CHEM 104 MODULE 7 PRACTICE EXAM
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2025
1. Which of the following best describes the rate of a chemical reaction?
A. The energy released by the reaction
B. The change in concentration of reactants or products over time
C. The total amount of product formed
D. The volume of reactants used
The rate of a reaction is defined by how fast the concentration of reactants
or products changes over time.
2. A catalyst increases the rate of a chemical reaction by:
A. Increasing the temperature
B. Increasing the equilibrium constant
C. Lowering the activation energy
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, D. Increasing the concentration of reactants
A catalyst works by lowering the activation energy needed for a reaction to
occur, thus speeding up the process.
3. Which factor does not affect the rate of a chemical reaction?
A. Temperature
B. Concentration
C. Color of reactants
D. Presence of a catalyst
The color of reactants is not a factor influencing reaction rate; the others
do.
4. The rate law for a reaction is given by: rate = k[A]^2[B]. What is the overall
order of the reaction?
A. First
B. Second
C. Third
D. Fourth
The overall order is the sum of the exponents: 2 + 1 = 3.
5. In a first-order reaction, if the concentration of reactant A is doubled, the
rate:
A. Stays the same
B. Doubles
C. Triples
D. Quadruples
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QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2025
1. Which of the following best describes the rate of a chemical reaction?
A. The energy released by the reaction
B. The change in concentration of reactants or products over time
C. The total amount of product formed
D. The volume of reactants used
The rate of a reaction is defined by how fast the concentration of reactants
or products changes over time.
2. A catalyst increases the rate of a chemical reaction by:
A. Increasing the temperature
B. Increasing the equilibrium constant
C. Lowering the activation energy
1|Page
, D. Increasing the concentration of reactants
A catalyst works by lowering the activation energy needed for a reaction to
occur, thus speeding up the process.
3. Which factor does not affect the rate of a chemical reaction?
A. Temperature
B. Concentration
C. Color of reactants
D. Presence of a catalyst
The color of reactants is not a factor influencing reaction rate; the others
do.
4. The rate law for a reaction is given by: rate = k[A]^2[B]. What is the overall
order of the reaction?
A. First
B. Second
C. Third
D. Fourth
The overall order is the sum of the exponents: 2 + 1 = 3.
5. In a first-order reaction, if the concentration of reactant A is doubled, the
rate:
A. Stays the same
B. Doubles
C. Triples
D. Quadruples
2|Page
