How do we represent chemical reactions?
If you started thinking about element symbols and chemical formulas, you are correct!
WAIT! There is more!
You also need to make sure the number of atoms you begin with is the same number of atoms you end with.
After all, remember, matter is not created nor destroyed, it is only transformed.
Watch this Khan Academy video on balancing chemical equations. As in when chemical reactions happen.
Launch this IXL skill practice, and calculate the amount of reactants and producs.
(Link takes you to IXL site)