A student reacts marble chips with dilute hydrochloric acid and collects the carbon dioxide in a gas syringe.
| Time (s) | 0 | 20 | 40 | 60 | 80 |
|---|---|---|---|---|---|
| Volume of gas (cm3\mathrm{cm^{3}}cm3) | 0 | 28 | 46 | 57 | 62 |
What is the mean rate of reaction between 20 s and 60 s, in cm3/min\mathrm{cm^{3}/min}cm3/min?
0.73 cm3/min0.73\,\mathrm{cm^{3}/min}0.73cm3/min
29.0 cm3/min29.0\,\mathrm{cm^{3}/min}29.0cm3/min
43.5 cm3/min43.5\,\mathrm{cm^{3}/min}43.5cm3/min
57.0 cm3/min57.0\,\mathrm{cm^{3}/min}57.0cm3/min
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.