Reaction Rates Exam
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2025/2026
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1. What is the definition of reaction rate?
A. Change in pressure per unit time
B. Change in concentration of reactants or products per unit time
C. Total energy of reaction
D. Activation energy required
Answer: B
Rationale: Reaction rate is defined as how fast reactants are
consumed or products are formed over time.
2. Which unit is commonly used for reaction rate?
A. mol
B. mol/L
C. mol/L·s
,D. J/mol
Answer: C
Rationale: Reaction rate is concentration change per second.
3. Which factor does NOT affect reaction rate?
A. Temperature
B. Catalyst
C. Color of reactants
D. Concentration
Answer: C
Rationale: Color has no effect on molecular collision frequency or
energy.
4. Increasing temperature generally:
A. Decreases rate
B. Increases rate
C. Stops reaction
D. Has no effect
Answer: B
,Rationale: Higher temperature increases particle kinetic energy and
collision frequency.
5. A catalyst works by:
A. Increasing activation energy
B. Decreasing activation energy
C. Increasing product energy
D. Consuming reactants
Answer: B
Rationale: Catalysts lower activation energy, speeding up reactions.
6. Which collision leads to a successful reaction?
A. Low energy only
B. Incorrect orientation only
C. Proper orientation and sufficient energy
D. Any collision
Answer: C
Rationale: Effective collisions require correct orientation and enough
energy.
, 7. Increasing concentration increases reaction rate because:
A. Particles become larger
B. More frequent collisions occur
C. Activation energy decreases
D. Temperature increases
Answer: B
Rationale: More particles per volume leads to more collisions.
8. Which factor increases surface area?
A. Crushing a solid
B. Cooling a solution
C. Adding water
D. Decreasing pressure
Answer: A
Rationale: Smaller particles expose more surface for reaction.
9. Which statement about catalysts is TRUE?
A. They are consumed
B. They increase activation energy
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2025/2026
Q&A | Instant Download Pdf
1. What is the definition of reaction rate?
A. Change in pressure per unit time
B. Change in concentration of reactants or products per unit time
C. Total energy of reaction
D. Activation energy required
Answer: B
Rationale: Reaction rate is defined as how fast reactants are
consumed or products are formed over time.
2. Which unit is commonly used for reaction rate?
A. mol
B. mol/L
C. mol/L·s
,D. J/mol
Answer: C
Rationale: Reaction rate is concentration change per second.
3. Which factor does NOT affect reaction rate?
A. Temperature
B. Catalyst
C. Color of reactants
D. Concentration
Answer: C
Rationale: Color has no effect on molecular collision frequency or
energy.
4. Increasing temperature generally:
A. Decreases rate
B. Increases rate
C. Stops reaction
D. Has no effect
Answer: B
,Rationale: Higher temperature increases particle kinetic energy and
collision frequency.
5. A catalyst works by:
A. Increasing activation energy
B. Decreasing activation energy
C. Increasing product energy
D. Consuming reactants
Answer: B
Rationale: Catalysts lower activation energy, speeding up reactions.
6. Which collision leads to a successful reaction?
A. Low energy only
B. Incorrect orientation only
C. Proper orientation and sufficient energy
D. Any collision
Answer: C
Rationale: Effective collisions require correct orientation and enough
energy.
, 7. Increasing concentration increases reaction rate because:
A. Particles become larger
B. More frequent collisions occur
C. Activation energy decreases
D. Temperature increases
Answer: B
Rationale: More particles per volume leads to more collisions.
8. Which factor increases surface area?
A. Crushing a solid
B. Cooling a solution
C. Adding water
D. Decreasing pressure
Answer: A
Rationale: Smaller particles expose more surface for reaction.
9. Which statement about catalysts is TRUE?
A. They are consumed
B. They increase activation energy
