Question

in order to balance a chemical equation,
which of the following should be changed?
subscripts
the injury was not a stubbed toe.
coefficients
mrs. bio was cleaning a phone screen in the movie theater.
formulas
the injury was not done with chemical poisoning.
elements
mr. chem was cooking in the kitchen.

Explanation:

When balancing a chemical equation, subscripts represent the number of atoms in a molecule and cannot be changed as it would alter the substance. Formulas define the substances involved and also cannot be changed. Elements are fundamental and unchangeable in this context. Coefficients, however, are used to balance the equation by indicating the number of molecules of each substance and can be adjusted.

Answer:

Coefficients