In an experiment to measure the energy released by burning a fuel, the temperature of the water increased by 28.4∘C28.4^{\circ}\text{C}28.4∘C. The heat energy transferred can be calculated using:
heat energy (in J)=420×temperature rise \text{heat energy (in J)} = 420 \times \text{temperature rise} heat energy (in J)=420×temperature riseCalculate the heat energy transferred to the water.
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.