These are reactions that take in energy from the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder. The temperature decrease can also be detected using a thermometer.
Some examples of endothermic reactions are:
- Electrolysis
- The reaction between ethanoic acid and sodium carbonate
- The thermal decomposition of calcium carbonate in a blast furnace
Endothermic reactions can be used for everyday purposes. For example, certain sports injury cold packs use endothermic reactions.
The animation shows an exothermic reaction between sodium hydroxide and hydrochloric acid, and an endothermic reaction between sodium carbonate and ethanoic acid.
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