Essential Chemistry for IGCSE - Formulae And Equations (Section 5 - No. 15)
When balancing a chemical equation, what is the one thing you MUST NOT do?
Add coefficients in front of the formulas.
Change the subscripts within the chemical formulas.
Make sure the number of atoms is the same on both sides.
Write the correct formulas for each reactant and product.
Explanation
Changing the subscripts alters the identity of the compound and therefore changes the reaction being represented.
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