Chemistry 102, Test Chapter 13-14 Worksheet With Answers - 1997
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11Chemistry 102
Test chapter 13&14
February 3, 1997
THIS IS FORM A [FORM B PROBLEM #s in ( )]
Name
Choose the single best answer to each question.
1.(6) For a first order reaction, which of the following changes as the concentration of the
reactant changes?
A. rate
B. rate constant
C. half-life
1. A only
2. B only
3. C only
4. A and B only
5. B and C only
6. A, B, and C
Answer: 1. A only
For a first -order reaction, the rate law is: Rate = k[A]
As [A] changes, the rate changes. Rate and [A] are directly proportional. The rate constant,
k, does not depend on [A]. k is a constant for a particular reaction at a particular temperature
and is not dependent on [A]. The half-life is dependent only on the rate constant, k, not on
[A]: t
= 0.693/k
1/2
2
2.(4) The reaction A + B
C has the rate expression Rate = k[A]
[B]. If the
concentration of A is tripled and the concentration of B is doubled, the rate would be
increased by a factor of
1. 6
2. 9
3. 12
4. 18
5. 36
2
Answer: 4. 18
Rate = k[A]
[B]
Take [A] = 3 since the concentration of A is
tripled; take [B] = 2 since the concentration of B is doubled:
2
Rate = k[3]
[2];
Rate = k[9][2]
Rate = 18k
Rate increases by a factor of 18
+
-
3.(7) Given the following rate data for the reaction NH
+ NO
N
+ 2 H
O:
4
2
2
2
+
-
[NH
]
[NO
]
Initial Rate, M/s
4
2
0.010
0.020
0.020
0.015
0.020
0.030
0.010
0.010
0.005
The rate law for the reaction is:
+
-
+
2
-
1. Rate = k[NH
][NO
]
2. Rate = k[NH
]
[NO
]
4
2
4
2
+
-
2
+
2
-
3. Rate = k[NH
][NO
]
4. Rate = k[NH
]
[NO
]
4
2
4
2
+
-
2
Answer: 3. Rate = k[NH
][NO
]
4
2
+
First, determine the order with respect to NH
:
4
+
[NH
]
Rate
4
0.010
0.020
-
0.015
0.030
Hold [NO
] constant at 0.020 M
2
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