The temperature of a solution rises during a reaction. What does this show?
The reaction is endothermic
The reaction is exothermic
Energy is released as bonds are broken
The reaction must be a neutralisation
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.