Question

What is endothermic and exothermic reaction ? give differences between them.

Answer 1

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Endothermic reactions : endothermic reactions are those reactions in which heat is involved. all decomposition reactions are endothermic reactions.

Example : 2AgCl --------> 2Ag + Cl2

Exothermic reactions : exothermic reactions are those reactions in which after reaction heat is evolved.

Example : Ca0 + CO2 -------> CaCO3
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Answer 2

1.The chemical reaction in which heat is evolved ( given out ) is called exothermic reaction .
2.The flask becomes warm.
3.Displacement reactions are mostly exothermic reaction in nature.

1.The chemical reaction in which heat is absorbed is called endothermic reaction .
2.The flask becomes cold.
3.Double displacement reaction are endothermic in nature.

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