A student carries out an experiment to measure the temperature change when excess zinc powder is added to 50 cm3 of copper(II) sulfate solution in a polystyrene cup.
State one piece of equipment that should be placed on top of the polystyrene cup during the reaction to minimize heat loss 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.