Which statement explains why increasing the pressure of two reacting gases increases the rate of reaction?
The particles gain energy above the activation energy
The particles are closer, so collisions are more frequent
The particles are closer, so collisions need less energy
The particles move faster, so collisions are more energetic
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.