Question

Can someone help me with Chemistry? I need some help. Which reactions are endothermic?

Answer 1

when deta H of the reaction it is called endothermic reaction!!!!if it is negative it is called exotermic reaction!!!!

Answer 2

if u are not provided delta H then by this u can identify by looking reaction...
A.. all endothermic rexn are dissociation reaction but this rexn is excptn u have to learn it
1/2N2 + 1/2 O2-----> NO2 etc
B. all formation reaction is exothermic reaction here also this is exception
NO2-------->1/2 N2 + 1/2 O2 etc.

there are more exceptions for both reaction but these are famous exmaples most commonly asked