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8.2.1 Exothermic and endothermic changes
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Heat energy changes

Heat energy changes

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 energy between the reacting mixture, called the system, and its surroundings.

8.2.1 Exothermic and endothermic changes Lesson

  1. GCSE
  2. /Chemistry
  3. /8.2.1 Exothermic and endothermic changes

Step-by-step lessons on Edexcel GCSE Chemistry 8.2.1 Exothermic and endothermic changes. 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.

Lessons