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While balancing a chemical equation, if a student changes a subscript in the formula of water, \(\mathrm{H_2O}\), what mistake has been made?

Answer and explanation

Correct answer: The composition and identity of the substance change.

Subscripts show the number of atoms of each element in a chemical formula. Changing the subscript 2 in \(\mathrm{H_2O}\) changes the composition, so the substance is no longer water. An equation is balanced by changing coefficients placed before formulae, not by changing subscripts within them.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsBalancing EquationsSubscripts

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