A solid reactant, M, reacts with a solution to produce a gas. The same amount of M and the same volume and concentration of solution are used in each experiment. The temperature is also kept the same. Neither reaction has finished after 30 s.
| Experiment | Number of cubes of M | Edge length of each cube in cm | Volume of gas collected after 30 s in cm³ |
|---|---|---|---|
| P | 1 | 2.0 | 16 |
| Q | 64 | 0.5 | 41 |
The surface area of a cube is calculated using:
surface area=6×(edge length)2\text{surface area} = 6 \times (\text{edge length})^2surface area=6×(edge length)2
Calculate the total surface area of M used in each experiment.
Explain why a greater volume of gas was collected in experiment Q after 30 s.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.