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8.2 Heat energy changes in chemical reactions
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Heat transfer in reactions

Heat transfer in reactions

Comparison showing heat flowing from the reacting system to the surroundings in an exothermic reaction and from the surroundings into the system in an endothermic reaction

Nearly every chemical change transfers heat between the reacting system and its surroundings. A temperature change is evidence that energy has moved, but temperature and energy are not the same quantity.

8.2 Heat energy changes in chemical reactions Lesson

  1. GCSE
  2. /Chemistry
  3. /8.2 Heat energy changes in chemical reactions

Step-by-step lessons 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 builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

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