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Why should chemical formulae not be changed while balancing a chemical equation?

Answer and explanation

Correct answer: Because chemical formulae represent the fixed composition and identity of substances.

A chemical formula shows the elements in a substance and their fixed ratio. Changing a subscript changes the identity of the substance; for example, H₂O is water, whereas H₂O₂ is hydrogen peroxide. Therefore, an equation is balanced by changing coefficients only, because coefficients change the amount of a substance, not its identity.

Related tags

Class 10 ScienceChemical ReactionsChemical EquationsBalancing EquationsChemical Formulae

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