A reaction changes colour. A student measures the time taken for the colour change to reach the same stage at different temperatures.
| Temperature in ∘C^\circ\mathrm{C}∘C | Time in s\mathrm{s}s |
|---|---|
| 18 | 144 |
| 28 | 72 |
| 38 | 36 |
Use the results to calculate the relative rate of the reaction at 58 ∘C58\,^\circ\mathrm{C}58∘C.
Give your answer in s−1\mathrm{s}^{-1}s−1.
122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.