Completion Stuck on number 7 & 11 on my homewowrk

7)An Equation must never be balanced by changing the _______ in the chemical formula of a substance.

11)If a _______ is used to increases the rate of a chemical reaction its formula is written above the arrow

I think 7 is "subscripts" and 11 is "catalyst."

an equation must never be balanced by changing the

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