A student collected gas during a reaction. The volume of gas collected was recorded at two times.
| Time in s | Volume of gas collected in cm³ |
|---|---|
| 20 | 36 |
| 80 | 108 |
Calculate the mean rate of this reaction between 20 s and 80 s.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.