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Changing a subscript in a correctly written chemical formula
changes the number of moles represented by the formula.
changes the formula so that it no longer represents that compound.
has no effect on the formula.
changes the charges on the other ions in the compound.
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Answer: changes the formula so that it no longer represents that compound.
Reason: subscripts show the number of atoms of each element in a formula unit; altering a subscript changes the stoichiometry and thus the identity of the compound (e.g., H2O → H2O2 changes water to hydrogen peroxide). Subscripts are not charges (charges are superscripts), and you should not change subscripts to “balance” charge — use coefficients in equations instead.
Reason: subscripts show the number of atoms of each element in a formula unit; altering a subscript changes the stoichiometry and thus the identity of the compound (e.g., H2O → H2O2 changes water to hydrogen peroxide). Subscripts are not charges (charges are superscripts), and you should not change subscripts to “balance” charge — use coefficients in equations instead.
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