CHEM134 C003 LESSON 7: ADVANCED
CHEMICAL KINETICS QUESTIONS AND
ANSWERS WITH VERIFIED SOLUTIONS
2026/2027 UPDATE. JUST RELEASED
1. For a reaction of the form 3A + 2B -> C, the rate of disappearance of A is 0.060 M/s. What is
the rate of appearance of C?
A. 0.180 M/s
B. 0.040 M/s
C. 0.020 M/s
D. 0.060 M/s
Answer: C
Conceptual Explanation: The rate of reaction is defined as (1/a)d[A]/dt. Thus,
(1/3)Rate(A) = (1/1)*Rate(C). 0.060/3 = 0.020 M/s.
2. Which of the following units represents a third-order rate constant?
A. M^-2 s^-1
B. M^-1 s^-1
,C. s^-1
D. M s^-1
Answer: A
Conceptual Explanation: The general units for a rate constant are M^(1-n) s^-1. For n=3,
the units are M^-2 s^-1.
3. In a second-order reaction, if the initial concentration of the reactant is doubled, what
happens to the half-life?
A. It doubles
B. It is halved
C. It remains the same
D. It quadruples
Answer: B
Conceptual Explanation: For a second-order reaction, t(1/2) = 1 / (k[A]0). Doubling [A]0
results in the half-life being halved.
4. A reaction follows the rate law Rate = k[A]^2. If the concentration of A is tripled, the rate
increases by a factor of:
A. 9
B. 6
C. 3
, D. 27
Answer: A
Conceptual Explanation: Rate is proportional to [A]^2. (3)^2 = 9.
5. Which plot will yield a straight line for a first-order reaction?
A. [A] vs t
B. 1/[A] vs t
C. ln[A] vs t
D. [A]^2 vs t
Answer: C
Conceptual Explanation: The integrated rate law for first-order is ln[A] = -kt + ln[A]0,
which is the equation of a straight line.
6. The slope of a plot of 1/[A] versus time for a second-order reaction is equal to:
A. -k
B. ln(k)
C. k
D. -Ea/R
Answer: C
CHEMICAL KINETICS QUESTIONS AND
ANSWERS WITH VERIFIED SOLUTIONS
2026/2027 UPDATE. JUST RELEASED
1. For a reaction of the form 3A + 2B -> C, the rate of disappearance of A is 0.060 M/s. What is
the rate of appearance of C?
A. 0.180 M/s
B. 0.040 M/s
C. 0.020 M/s
D. 0.060 M/s
Answer: C
Conceptual Explanation: The rate of reaction is defined as (1/a)d[A]/dt. Thus,
(1/3)Rate(A) = (1/1)*Rate(C). 0.060/3 = 0.020 M/s.
2. Which of the following units represents a third-order rate constant?
A. M^-2 s^-1
B. M^-1 s^-1
,C. s^-1
D. M s^-1
Answer: A
Conceptual Explanation: The general units for a rate constant are M^(1-n) s^-1. For n=3,
the units are M^-2 s^-1.
3. In a second-order reaction, if the initial concentration of the reactant is doubled, what
happens to the half-life?
A. It doubles
B. It is halved
C. It remains the same
D. It quadruples
Answer: B
Conceptual Explanation: For a second-order reaction, t(1/2) = 1 / (k[A]0). Doubling [A]0
results in the half-life being halved.
4. A reaction follows the rate law Rate = k[A]^2. If the concentration of A is tripled, the rate
increases by a factor of:
A. 9
B. 6
C. 3
, D. 27
Answer: A
Conceptual Explanation: Rate is proportional to [A]^2. (3)^2 = 9.
5. Which plot will yield a straight line for a first-order reaction?
A. [A] vs t
B. 1/[A] vs t
C. ln[A] vs t
D. [A]^2 vs t
Answer: C
Conceptual Explanation: The integrated rate law for first-order is ln[A] = -kt + ln[A]0,
which is the equation of a straight line.
6. The slope of a plot of 1/[A] versus time for a second-order reaction is equal to:
A. -k
B. ln(k)
C. k
D. -Ea/R
Answer: C
