A student added 5.0 g of calcium carbonate to excess dilute hydrochloric acid. The student did this twice, once using one large lump of calcium carbonate and once using a fine powder.
The reaction with the powder was faster than the reaction with the lump.
Explain why.
Both reactions produced the same total volume of carbon dioxide.
Explain why.
41 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.