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Energy is conserved in chemical reactions. The total amount of energy in the universe never changes. When a chemical reaction occurs, energy is transferred to or from the reaction’s immediate surroundings.

• in endothermic reactions, energy enters.
• in exothermic reactions, energy exits.

Exothermic reactions

An exothermic reaction transfers energy to its surroundings. The temperature of its surroundings increases.

Exothermic reactions include:

• combustion reactions
• most neutralisation reactions