A reaction uses up a solid reactant. The mass of reactant remaining is measured at three times.
| Time in s | Mass of reactant remaining in g |
|---|---|
| 0 | 6.40 |
| 30 | 5.68 |
| 90 | 4.96 |
Calculate how many times greater the mean rate of reaction is during the first 30 s than during the next 60 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.