Question

what does one means by exothermic and endothermic reaction? give example?

Answer 1

Exothermic reactions are reactions that release energy into the environment in the form of heat Eg - reaction that releases energy in any form (e.g., light, sound, heat)

An endothermic reaction occurs when a greater amount of energy is required to break the existing bonds in the reactants than is released when the new bonds form in the products. Eg - photosynthesis

Answer 2

Any type of reaction that produce energy is called exothermic reaction . Like respiration during this process energy is produce . Like burning of coal is also a exothermic reaction.

Endothermic reaction are those reaction which absorb energy like the process of photosynthesis

In this process green plant absorb the sun light energy.