A student carried out an experiment to measure the energy released when a fuel is burned. The temperature of the water in the calorimeter increased by 28.5∘C28.5^{\circ}\text{C}28.5∘C.
The heat energy transferred to the water can be calculated using the equation:
heat energy (J)=420×temperature rise \text{heat energy (J)} = 420 \times \text{temperature rise} heat energy (J)=420×temperature riseCalculate the heat energy transferred to the water in joules.
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.