balanced chemical equation explain?

We know that the law of conservation of mass states that mass can neither be created nor destroyed. Thus, in a chemical reaction, the total mass of the reactants should be equal to the total mass of the products. This means that the total number of atoms of each element should be equal on both sides of a chemical equation. Such an equation is called a balanced chemical equation, and the method by which it is obtained is called balancing of chemical equations. Hence

An equation having an equal number of atoms of each element on both the sides is called a balanced chemical equation. 

For more reference on balanced chemical equations, please refer to the following link

http://icse.meritnation.com/study-online/study-material/svh$hgoOGeQNoQQVQWBLCQ!!/e$xAJgya91Obd5NGBpUQDg!!

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As per the NCERT syllabus of science for class 7th, balancing of chemical equations is not a part of the course. You will learn about it in complete detail in class 10th. However balancing a chemical equation is very simple. One has to only make sure that number of atoms of all the elements on both the sides of the equation are the same. This is in accordance with the law of conservation of mass that the total mass of elements present in the products of a chemical reaction has to be equal to the total mass of elements present in the reactants.

Hence the number of atoms of each element remains the same before and after a chemical reaction.

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