1. NAMING COVALENT COMPOUNDS

2. WRITING COVALENT COMPOUNDS Same as ionic compounds Identify the less electronegative element 1 st (trend = less EN is the one farthest left & farthest down on Periodic Table) The 1 st nonmetal is just given the name as found on the Periodic Table (just like ionic) The 2 nd nonmetal ending is changed to –ide Difference = numerical prefixes are used to express how many of each nonmetal are present

3. WRITING COVALENT COMPOUNDS (CONT.) The only time you do not use a prefix is when there is only one of the first nonmetal. NumberPrefix 1Mono 2Di 3Tri 4Tetra 5Penta 6Hexa 7Hepta 8Octa 9Nona 10Deca

4. COVALENT COMPOUND PRACTICE SO 2 Cl 2 O 7 NO 2 CCl 4 SF 6 N(BrO 3 ) 5

5. COVALENT COMPOUND PRACTICE Phosphorus Trioxide Tellurium Noniodide Carbon Monoxide Selenium Heptaflouride Arsenic Hexabromide

6. HYDRATES Water is added to the compound  H 2 O Use same pre-fix method for number of hydrates Dinitrogen Pentacarbide tetrahydrate P 4 O 10  8 H 2 O

7. HYDROCARBONS Alkanes are hydrocarbons with single covalent bonds formula C x H 2x+2 suffix “ane.” Alkenes are hydrocarbons with double covalent bonds C x H 2x suffix “ene.” Alkynes are hydrocarbons with triple covalent bonds formula C x H 2x-2 suffix “yne.”

8. Prefixes for Hydrocarbons

9. What is the chemical formula for the following: Butane Butene Butyne An alkyne with 8 carbons Hexene