Marble chips react with dilute hydrochloric acid. The total volume of gas collected is recorded.
| Time in s | Total volume of gas in cm3\mathrm{cm^{3}}cm3 |
|---|---|
| 0 | 0 |
| 20 | 28 |
| 40 | 48 |
| 60 | 62 |
| 80 | 70 |
| 100 | 72 |
What is the mean rate of reaction between 20 s and 60 s?
0.57 cm3 s−10.57\,\mathrm{cm^{3}\,s^{-1}}0.57cm3s−1
0.85 cm3 s−10.85\,\mathrm{cm^{3}\,s^{-1}}0.85cm3s−1
1.03 cm3 s−11.03\,\mathrm{cm^{3}\,s^{-1}}1.03cm3s−1
1.20 cm3 s−11.20\,\mathrm{cm^{3}\,s^{-1}}1.20cm3s−1
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.