Ch. 15 Kinetics Exam Review

1 Which statement concerning relative rates of reaction is correct for the decomposition of phosphine? 4 PH3(g) → P4(g) + 6 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.

E

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)

C

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  

C

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 3 e) 1, 2, and 3

E

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

D

6 What is the overall order of the reaction below 2 NO(g) + 2 H2(g) → N2(g) + 2 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

D

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)