When you are balancing chemical reactions ('equations'), what must you never touch? the normal-looking numbers to the left of the molecules or compounds. the coefficients, the number in subscript

The correct answer option is: the number in subscript.

Explanation:

When you are balancing any chemical equation, you must never touch or change the number in subscript of the molecule of a chemical or compound.

The number in subscript of any molecule or compound shows the ratio of atoms that makes up that certain molecule or compound.

You can only change or alter the number written left to the molecule of compound to balance the equation.

explanation: no but i do not usually comment

the answer is minerals.