Energy is transferred when bonds are broken and made when a chemical reaction takes place. 'Exothermic' reactions transfer energy to the surroundings. The energy transferred often heats up up the surroundings and so the temperature increases.
Examples of exothermic reactions are: Combustion such as burning fuels and metals, respiration and neutralisation
Endothermic reactions transfer energy from the surroundings. Some cause a decrease in temperature and others require a supply of energy. When some solid compounds are mixed with water, the temperature decreases because endothermic reactions happen. Thermal decomposition reactions need a supply of heat to keep going. Photosynthesis is an important endothermic reaction that uses light energy.
Endothermic reactions take in heat.
Heat exits (transforms from) exothermic reactions.
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