Exothermic Reactions

Specification Point 7.10:
  • Describe an exothermic change or reaction as one in which heat energy is given out.
  • In exothermic reactions energy is given out to the surroundings so the temperature of the surroundings increases.
  • Combustion, oxidation and neutralisation reactions are typical exothermic reactions.
  • Hand warmers used in the winter time are based on the release of heat from an exothermic reaction.

Endothermic Reactions

Specification Point 7.11:
  • Describe an endothermic change or reaction as one in which heat energy is taken in.
  • In endothermic reactions energy is taken in from the surroundings so the temperature of the surroundings decreases.
  • Electrolysis, thermal decomposition reactions and the first stages of photosynthesis are typical endothermic reactions.
  • Sports injury treatment often use cold packs based on endothermic reactions to take heat away from a recently injured area to prevent swelling.

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Edexcel GCSE Chemistry Notes

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Morgan Curtin Chemistry

Author: Morgan

Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.