A student adds a piece of raw potato to hydrogen peroxide solution. Catalase in the potato catalyses the decomposition of the hydrogen peroxide.
The student collects the oxygen produced. The table shows two measurements.
| Time (s) | Volume of oxygen (cm3\mathrm{cm^{3}}cm3) |
|---|---|
| 10 | 8 |
| 40 | 53 |
Calculate the mean rate of oxygen production between 10 seconds and 40 seconds.
Use the equation:
mean rate of reaction=change in volume of gastime taken \text{mean rate of reaction} = \frac{\text{change in volume of gas}}{\text{time taken}} mean rate of reaction=time takenchange in volume of gasGive the unit.
122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.