A reaction forms a coloured product. A sensor records the colour reading in arbitrary units as the reaction proceeds.
| time in s | colour reading in arbitrary units |
|---|---|
| 20 | 0.12 |
| 80 | 0.48 |
| 170 | 0.66 |
Calculate how many times greater the mean rate of increase in colour reading is from 20 s to 80 s than from 80 s to 170 s.
122 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.