Answer:
The energy involved in endothermic and exothermic reactions is Heat.
Step-by-step explanation:
In Endothermic Reactions the energy required to break the bonds is greater than the amount of energy released on bond formation. This required excess energy is absorbed from surrounding in the form of heat. Hence, the temperature of surrounding drops.
While, In Exothermic Reactions the energy required to break the bonds is less than the amount of energy released on bond formation. This excess energy is released to the surrounding in the form of heat. Hence, the temperature of surrounding rises.