A student compares two reaction mixtures, P and Q. Both mixtures give off a gas.
For each repeat, the student records the time taken to collect 30 cm330\,\mathrm{cm^{3}}30cm3 of gas in a gas syringe.
| Reaction mixture | Repeat 1 time (s) | Repeat 2 time (s) | Repeat 3 time (s) | Repeat 4 time (s) |
|---|---|---|---|---|
| P | 59 | 78 | 61 | 60 |
| Q | 41 | 39 | 55 | 40 |
Ignore any anomalous results.
Calculate how many times greater the relative rate of mixture Q is than the relative rate of mixture P.
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.