Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 12
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
40. For the chemical reaction A → C, a plot of 1/[A]
versus time was found to give a straight line with a
t
positive slope. What is the order of reaction?
A.
zeroth
B.
first
C.
second
D.
Such a plot cannot reveal the order of the reaction.
41. The graphs below all refer to the same reaction. What is the order of this reaction?
A.
zeroth order
B.
first order
C.
second order
D.
unable to predict
42. For what order reaction does the half-life get longer as the initial concentration increases?
A.
zeroth order
B.
first order
C.
second order
D.
none of them because half-life is always independent of the initial concentration
43. For a second order reaction, the half-life is equal to
A.
t
= 0.693/k.
1/2
B.
t
= k/0.693.
1/2
C.
t
= 1/k[A]
.
1/2
o
D.
t
= k.
1/2
E.
t
= [A]
/2k.
1/2
o
44. Which one of the following changes would alter the rate constant (k) for the reaction 2A + B → products?
A.
increasing the concentration of A
B.
increasing the concentration of B
C.
increasing the temperature
D.
measuring k again after the reaction has run for a while
12
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