A dissolved reactant R reacts with a dissolved reactant S at a constant temperature. Reactant S is in such a large excess that its concentration remains effectively constant.
The table shows measurements taken as the reaction proceeds.
| concentration of R in mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 | rate in mol dm−3 s−1\mathrm{mol\,dm^{-3}\,s^{-1}}moldm−3s−1 |
|---|---|
| 0.80 | 0.024 |
| 0.60 | 0.018 |
| 0.40 | 0.012 |
Explain the pattern in the results using collision theory.
The reaction continues under the same conditions until the concentration of R is 0.20 mol dm−30.20\,\mathrm{mol\,dm^{-3}}0.20moldm−3.
Calculate the expected rate of reaction.
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.