A student measures the enthalpy change of a displacement reaction between zinc powder and aqueous copper(II) sulfate. The reaction is carried out in a standard glass beaker, and the maximum temperature rise is recorded to calculate the heat energy change.
State one way in which the student could modify the apparatus to reduce the rate of heat energy transfer to the surroundings, thereby improving the accuracy of the temperature change measurement.
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.