1. Naming Molecular (Covalent) Compounds NumberPrefix 1mono 2di- 3tri 4tetra 5penta 6hexa 7hepta 8octa 9nona 10deca These are needed because Nitrogen and Oxygen can combine in a number of different ways. N 2 0 NO NO 2 N 2 O 4 N 2 O 5

2. Naming Molecular (Covalent) Compounds NumberPrefix 1mono 2di- 3tri 4tetra 5penta 6hexa 7hepta 8octa 9nona 10deca 1.First word is the name of the element appearing first in a chemical formula, including a prefix indicating how many atoms of that element are present if more than one. 2.Second word ends in ide and also has a prefix indicating the number of atoms present.

3. Nitrogen and Oxygen N 2 0 = Dinitrogen monoxide NO =Nitrogen Monoxide NO 2 Nitrogen Dioxide N 2 O 4 Dinitrogen Tetraoxide N 2 O 5 Dinitrogen Pentaoxide

4. Naming Molecular (Covalent) Compounds NumberPrefix 1mono 2di- 3tri 4tetra 5penta 6hexa 7hepta 8octa 9nona 10deca CO = S0 2 = NO 3 = CF 5 = CO 2 = NO 2 = Nitrogen Monoxide = Dinitrogen trioxide = Carbon Tetrafluoride = Dinitrogen pentoxide = Silicon TetraChloride = Disilicon Hexachloride =

5. Naming Molecular (Covalent) Compounds NumberPrefix 1mono 2di- 3tri 4tetra 5penta 6hexa 7hepta 8octa 9nona 10deca CO =Carbon Monoxide S0 2 = Sulfur Dioxide NO 3 = Nitrogen trioxide CF 5 =Carbon Pentafluoride CO 2 = Carbon Dioxide NO 2 = Nitrogen Dioxide NO = Nitrogen Monoxide N 2 O 3 =Dinitrogen trioxide CF 4 =Carbon Tetrafluoride N 2 O 5 =Dinitrogen pentoxide SiCl 4 = Silicon TetraChloride Si 2 Cl 6 = Disilicon Hexachloride

6. Which of the following compounds is named INCORRECTLY? a)CS 2, carbon disulfide b)BCl 3, boron trichloride c)IF 7, iodine heptafluoride d)PCl 5, phosphorus hexachloride

7. Which of the following molecular compounds is named INCORRECTLY? a)SbCl 3, antimony trichloride b)C 2 O 5, dicarbon pentoxide c)CF 4, carbon tetrafluoride d)H 3 As, hydrogen arsenide