A student investigated the rate of reaction between calcium carbonate and dilute hydrochloric acid by measuring the volume of carbon dioxide gas produced.
Their results are shown in the table below:
| Time in seconds | Volume of carbon dioxide in cm3\text{cm}^3cm3 |
|---|---|
| 0 | 0 |
| 15 | 18 |
| 30 | 31 |
| 45 | 40 |
| 60 | 46 |
| 75 | 50 |
| 90 | 52 |
| 105 | 52 |
| 120 | 52 |
State why the measurements could have been stopped at 90 seconds.
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.