A flask containing a reacting mixture is placed on a balance. Gas escapes from the flask.
| Time (s) | Mass on balance (g) |
|---|---|
| 20 | 156.42 |
| 60 | 155.62 |
Calculate the mean rate of mass loss between 20 s and 60 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.