Question

What are endothermic and exothermic reactions

Answer 1

endothermic = reaction where heat is involved

exothermic = reaction where heat is evolved

Answer 2

endothermic reaction:

An endothermic process is any process which requires or absorbs energy from its surroundings, usually in the form of heat. It may be a chemical process, such as dissolving ammonium nitrate in water, or simply the melting of ice cubes.

exothermic reaction :

An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy. Exothermic Reaction means "exo" meaning releases and "thermic" means heat.