What is an exothermic reaction?
A reaction that needs heating to start
A reaction that takes in heat energy from the surroundings
A reaction with no energy change
A reaction that transfers heat energy to the surroundings
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.