Chemistry Year 11 - Module 3 - Lesson 12
Factors Affecting Reaction Rate
1. Key Ideas
The catalytic converter in a car uses platinum and palladium to convert toxic exhaust gases into harmless ones — without a catalyst, those reactions would require temperatures so high the car would melt.
- Key facts and terms for Factors Affecting Reaction Rate
- How the main ideas in Factors Affecting Reaction Rate connect
2. Success Criteria
By the end, you should be able to:
- Key facts and terms for Factors Affecting Reaction Rate
- Where this lesson fits in Module 3
- How the main ideas in Factors Affecting Reaction Rate connect
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. Q8. A reaction vessel contains a gaseous reaction at temperature T₁. Explain, using a Maxwell-Boltzmann energy distribution diagram, how increasing the temperature to T₂ increases the rate of the reaction. In your answer, describe: (a) the change in the distribution curve; (b) the change in the proportion of particles that can react; (c) the resulting change in effective collision frequency. (5 marks)
2. Q9. Compare homogeneous and heterogeneous catalysts. In your response: (a) define each type with a named example; (b) explain the mechanism by which a heterogeneous catalyst operates; (c) explain why a heterogeneous catalyst is generally preferred in large-scale industrial processes. (5 marks)
3. Q10. A car’s catalytic converter is in perfect working order. (a) Write a balanced equation for the catalytic oxidation of carbon monoxide in the converter. (b) Explain, using your knowledge of heterogeneous catalysis, why the converter does not reduce CO emissions in the first 30 seconds after the car is started. (c) Predict and explain the effect on CO emissions if the catalytic converter is damaged and its platinum surface is coated with lead compounds. (5 marks)
6. Extend: Apply the Idea
A student gives a memorised answer about Factors Affecting Reaction Rate but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about Factors Affecting Reaction Rate?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of Factors Affecting Reaction Rate?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.