A student investigated the rate of reaction between excess hydrochloric acid and calcium carbonate chips. The mass of the reaction flask and its contents was recorded over time using a digital balance to monitor the escape of carbon dioxide gas, as shown in the table below:
| Time / s\text{s}s | Mass of flask and contents / g\text{g}g |
|---|---|
| 0 | 100.00 |
| 10 | 99.15 |
| 20 | 98.60 |
| 30 | 98.22 |
| 40 | 98.00 |
| 50 | 97.85 |
| 60 | 97.75 |
Identify the average rate of reaction, in terms of mass loss per second, during the first 40 seconds of the reaction in g s−1\text{g}\text{ s}^{-1}g s−1.
0.0500.0500.050
0.0220.0220.022
2.452.452.45
20.020.020.0
141 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.