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A chemical equation is balanced by changing or adding

a.

chemical symbols.

c.

numbers in front of molecules.

b.

subscripts after atoms.

d.

reactants in the product.

Verified Answer :

Greenleafable

A chemical equation is balanced by changing or adding C. numbers in front of molecules, which are called coefficients. 
For example:
O2 + 2 H2 ---> 2 H2O (number 2 is added to both sides in order to balance the equation)

cjvggs

Answer:

a.

chemical symbols.

Explanation:

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