Question

what is exothermic and endothermic reactions answer soon.............?

Answer 1

endothermic reactions
------------------------------------------------
in a reaction if heat is absorbed then it is called endothermic reactions during this reaction the test tube or a beaker in which the reaction takes place becomes cold 
-----------------------------------------------------------------------------------------------
exothermic reaction
-----------------------------------
in a reaction if heat is released then it is called exothermic reactions during this reaction the test tube or a beaker in which the reaction takes place becomes hot

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 ☺