Question

why does respiration is called exothermic reaction?

Answer 1

For the sustenance of life we require energy. We obtain this energy from our food. In the process of digestion, food molecules get converted into simpler substances such as, glucose. Then glucose combine with oxygen and provide energy to our body. The whole process is known as respiration. As because, energy is released during the process of respiration, so it is considered an exothermic reaction.

For example:-

C₆H₁₂O₆ + 6O₂ —> 6CO₂ + 6H₂O + energy