Question

what is exothermic reaction with one example.

Answer 1

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Here is your answer :-

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The reaction in which the heat is evolved is known as exothermic reaction

For example :-

CaO ( s ) + H20 ( l ) ----------> Ca ( OH )2 ( aq) + heat

Answer 2

The term endothermic process describes the process or reaction in which the system absorbs energy from its surroundings, usually in the form of heat. ... The opposite of anendothermic process is an exothermicprocess, one that releases, "gives out" energy in the form of heat.

These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat-absorbing processes:

melting ice cubes.melting solid salts.evaporating liquid water.converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes)