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← Chemistry notes
Edexcel IGCSE·Chemistry·IGCSE Chemistry

Energetics

12 min read

Exothermic and endothermic reactions, energy level diagrams, and bond energy calculations.

Exothermic and endothermic

  • Exothermic — releases heat to surroundings; temperature rises; ΔH\Delta HΔH negative (e.g. combustion, neutralisation).
  • Endothermic — takes in heat; temperature falls; ΔH\Delta HΔH positive (e.g. thermal decomposition).

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