| How to balance a chemical equation | | The atoms present at the beginning of a reaction merely rearrange to form new molecules. This means that no atoms are lost or gained during any reaction. The chemical equation must therefore be balanced, which means each atom shown in the equation must appear on both sides of the arrow the same number of times. | | For example |  |  | | Typically, reactants and products are represented by their atomic or molecular formulas, but molecular structures or simple names may be used instead. | | Previous | Next |
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