Question

What does one mean by endothermic reaction? Give example.

Answer 1

Reactions in which energy is absorbed are known as endothermic reactions.

Example: \[\ce{N2(g) + O2(g) + Heat -> 2NO(g)}\]
\[\ce{2NH3(g) + Heat -> N2(g) + 3H2(g)}\]

Answer 2

A reaction in which heat is absorbed is called an endothermic reaction.
Example: When silver chloride is left in the sunlight, it absorbs heat and turns grey because of the formation of silver metal.

\[\ce{2AgCl(s)->[Sunlight] 2Ag(s) + Cl2(g)}\]