Exothermic: releases heat to the surroundings, temperature of surroundings increases, e.g. neutralisation, e.g. combustion, e.g. displacement, , ∆H = -ve, Endothermic: takes in heat from the surroundings, temperature of surroundings decreases, e.g. thermal decomposition, e.g. photosynthesis, e.g. dissolving potassium chloride in water, , ∆H = +ve,

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