A metal carbonate reacted with dilute acid in a flask on a balance, and carbon dioxide escaped. The mass of the flask and its contents decreased by 960 mg in 80 s. What was the mean rate of mass loss in g/s\text{g/s}g/s?
12 g/s12\ \text{g/s}12 g/s
1.2×104 g/s1.2 \times 10^4\ \text{g/s}1.2×104 g/s
0.12 g/s0.12\ \text{g/s}0.12 g/s
0.012 g/s0.012\ \text{g/s}0.012 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.