Question

What is a balanced chemical equation? Why should chemical equations be balanced?

Answer 1

A balanced equation is a equation  which has an equal number of atoms of all the elements on both sides of the chemical equation 

Answer 2

if the atom of element in reactants are equal to the atoms of element of product then it is said to be balanced.
it should be balanced becoz of law of conservation of mass which states that matter neither be created nor be destroyed in a chemical reaction.