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A balanced equation is an equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. Law of conservation of mass governs the balancing of a chemical equation.
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The way you can tell if an equation is unbalanced is by looking at the number of atoms in each formula on each side

Ex: Cu + Cl -> CuCl2 = unbalanced
Cu + 2Cl -> CuCl2 = balanced

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