A student measures a temperature change in an uncovered polystyrene cup. Which change improves the accuracy of the experiment?
Put a lid on the insulated polystyrene cup
Use a glass beaker instead of a polystyrene cup
Wait ten minutes before reading the final temperature
Use a thermometer with larger scale divisions
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.