Grade 12 Kinetics Worksheet
A comprehensive worksheet for Grade 12 Physics students covering fundamental concepts of kinetics, including reaction rates, factors affecting rates, and reaction mechanisms.
Includes
Standards
Topics
Kinetics: Reaction Rates and Mechanisms
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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?
Temperature
Concentration of reactants
Presence of a catalyst
Change in enthalpy (ΔH)
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?
2
3
4
5
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.
True
False
9. The rate constant (k) for a reaction is independent of temperature.
True
False
Match each term on the left with its definition on the right.
10. Rate Law
a. The sequence of elementary steps by which a chemical reaction occurs.
11. Reaction Intermediate
b. An equation that relates the rate of reaction to the concentrations of reactants.
12. Reaction Mechanism
c. A species that is formed in one step of a reaction mechanism and consumed in a subsequent step.
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.