Two colourless solutions react to form a coloured product. A student repeats the reaction four times under the same conditions and records the time taken to reach a fixed colour intensity.
| Repeat | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Time in s | 46 | 44 | 45 | 63 |
The result of 63 s is anomalous.
Calculate a mean reaction time using the three consistent measurements.
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.