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While balancing a chemical equation, what must not be changed?

Answer and explanation

Correct answer: Chemical formulae of reactants and products

The chemical formulae of reactants and products must not be changed during balancing, because changing a formula changes the substance itself. Only coefficients placed before formulae are changed so that the number of atoms of each element becomes equal on both sides. For example, \(\mathrm{H_2 + O_2 \rightarrow H_2O}\) is balanced as \(\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\); the formula \(\mathrm{H_2O}\) has not been changed.

Related tags

ScienceClass10Chemical ReactionsChemical EquationsBalancing EquationsConservation Of Mass

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