4. 2
Which relationship is correct for the rate of decomposition of dinitrogen pentaoxide?
2 N2O5(g) → 4 NO2(g) + O2(g) a) b) c) d) e)

5. C

6. 3
Ozone decomposes to oxygen according to the balanced chemical equation below.
2 O3(g) → 3 O2(g)
If the rate of disappearance of ozone is -7.2  10-4 M/s, what is the rate of formation of oxygen?
a) 4.8  10-4 M/s b) 7.2  10-4 M/s c) 1.1  10-3 M/s d) 1.4  10-3 M/s e) 2.2  10-3 M/s

7. C

8. 4
Which of the following changes are likely to increase the rate of a chemical reaction?
1. Adding a catalyst
2. Increasing the temperature of the reactants
3. Increasing the concentrations of the reactants
a) 1 only b) 2 only c) 3 only d) 1 and e) 1, 2, and 3

9. E

10. 5
What is the name given to a substance that increases the rate of a chemical reaction but is not itself consumed?
a) reactant b) product c) intermediate d) catalyst e) element

11. D

12. 6 What is the overall order of the reaction below
2 NO(g) H2(g) → N2(g) H2O(g)
if it proceeds via the following rate expression?
a) zero-order b) first-order c) second-order d) third-order e) fourth-order

13. D

14. 7
For the reaction A + 2B → C, the rate law is What are the units of the rate constant where time is measured in seconds?
a) b) c) d) e)