Explanation:
A chemical reaction in which heat is absorbed by reactants and hence energy of reactants is more than products is known as an endothermic reaction.
For example, [tex]A + B + Heat \rightarrow C + D[/tex] is an endothermic reaction.
Whereas when heat is released by reactants in a chemical reaction then energy of reactants is less than the energy of products. Therefore, this type of reaction is known as exothermic reaction.
For example, [tex]A + B \rightarrow C + D + Heat[/tex] is an exothermic reaction.
Thus, we can conclude that the reaction a b heat → c d is endothermic reaction.
