Which change would decrease the rate of the reaction between zinc and dilute sulfuric acid?
Using the same mass of zinc but as larger pieces instead of a fine powder
Increasing the concentration of the sulfuric acid
Heating the sulfuric acid to a higher temperature
Adding a catalyst to the mixture
87 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.