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.
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.
Edexcel GCSE Chemistry Notes
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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.
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