Chemical reaction is just a rearrangement of atoms. It can neither create nor destroyed during the course of a chemical reaction. Chemical equations must be balanced to satisfy the law of conservation of matter, that states that matter cannot be produced or destroyed in a closed system.
We know the concept of the law of conservation of mass and the law of conservation of energy, which states that mass and energy can neither be created nor be destroyed and they can only be converted from one form to another form.
Similar is the case with balancing chemical equations. Balancing the chemical equation means equating the total number of atoms in both the reactants and products side.
The chemical composition needs to be balanced to make the atomic number of reactants equal to the number of atoms in the product.
This is done to satisfy the "Law of conservation of matter".
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Chemical reaction is just a rearrangement of atoms. It can neither create nor destroyed during the course of a chemical reaction. Chemical equations must be balanced to satisfy the law of conservation of matter, that states that matter cannot be produced or destroyed in a closed system.