Question

how will you represent a exothermic and endothermic nature of chemical reactions​

Answer 1

Endothermic reactions absorb energy, and exothermic reactions release energy. The law of conservation of energy states that matter cannot be created or destroyed. Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction.

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Answer 2

this can be shown by practically.

for endothermic reaction making of food is good example.

for exothermic reaction burning of coal is good example