Question

what do you mean by balance and unbalanced chemical equation ?

Answer 1

A balanced chemical equation has equal number of atoms of each type of element on the both sided of equation.this law was proposed by Antoine Lavoisier. While unbalanced chemical equation do not have equal number of atoms on both sides of atoms. It is just a raw or skeletal equation. Hope it helps..

Answer 2

when the number of moles on the reactant side is equal to the number of moles on the product side the reaction is called balanced chemical reaction.
when the number of moles on the reactant side is not equal to number of moles on the product side then the reaction is called unbalanced chemical reaction.