When balancing a chemical equation, you need to change subscripts to make the number of atoms of an element the same on both sides of the equation.

Question

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When balancing a chemical equation, you adjust the coefficients in front of compounds, not the subscripts, to ensure the number of atoms for each element is the same on both sides of the equation. Changing subscripts would change the compounds themselves.

When Balancing a Chemical Equation, You Need to Change Subscripts