Question

What are the criterion for a reaction to be exothermic and endothermic

Answer 1

The difference between endothermic and exothermic reactions lies in the words themselves. "Thermic" refers to heat, just as in the word "thermometer." "Exo" means "outside" and "endo" means "inside." Thus, an endothermic reaction pulls heat into an object or area, while an exothermic reaction expels heat.

Answer 2

Answer:

if heat absorbed the reacn is endothermic,if heat evolved the process is exothermic.