Question

What are endothermic and exothermic changes ?​

Answer 1

Answer:

All chemical reactions involve the transfer of energy. Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy. Exothermic processes release energy upon completion, and are signified by a negative change in enthalpy.

Answer 2

Answer:

Endothermic reaction is a processes that does an input of energy to proceed and are signified by a positive change in enthalpy.

Exothermic reaction is a processes that releases energy upon completion, and are signified by a negative change in enthalpy.