Essential Chemistry for IGCSE - Chemical Changes (Section 2 - No. 15)
A reaction is exothermic if:
The products have more energy than the reactants.
The reaction absorbs heat from the surroundings.
The reaction releases heat to the surroundings.
The temperature of the surroundings decreases.
Explanation
An exothermic reaction releases heat to the surroundings, causing the temperature of the surroundings to increase.
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