A reaction in living cells is studied with and without an enzyme. The mean results are shown.
| Condition | Product formed after 20 s (mg) | Product formed when the reaction stopped (mg) |
|---|---|---|
| Without enzyme | 9 | 90 |
| With enzyme | 36 | 90 |
Use the results and collision theory to explain the effect of the enzyme on this 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.