A chemical equation must be balanced. this means that the same number and type of atoms must appear on both sides of the equation .
In other words, both sides of the reaction have an equal balance of mass and charge. The amount and types of atoms on both sides of the reaction arrow must match for the chemical equation to be balanced.
To comply with the law of conservation of mass, which stipulates that matter cannot be generated or destroyed in a closed system, chemical equations must be balanced.
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