Question

What is exothermic and endothermic reaction

Answer 1

A reaction in which heat energy released is called exothermic reaction
Reaction in which heat energy absorber is endothermic reaction

Answer 2

1. Exothermic reaction = exothermic reactions the reaction in which heat is involved is called an exothermic reaction.When NaOH dissolves in water there is evolution of heat leading to a rise in temperature.
NaOH + H2O -----> NaOH +Heat
2.Endothermic reaction = The reaction in which heat is absorbed is called an endothermic reaction.
When KNO dissolves in water there is absorption of heat during the reaction and the temperature of the solution falls.
KNO + H2O + Heat -----> KNO.