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This lesson covers exothermic reactions — reactions that release energy to the surroundings — including examples, temperature changes, everyday uses and energy profile diagrams as required by the Edexcel GCSE Combined Science specification (1SC0).
An exothermic reaction is one that transfers energy to the surroundings, usually as heat. The temperature of the surroundings (and the reaction mixture) increases.
| Term | Meaning |
|---|---|
| Exothermic | "Exo" = out; "thermic" = heat. Energy is released |
| Temperature change | The temperature of the surroundings rises |
| Energy transfer | From the chemical system to the surroundings |
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