13.
14. Represent elements: i, ii, iv, and vi
Represent Compounds: iii, v
15. A chemical formula represent the elements contained in a substance, together with subscripts that indicate the relative numbers of atoms of each element.
16. a. Phosphoric Acid: 3 hydrogen atoms, 1 phosphorus atom, 4 oxygen atoms
b. Sodium Hydroxide: 1 sodium atom, 1 oxygen atom, 1 hydrogen atom
c. Sulfer dioxide: 1 Sulfer atom, 2 oxygen atoms
17.
18. a. NaHCO3 + HCl -----> Nacl + H2O+ CO2
b. C6H12O6+06-----> 6 CO2 + 6 H20
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