How does a catalyst increase the rate of a reaction?
It gives the reacting particles more energy
It gives a pathway with a lower activation energy
It increases the number of particles in the mixture
It raises the temperature of the reaction mixture
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.