Homework #5

13. ( Drawing )

14.
      a. Models: i, ii, iv, vi
      b. Models: iii, v

15. The chemical formula best represents a different chemical substance.

16.
      a. 3 Hydrogen, 1 Phosphorus, 4 Oxygen
      b. 1 Sodium, 1 Oxygen, 1 Hydrogen
      c. 1 Sulfur, 2 Oxygen

17. ( Drawing )

18.  On paper