A student monitors the reaction between calcium carbonate marble chips and an excess of dilute hydrochloric acid.
State and explain, in terms of collision theory, how the rate of this reaction changes over time as the reaction proceeds.
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.