A student is investigating the temperature change during a displacement reaction between iron filings and copper(II) sulfate solution in a polystyrene cup.
State one action the student should perform on the reaction mixture in the cup to ensure the temperature recorded is uniform throughout.
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.