During a reaction, 3.6 g of a solid reactant was used up in 90 s. What was the mean rate of this reaction?
0.040 g/s0.040\ \text{g/s}0.040 g/s
324 g/s324\ \text{g/s}324 g/s
25 g/s25\ \text{g/s}25 g/s
0.40 g/s0.40\ \text{g/s}0.40 g/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.