Question

which equations do not require balancing

Answer 1

Answer:

If a chemical reaction is not balanced, no information about the relationship between products and reactants can be derived. So the first thing to do when you see a chemical reaction is to balance it. We balance reactions by adding coefficients in front of the reactants and products.

Explanation:

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Answer 2

Answer:

What number do we never change while balancing an equation?

Because the identities of the reactants and products are fixed, the equation cannot be balanced by changing the subscripts of the reactants or the products. To do so would change the chemical identity of the species being described, as illustrated