C2.4 Exothermic and Endothermic Reactions

  • Created by: Curlot
  • Created on: 20-03-14 19:26

Exothermic Reactions

Exothermic reactions are accompanied by a temperature rise. They transfer heat energy to the surroundings, i.e they give out heat.

Common examples of exothermic reactions include:

  • neutralising alkalis with acids
  • oxidation
  • combustion
  • self-heating can
  • handwarmers
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Endothermic Reactions

Enothermic reactions are accompanied by a fall in temperature. Heat energy is transferred from the surroundings, i.e they take heat in.

Thermal decompostition and dissolving ammonium nitrate crystals in water are example of endothermic reactions.

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Reversible Reactions

If a reversible reaction is exothermic in one direction then it is endothermic in the opposite direction. The same amount of energy is transferred in each case.(http://revision-systems.co.uk/wp-content/uploads/2013/01/reversible-reaction-symbol.jpg)<- The symbol for a reversible reaction

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