A treatment unit uses a solid catalyst to speed up a reaction that removes a harmful gas.
Scientists test the reaction with and without the catalyst. Each test starts with the same quantities of reactants at the same temperature. Both reactions are allowed to finish.
| Measurement | Without the catalyst | With the catalyst |
|---|---|---|
| Activation energy in kJ/mol\text{kJ/mol}kJ/mol | 175 | 85 |
| Number of collisions each second | 4.0 × 1020 | 4.0 × 1020 |
| Percentage of collisions that are successful | 0.050% | 6.0% |
Explain, using the data and collision theory, how adding the catalyst affects the time taken for the reaction to finish and the final amount of product.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.