Chemistry – Reaction Kinetics Exam

Chemistry Examination

Assessment of Reaction Kinetics Concepts

Class
1st Year
Subject
Chemistry (SNC)
Paper Type
Chapter Assessment

Chapter 7: Reaction Kinetics

Q1. Multiple Choice Questions
10 Marks

Choose the correct option for each of the following questions. Each question carries 1 mark.

1. The rate of reaction:
A Increases as the reaction proceeds
B Decreases as the reaction proceeds
C Remains the same as the reaction proceeds
D May decrease or increase as the reaction proceeds
2. How does the presence of a catalyst affect the rate of a chemical reaction?
A It always decreases the rate of the reaction
B It always increases the rate of the reaction
C It increases the rate of the forward and decreases the rate of the reverse reaction
D It increases the rate of both the forward and reverse reactions
3. Collision theory explains:
A Melting of solids
B Freezing of gases
C Chemical reaction rates
D Atomic structure
4. The energy required for effective collisions is called:
A Activation energy
B Lattice energy
C Ionization energy
D Potential energy
5. Rate of reaction tells how:
A fast or slow a reaction occurs
B heat is released
C product looks
D long atoms live
6. Instantaneous rate is measured:
A Over a long period
B At one particular time
C At equilibrium
D Using temperature
7. Rate is highest at:
A Start
B Completion
C Middle
D End
8. A rise in temperature usually:
A Makes collisions less effective
B Makes collisions more effective
C Reduces kinetic energy
D Does nothing to rate
9. If rate = k[A], the reaction is:
A Zero order
B First order
C Second order
D Third order
10. If rate = k[A]0, what happens to rate if [A] is doubled?
A Doubled
B Halved
C No change
D Becomes zero
Q2. Short Answer Questions
15 Marks

Write down short answers to the following questions.

  1. Give the difference between enthalpy change of reaction and energy of activation of reaction.
  2. What role does the activation energy play in chemical reactions? (Quick Check 7.1)
  3. Why do you think chemists want to know the order of a reaction and the rate constant for a reaction?
  4. Give an example of a fast reaction.
  5. Give an example of a slow reaction.
  6. Describe how gas evolution is used to measure rate.
  7. How can we monitor the progress of a reaction?
  8. Difference between catalyst and reactant.
  9. How do enzymes work as catalysts?
  10. Explain the role of surface area in solids-gas reactions.
  11. What is rate constant (k)?
  12. Difference between zero-order and first-order reactions.
  13. How do you calculate overall order of a reaction?
  14. Describe rate law for a reaction involving multiple reactants.
  15. What is the relation between order and reaction mechanism?
Q3. Detailed Answer Questions
10 Marks

Write detailed answers to the following questions. (Answer any 2)

1. Relate the order of a reaction to the rate law for the reaction. How do you distinguish between zero order, first order and second order reaction?
Order Rate Law Half-life Units of k
Zero Order rate = k t1/2 = [A]0/2k mol L-1 s-1
First Order rate = k[A] t1/2 = 0.693/k s-1
Second Order rate = k[A]2 t1/2 = 1/k[A]0 L mol-1 s-1
2. Discuss in detail the five major factors that affect the rate of a chemical reaction with examples.
3. Derive a general rate expression and explain how to calculate overall order of reaction.
General Rate Law: rate = k[A]m[B]n
Overall Order = m + n

MCQ Section Score

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