Transcript Powerpoint Review for Exam

Ch. 15 Kinetics
Exam Review
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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
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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
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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
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• 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
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• 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
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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
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• 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)