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Chemistry - free strategyWhich equation is balanced?
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Count each kind of atom on both sides; the correct choice has matching totals for hydrogen and oxygen.
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Balance atoms before choosing a coefficient
A chemical equation is balanced when each element has the same number of atoms on both sides.
- Start with H2 + O2 to make H2O.
- Put 2 before H2O to make two oxygen atoms on the right.
- Put 2 before H2 to make four hydrogen atoms on each side.