A student measures the mass of product formed in an enzyme-controlled reaction.
Table
| Time / s | Total mass of product / mg |
|---|---|
| 0 | 0 |
| 20 | 18 |
| 50 | 36 |
| 80 | 45 |
What is the mean rate of product formation between 20 s and 50 s?
54 mg min−154\,\mathrm{mg\,min^{-1}}54mgmin−1
72 mg min−172\,\mathrm{mg\,min^{-1}}72mgmin−1
36 mg min−136\,\mathrm{mg\,min^{-1}}36mgmin−1
108 mg min−1108\,\mathrm{mg\,min^{-1}}108mgmin−1
44 exam-style questions on Edexcel GCSE Biology 1.3 Enzymes, covering 1.3.1 Mechanism of enzyme action, 1.3.2 Denaturation of enzymes, 1.3.3 Factors affecting enzyme activity, and 1.3.4 Measuring energy in food by calorimetry. Each one has a worked solution and a mark scheme showing where the marks go.