Reactions can either be exothermic or endothermic.
An exothermic reaction is one that gives out energy to the surroundings, usually in the form of heat. Exothermic reactions are shown by a rise in temperature.
An endothermic reaction is one that takes in energy from the surroundings, usually in the form of heat. Endothermic reactions are shown by a drop in temperature.
In all chemical reactions old bonds are broken so that new bonds can be formed. Energy needs to be supplied to break bonds, which makes bond breaking endothermic. Energy is released when new bonds are formed, which makes bond formation exothermic.
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