Question

Why in some reactions heat is evolved while some reactions take place only on absorption of heat???
it is from 11 class don't spam give me correct answer

Answer 1

The chemical reactions which occur with the evolution of heat are called exothermic reactions. For example, Heat Heat The chemical reactions which occur with the absorption of heat are called endothermic reactions.

Answer 2

$\huge \mathfrak {Answer:-}$

The heat evolved and absorbed in a reaction is equal to free energy change when change in entropy of a system is zero.

That is,

There is no change in randomness of system.

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