A student investigated the rate of reaction between magnesium ribbon and dilute hydrochloric acid. They measured the cumulative volume of hydrogen gas collected every minute.
Table 1 shows the cumulative volume of gas collected over 5 minutes.
Table 1
| Time / minutes | Cumulative volume of hydrogen gas produced / cm3\text{cm}^3cm3 |
|---|---|
| 0 | 0 |
| 1 | 45 |
| 2 | 68 |
| 3 | 82 |
| 4 | 91 |
| 5 | 95 |
Table 2 shows the rates of reaction calculated from these results.
rate of reaction=volume of gas produced in the 1-minute interval1 minute \text{rate of reaction} = \frac{\text{volume of gas produced in the 1-minute interval}}{1 \text{ minute}} rate of reaction=1 minutevolume of gas produced in the 1-minute intervalTable 2
| Time interval | Rate of reaction / cm3 min−1\text{cm}^3\text{ min}^{-1}cm3 min−1 |
|---|---|
| 0 to 1 minute | 45 |
| 1 to 2 minutes | 23 |
| 2 to 3 minutes | (missing) |
| 3 to 4 minutes | 9 |
| 4 to 5 minutes | 4 |
Calculate the rate of reaction for the time interval 2 to 3 minutes.
127 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.