Differentiate between exothermic and endothermic reactions.

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Solution

Exothermic Reactions Endothermic Reactions

Chemical reactions which liberate heat are called exothermic reactions. Chemical reactions which absorb heat are called exothermic reactions.

Products have less energy than reactants. Products have more energy than reactants

The surroundings are hotter. The surroundings become cooler.

For example: Magnesium + Hydrochloric acid → Magnesium chloride + Hydrogen + heat
$Mg + 2 HCl \to {MgCl}_{2} + H_{2} + heat$
For example: Potassium permanganate + heat → Potassium manganate + Manganese dioxide + Oxygen
$2 {KMnO}_{4} \to K_{2} {MnO}_{4} + {MnO}_{2} + O_{2}$

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