Level 1: Core Concepts Check (Aiming for a Pass - 'S')

1. Define: What is meant by the "rate of reaction"?

2. List: Name the four factors that can change the rate of a chemical reaction.

3. Define: What is a catalyst?

4. Recall: According to collision theory, what must particles do for a reaction to occur?

5. Identify: Which has a larger surface area: a 10g block of marble or 10g of powdered marble?

6. State: How does increasing temperature generally affect the reaction rate?

7. State: How does increasing concentration generally affect the reaction rate?

8. Recall: What is the name for the minimum amount of energy needed for a reaction to happen?

9. Identify: What are biological catalysts called?

Level 2: Connecting the Dots (Aiming for a Credit - 'C')

1. Explain: Using collision theory, explain why a reaction between two gases is faster at a higher pressure.

2. Describe: You are reacting magnesium ribbon with acid. How could you measure the rate of this reaction in the lab?

3. Apply: Explain why a log of wood burns slowly, but the same wood chopped into small splinters burns very quickly.

4. Explain: How does a catalyst work to speed up a reaction? (Hint: Mention activation energy).

5. Interpret: A graph shows the volume of gas produced over time. Where is the reaction fastest, and how can you tell from the graph?

Level 3: Exam Challenge (Aiming for a Distinction - 'A'/'B')

1. Experimental Design: A student wants to investigate how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid (the "disappearing cross" experiment). (a) List the key apparatus needed. (b) What is the independent variable (the one you change)? (c) What is the dependent variable (the one you measure)? (d) List two variables that must be kept constant to ensure a fair test. (e) What relationship do you expect to find between temperature and the time taken for the cross to disappear?