Explain the terms with examples :
Exothermic reaction

Explanation

Exothermic reaction : The process in which heat is given out is called an exothermic reaction .
When `NaOH_((s))` dissolves in water, there is evolution of heat leading to a rise in temperture.
`NaOH_((s))+H_(2)O_((1))rarrNaOH_((aq))+"Heat"`