1. Carbon and oxygen combine to form carbon monoxide (CO) and carbon dioxide (CO 2 ), but these two invisible gases are very different.

2. A prefix tells how many atoms of each element are present in one molecule. PrefixNumberPrefixNumber mono-1hexa-6 di-2hepta-7 tri-3octa-8 tetra-4nona-9 penta-5deca-10 carbon monoxide (CO) carbon dioxide (CO 2 )

3. Molecular Naming Rules: 1) Name elements in formula order. 2) Prefixes show the number of each atom. 3) Suffix of last element is –ide. 4) No prefix mono- for first element. CCl 4 N2ON2O nitrogen oxygendi monide carbon tetrachloride sulfur trioxide SO 3 H2OH2O dihydrogen monoxide

4. 1.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 Quick Quiz!

5. 2.Which of the following molecular compounds is named INCORRECTLY? A.PCl 3 phosphorus trichloride B.C 2 O 5 dicarbon pentoxide C.CF 4 carbon tetrafluoride D.H 3 P hydrogen monophosphide Quick Quiz.

6. 3.The correct formula for hexaphosphorus trisulfide is A.P 7 S 3 B.S 3 P 6 C.P 6 S 3 D.S 3 P 7 Quick Quiz.

7. A prefix tells how many atoms of each element are present in one molecule. PrefixNumberPrefixNumber mono-1hexa-6 di-2hepta-7 tri-3octa-8 tetra-4nona-9 penta-5deca-10