Grade 12 Kinetics Worksheet

Kinetics: Reaction Rates and Mechanisms

Read each question carefully and answer to the best of your ability. Show all your work for calculations.

1. Which of the following factors does NOT affect the rate of a chemical reaction?

2. For a reaction 2A + B → C, if the concentration of A is doubled and the concentration of B is kept constant, the reaction rate quadruples. If the concentration of B is doubled and the concentration of A is kept constant, the reaction rate doubles. What is the overall order of the reaction?

3. The minimum amount of energy required to initiate a chemical reaction is called the  .

4. A substance that increases the rate of a chemical reaction without being consumed in the process is called a  .

5. The slowest step in a reaction mechanism is known as the   step.

6. Explain the collision theory in relation to reaction rates. What three conditions must be met for a collision to be effective?

7. Describe how increasing the surface area of a solid reactant affects the rate of a reaction. Provide an example.

8. A catalyst changes the equilibrium position of a reversible reaction.

9. The rate constant (k) for a reaction is independent of temperature.

Match each term on the left with its definition on the right.

13. Consider the reaction: A + 2B → C. The following initial rate data were obtained:

Experiment | [A] (M) | [B] (M) | Initial Rate (M/s) ---|---|---|--- 1 | 0.10 | 0.10 | 4.0 x 10⁻⁵ 2 | 0.20 | 0.10 | 8.0 x 10⁻⁵ 3 | 0.10 | 0.20 | 1.6 x 10⁻⁴

a) Determine the order of the reaction with respect to A.

b) Determine the order of the reaction with respect to B.

c) Write the rate law for this reaction.

d) Calculate the value of the rate constant (k) with appropriate units.