A solution containing reactant X is mixed with an excess of a solution containing reactant Y. The reaction produces a gas, which is collected.
Experiments P and Q use the same volumes of both solutions and the same concentration of reactant Y. No catalyst is used. Only the mass of reactant X dissolved in its solution and the temperature may have been changed.
| Time in s | Volume of gas in experiment P in cm3\mathrm{cm^{3}}cm3 | Volume of gas in experiment Q in cm3\mathrm{cm^{3}}cm3 |
|---|---|---|
| 0 | 0 | 0 |
| 10 | 18 | 28 |
| 20 | 34 | 43 |
| 40 | 60 | 54 |
| 60 | 82 | 56 |
| 80 | 92 | 56 |
| 100 | 92 | 56 |
Calculate, in cm3/s\mathrm{cm^{3}/s}cm3/s, the mean rate of gas production during the first 20 seconds for each experiment.
Explain the changes that must have been made to the mass of reactant X and to the temperature in experiment Q. Use the results and collision theory in your answer.
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.