Kinetics - Extra Practice Problems Worksheet With Answer Key - General Chemistry Ii Page 14
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Catalysts
56. Which of the following statements about catalysts is false:
a. catalysts do not appear in the balanced equation
b. catalysts reduce the activation energy for a reaction
c. biological catalysts are called enzymes
d. catalysts do not alter the mechanism of the reaction and never appear in the rate law
e. since catalysts are recycled, even a small amount of catalyst can accelerate a reaction
57. Which of the following statements is false:
a. Changing the temperature does not change the activation energy for a reaction
b. At higher temperature a higher percentage of reactants have enough energy to get over the transition
state
c. The mechanism, rate law, and activation energy will all change when a catalyst is added.
d. The general rate law for a reaction does not changes with temperature, but the rate constant does change
e. The rate constant “k” for a reaction does not change when the temperature increases.
58. A proposed mechanism for the following reaction is shown below. Identify the catalyst in the reaction.
–
2H
O
(aq) → 2H
O(aq) + O
in the presence of I
(aq)
2
2
2
2
–
–
(slow)
Step 1: H
O
(aq) + I
(aq) → H
O() + OI
(aq)
2
2
2
–
–
(fast)
Step 2: H
O
(aq) + OI
(aq) → H
O() + O
(g) + I
(aq)
2
2
2
2
a.
H
O
d.
H
O
2
2
2
–
b.
OI
e.
O
2
–
c.
I
59. The steps in a reaction mechanism are as follows. Which species is acting as a catalyst?
+
4+
2+
3+
Step 1: Ag
(aq) + Ce
(aq) ↔ Ag
(aq) + Ce
(aq)
+
2+
2+
+
Step 2: Tl
(aq) + Ag
(aq) → Tl
(aq) + Ag
(aq)
2+
4+
3+
3+
Step 3: Tl
(aq) + Ce
(aq) → Tl
(aq) + Ce
(aq)
+
2+
a.
Ag
d.
Ag
+
3+
b.
Tl
e.
Tl
3+
c.
Ce
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