Answer:
An exothermic reaction is a reaction in which heat is liberated to the surroundings
An endothermic reaction is a reaction in which heat is absorbed from the surroundings
Step-by-step explanation:
Exothermic reaction is one in which heat is liberated to the surroundings.this occurs when the total heat content of the products is less than that of the reactants.
Endothermic reaction is one in which heat is absorbed from the surroundings.this occurs when the total heat content of the products is more than that of the reactants