What does one mean by exothermic and endothermic reactions ? Give examples.

Explanation

Chemical reactions that release energy in the form of heat, light, or sound are called exothermic reactions.
Ex : `C(g)+O_(2)(g) to CO_(2)`+HeatEnergy
Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.
`N_(2)(g)+O_(2)(g) overset("heat") to 2NO`