Question

What is balanced chemical equation? why should chemical equations be balanced?

Answer 1

A balanced chemical equation is an equation in which the number of atoms of each element of the reactant is equal to that of the product.

chemical equation should be balanced in order to maintain the law of conservation of energy according to whi h matter is neither created nor destroyed , it is only tranformed from one form to another.

example-
unbalanced equation-
CH4 + Cl2 ------->CCL4 + HCL

balanced equation-

CH4 + 4Cl2-------> CCl4 + 4HCL

Answer 2

chemical equation :- this is a type of equation by which we express any chemical phenomena .
example :- when sodium react with water form sodium hydroxide and evolve hydrogen gas .
this phenomwna we can also write in equation.
e.g Na + H2O → NaOH + H2

now,
balance chemical equation :- according to Lavoisier's Law of conservation of mass , mass of reactant = mass of product . this means substances are not destroyed only convert one form to another . but how is this possible ???
this answer is balance chemical equation . this is a most important term in chemistry , without balancing we can't know, how much product will be formed and how much reactant would be consumed.