Grade 12 Chemistry: Reaction Rates
A comprehensive worksheet for Grade 12 Chemistry students covering factors affecting reaction rates, collision theory, and reaction mechanisms.
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Grade 12 Chemistry: Reaction Rates
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Read each question carefully and provide detailed answers based on your understanding of chemical kinetics and reaction rates. Show all your work for calculations.
1. Which of the following factors does NOT generally increase the rate of a chemical reaction?
Increasing the concentration of reactants
Decreasing the temperature
Adding a catalyst
Increasing the surface area of solid reactants
2. According to collision theory, for a reaction to occur, reactant particles must:
Collide with any orientation
Collide with energy less than the activation energy
Collide with correct orientation and sufficient energy
Avoid colliding with each other
3. A substance that increases the rate of a chemical reaction without being consumed in the reaction is called a .
4. The minimum energy required for a chemical reaction to occur is known as the energy.
5. For a first-order reaction, the rate is directly proportional to the of one reactant.
6. Explain how increasing the temperature affects the rate of a chemical reaction, using collision theory.
7. Describe the role of activation energy in a chemical reaction. How does a catalyst influence activation energy?
8. All collisions between reactant molecules lead to the formation of products.
True
False
9. The rate-determining step in a reaction mechanism is the slowest step.
True
False
10. Analyze the provided graph showing the relationship between reaction rate and temperature. Explain the trend observed and relate it to the kinetic energy of molecules.
