Multiple Choice Chemistry Quiz Template With Answers -Prof. Dan Schwartz Page 3
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610. (5 pts) With reference to the energy diagram below, what is the activation energy for the reaction of
ozone with atomic oxygen to form molecular oxygen?
(a) 14 kJ
E
(b) 392 kJ
O
+ O
3
(c) 406 kJ
(d) none of these
406kJ
392 kJ
O
+ O
2
2
rxn progress
11. (5 points) Consider a bimolecular reaction in the gas phase. Which one of the following changes in
conditions will NOT cause an increase in the rate of the reaction?
(a) add a catalyst
(b) increase the temperature at constant volume
(c) increase the volume at constant temperature
(d) all of the above will increase the rate of reaction
12. (5 points) A mechanism for a naturally-occurring reaction that destroys ozone is:
Step 1: O
(g) + HO (g)
HO
(g) + O
(g)
slow
3
2
2
Step 2: HO
(g) + O (g)
HO (g) + O
(g)
fast
2
2
Choose the answer that best fills in the blanks in the following sentence:
is the catalyst and
catalysis is occurring.
is a reaction intermediate and the
kinetics are
order.
(a) HO
, homogeneous, HO, second
2
(b) HO, heterogeneous, O, first
(c) HO
, heterogeneous, HO, first
2
(d) HO, homogeneous, HO
, second
2
13. (5 points) Which of the following statements is FALSE regarding the equilibrium constant K
?
c
(a) K
for a reaction at a particular temperature always has the same value.
c
(b) K
for the reverse reaction is the negative of K
for the forward reaction.
c
c
(c) The numerical value of K
depends on the form of the balanced reaction equation.
c
(d) When quoting K
it is customary to omit units.
c
Exam #3
Page 3
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