1. N AMING C OVALENT C OMPOUNDS

2. W RITING C OVALENT C OMPOUNDS Made of two or more nonmetals 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 (just like ionic…don’t change polyatomics) Difference = numerical prefixes are used to express how many of each nonmetal are present

3. W RITING C OVALENT C OMPOUNDS ( CONT.) You never use “criss-cross” method 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. C OVALENT C OMPOUND P RACTICE SO 2 N2ON2O NO 2 CCl 4 Cl 2 O 7 PCl 3 SF 6 Si 3 N 4 N(BrO 3 ) 5 H2OH2O Sulfur Dioxide Dinitrogen Monoxide Nitrogen Dioxide Carbon Tetrachloride Dichlorine Heptaoxide Phosphorus Trichloride Sulfur Hexaflouride Trisilicon Tetranitride Nitrogen Pentabromate Water - can use common name

5. C OVALENT C OMPOUND P RACTICE Phosphorus Trioxide Dinitrogen Pentacarbide Tellurium Noniodide Carbon Monoxide Selenium Heptaflouride Tetraphosphorous Decoxide Arsenic Hexabromide Silicon Dichloride PO 3 N2C5N2C5 TeI 9 CO SeF 7 P 4 O 10 AsBr 6 SiCl 2

6. P ROPERTIES OF C OVALENT C OMPOUNDS 1) low melting and boiling points 2) cannot conduct heat or electricity 3) Not soluble in water, soluble in alcohol

7. P ROPERTIES OF IONIC BONDS 1) high melting points and boiling points (not higher than metals) 2) conduct electricity in liquid phase only 3) soluble in water, not alcohol

8. P ROPERTIES OF METALS 1) have high melting and boiling points 2) conduct electricity in liquid and solid phases 3) not soluble