Four students each mix two chemicals and write down what they observe.
Which observation shows an endothermic reaction?
The beaker feels warm and the thermometer reading rises.
A gas is given off and the thermometer reading stays the same.
The beaker feels cold and the thermometer reading falls.
The mixture glows and the thermometer reading rises.
51 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.