How can we say that a reaction is exothermic or endothermic?
Give some examples of both type of reactions.

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Solution

Exothermic reaction Endothermic reaction

Exothermic reaction are the one in which heat energy is released. So if heat is liberated such reactions are exothermic reactions Endothermic reaction are the one in which heat energy is absorbed. So if heat is absorbed then we can say that such reactions are endothermic reactions.

Exo means release Endo means absorb

Delta H is negative
( delta H = H_P - H_R) Delta H is positive

Energy of reactant is more than the product Energy of product is more than reactant

Ex., Photosynthesis, evaporation Ex., Respiration, combustion

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Exothermic reaction	Endothermic reaction
Exothermic reaction are the one in which heat energy is released. So if heat is liberated such reactions are exothermic reactions	Endothermic reaction are the one in which heat energy is absorbed. So if heat is absorbed then we can say that such reactions are endothermic reactions.
Exo means release	Endo means absorb
Delta H is negative ( delta H = H_P - H_R)	Delta H is positive
Energy of reactant is more than the product	Energy of product is more than reactant
Ex., Photosynthesis, evaporation	Ex., Respiration, combustion