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What must not be changed while balancing a chemical equation?

Answer and explanation

Correct answer: Subscripts in chemical formulae

Subscripts in chemical formulae must not be changed while balancing an equation, because changing a subscript changes the identity of the substance. For example, changing \(\mathrm{H_2O}\) to \(\mathrm{H_2O_2}\) changes water into hydrogen peroxide. An equation is balanced only by placing coefficients before formulae, so the number of molecules or moles and the quantitative ratio may change.

Related tags

Class 10 ScienceChemical ReactionsChemical EquationsBalancing EquationsChemical Formulae

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