A reaction produces a gas. A student measures the gas made with and without catalyst R. The other conditions are the same in both experiments.
| Time (s) | Gas volume without catalyst R (cm³) | Gas volume with catalyst R (cm³) |
|---|---|---|
| 0 | 0 | 0 |
| 30 | 12 | 28 |
| 60 | 22 | 38 |
| 90 | 30 | 40 |
| 120 | 36 | 40 |
| 150 | 40 | 40 |
| 180 | 40 | 40 |
Compare the results and explain how catalyst R affects the reaction.
122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.