Exothermic reactions transfer energy to the surroundings. Endothermicreactions take in energy from the surroundings.
Reversible reactions are where the products can react to remake the originalreactants. If the forward reaction is exothermic, the reverse reaction is endothermic.
Exothermic Reactions
These are reactions that transfer energy to the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter. The temperature increase can be detected using a thermometer. Some examples of exothermic reactions are:
- burning
- neutralisation reactions between acids and alkalis
- the reaction between water and calcium oxide
Endothermic reactions
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
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