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Why are coefficients, rather than subscripts, changed when balancing a chemical equation?

Answer and explanation

Correct answer: Coefficients change the amount of a substance, not its chemical identity.

Subscripts specify the ratio of atoms in one molecule or formula unit; changing them changes the substance itself. For example, \(\mathrm{H_2O}\) and \(\mathrm{H_2O_2}\) are different substances. Coefficients multiply the number of whole molecules or formula units, so they can adjust the total number of atoms of each element without changing a substance’s identity. Option C is incorrect because a coefficient does not change the number of atoms within a single molecule.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsBalancing EquationsCoefficientsSubscripts

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