Question

How to tell if a reaction is endothermic or exothermic by looking at it?

Answer 1

if the enthalpy of the reaction is positive then it is endothermic and if the enthalpy of the reaction is negative then it is exothermic !!!
Hope it will be helpful !!!

Answer 2

Hello Dost ☺

Answer :

Exothermic reaction and endothermic reaction:

On the basis of energy changes during chemical reaction, they can be classified as

i) Exothermic reaction: A chemical reaction in which heat energy is produced.

Eg : C + O2 → CO2 (g) + heat

ii) Endothermic reaction: A chemical reaction in which heat energy is absorbed.

Eg : CaCO3 + Heat → CaO + CO2

Thanks ☺