How does a catalyst increase the rate of a chemical reaction?
It increases the average kinetic energy of the reacting particles.
It provides an alternative reaction pathway with a lower activation energy.
It increases the frequency of collisions by increasing the concentration of reactants.
It lowers the overall enthalpy change (ΔH\Delta HΔH) of the reaction.
31 exam-style questions on OCR GCSE Chemistry Controlling reactions. Each one has a worked solution and a mark scheme showing where the marks go.