14.
a. i, ii, iv, and vi represent elements
b. v and iii represent compounds
15. A chemical formula represents a different chemical substance. It provides a chemical symbol which represents each element present, and a substrict which is the number written below the normal line of letters which indicates how many atoms of the element just to the left of the subscript are in one unit of the substance.
16.
a. Hydrogen (3 atoms), Phosphorus (1 atom), and Oxygen (4 atoms)
b. Sodium (1 atom), Oxygen (1 atom), and Hydrogen (1 atom)
c. Sulfur (1 atom), and Oxygen (2 atoms)
17.
18.
a. NaHCO3 + Hcl → NaCl + H2O + CO2
b. C6H12O6 + O6 → 6 CO2 + 6 H2O
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