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.<- The symbol for a reversible reaction
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