Two gases, X and Y, are mixed in a sealed container. A molecule of X collides with a molecule of Y, and the two molecules react to form a product.
What can be concluded about this collision?
The molecules reacted, which shows that the reaction is exothermic
The collision energy was at least equal to the activation energy
Every collision between molecules of X and Y forms the product
The collision energy was equal to the energy released as the product formed
85 exam-style questions on AQA GCSE Chemistry 5.1 Exothermic and endothermic reactions, covering 5.1.1 Energy transfer during exothermic and endothermic reactions, 5.1.2 Reaction profiles, and 5.1.3 The energy change of reactions. Each one has a worked solution and a mark scheme showing where the marks go.