CHEM 104 Module 1 | General Chemistry II w/ Lab Exam
Q&A | Portage Learning
These are original practice questions written for study. They are not official CHEM
104, Portage Learning, or university exam questions and are not copied from any
copyrighted question bank. They cover common CHEM 104 Module 1 | General
Chemistry II topics: chemical kinetics, reaction rates, rate laws, reaction order, half-life,
collision theory, activation energy, Arrhenius equation, reaction mechanisms, and
catalysis.
Question 1:
A nurse is reviewing a laboratory report showing a reaction rate of 2.5 × 10⁻³ M/s. Which
term best describes this value?
A. Rate constant
B. Reaction rate
C. Equilibrium constant
D. Activation energy
Correct answer: B
Rationale: Reaction rate is the change in concentration of a reactant or product per unit
time, expressed in M/s.
Question 2:
Which factor does NOT affect the rate of a chemical reaction?
A. Temperature
B. Concentration of reactants
C. Presence of a catalyst
D. Volume of the container (for solutions)
Correct answer: D
Rationale: For reactions in solution, volume does not directly affect rate; temperature,
concentration, and catalysts do.
Question 3:
A client asks why food cooks faster in a pressure cooker. Which principle best explains
this?
A. Increased concentration of reactants
B. Increased temperature increases reaction rate
,C. Decreased activation energy
D. Increased surface area
Correct answer: B
Rationale: Higher temperature increases kinetic energy and collision frequency,
speeding reactions.
Question 4:
In the reaction 2A → B, the rate of disappearance of A is 0.10 M/s. What is the rate of
appearance of B?
A. 0.05 M/s
B. 0.10 M/s
C. 0.20 M/s
D. 0.40 M/s
Correct answer: A
Rationale: Rate = −(1/2)Δ[A]/Δt = Δ[B]/Δt, so Δ[B]/Δt = 0.10/2 = 0.05 M/s.
Question 5:
Which unit is appropriate for a first-order rate constant?
A. M/s
B. s⁻¹
C. M⁻¹s⁻¹
D. M⁻²s⁻¹
Correct answer: B
Rationale: For first-order, rate = k[A], so k has units of s⁻¹.
Question 6:
Which unit is appropriate for a second-order rate constant?
A. M/s
B. s⁻¹
C. M⁻¹s⁻¹
D. M⁻²s⁻¹
Correct answer: C
Rationale: For second-order, rate = k[A]², so k has units of M⁻¹s⁻¹.
, Question 7:
A reaction has the rate law: rate = k[A][B]². What is the overall reaction order?
A. 0
B. 1
C. 2
D. 3
Correct answer: D
Rationale: Overall order = 1 + 2 = 3.
Question 8:
A reaction has the rate law: rate = k[A]⁰[B]². What is the overall reaction order?
A. 0
B. 1
C. 2
D. 3
Correct answer: C
Rationale: Zero-order in A contributes 0; overall order = 2.
Question 9:
For a zero-order reaction, the rate is:
A. Independent of reactant concentration
B. Directly proportional to reactant concentration
C. Proportional to the square of reactant concentration
D. Inversely proportional to reactant concentration
Correct answer: A
Rationale: Zero-order rate = k, independent of concentration.
Question 10:
For a first-order reaction, the half-life is:
A. Dependent on initial concentration
B. Independent of initial concentration
C. Proportional to initial concentration
D. Inversely proportional to initial concentration
Correct answer: B
Rationale: For first-order, t₁/₂ = 0.693/k, independent of [A]₀.
Q&A | Portage Learning
These are original practice questions written for study. They are not official CHEM
104, Portage Learning, or university exam questions and are not copied from any
copyrighted question bank. They cover common CHEM 104 Module 1 | General
Chemistry II topics: chemical kinetics, reaction rates, rate laws, reaction order, half-life,
collision theory, activation energy, Arrhenius equation, reaction mechanisms, and
catalysis.
Question 1:
A nurse is reviewing a laboratory report showing a reaction rate of 2.5 × 10⁻³ M/s. Which
term best describes this value?
A. Rate constant
B. Reaction rate
C. Equilibrium constant
D. Activation energy
Correct answer: B
Rationale: Reaction rate is the change in concentration of a reactant or product per unit
time, expressed in M/s.
Question 2:
Which factor does NOT affect the rate of a chemical reaction?
A. Temperature
B. Concentration of reactants
C. Presence of a catalyst
D. Volume of the container (for solutions)
Correct answer: D
Rationale: For reactions in solution, volume does not directly affect rate; temperature,
concentration, and catalysts do.
Question 3:
A client asks why food cooks faster in a pressure cooker. Which principle best explains
this?
A. Increased concentration of reactants
B. Increased temperature increases reaction rate
,C. Decreased activation energy
D. Increased surface area
Correct answer: B
Rationale: Higher temperature increases kinetic energy and collision frequency,
speeding reactions.
Question 4:
In the reaction 2A → B, the rate of disappearance of A is 0.10 M/s. What is the rate of
appearance of B?
A. 0.05 M/s
B. 0.10 M/s
C. 0.20 M/s
D. 0.40 M/s
Correct answer: A
Rationale: Rate = −(1/2)Δ[A]/Δt = Δ[B]/Δt, so Δ[B]/Δt = 0.10/2 = 0.05 M/s.
Question 5:
Which unit is appropriate for a first-order rate constant?
A. M/s
B. s⁻¹
C. M⁻¹s⁻¹
D. M⁻²s⁻¹
Correct answer: B
Rationale: For first-order, rate = k[A], so k has units of s⁻¹.
Question 6:
Which unit is appropriate for a second-order rate constant?
A. M/s
B. s⁻¹
C. M⁻¹s⁻¹
D. M⁻²s⁻¹
Correct answer: C
Rationale: For second-order, rate = k[A]², so k has units of M⁻¹s⁻¹.
, Question 7:
A reaction has the rate law: rate = k[A][B]². What is the overall reaction order?
A. 0
B. 1
C. 2
D. 3
Correct answer: D
Rationale: Overall order = 1 + 2 = 3.
Question 8:
A reaction has the rate law: rate = k[A]⁰[B]². What is the overall reaction order?
A. 0
B. 1
C. 2
D. 3
Correct answer: C
Rationale: Zero-order in A contributes 0; overall order = 2.
Question 9:
For a zero-order reaction, the rate is:
A. Independent of reactant concentration
B. Directly proportional to reactant concentration
C. Proportional to the square of reactant concentration
D. Inversely proportional to reactant concentration
Correct answer: A
Rationale: Zero-order rate = k, independent of concentration.
Question 10:
For a first-order reaction, the half-life is:
A. Dependent on initial concentration
B. Independent of initial concentration
C. Proportional to initial concentration
D. Inversely proportional to initial concentration
Correct answer: B
Rationale: For first-order, t₁/₂ = 0.693/k, independent of [A]₀.
