1. WARM UP 1.Compare and contrast Lewis structures and structural formulas. 2.Draw a Lewis structure and a structural formula for CO 2.

2. Naming Covalent Molecules

3. Empirical vs. Molecular Empirical formula –Reduced ratio Names don’t indicate # of atoms –Ionic Molecular formula –Actual number of atoms Names must indicate # of atoms –Covalent

4. Basic Naming First element –Same name Second element –Ending changed to –ide

5. Naming With Prefixes Put a prefix before each name –Indicates number of atoms in formula –Mono- before first atom is omitted 1=mono2=di3=tri 4=tetra5=penta6=hexa 7=hepta8=octa9=nona 10=deca

6. WRAP UP Write the formulas for: –Dihydrogen monoxide –Tetraphosphorus pentabromide –Sulfur hexafluoride

7. WARM UP 1.Name: -C 3 H 7 -PBr 5 -H 2 O -Si 4 Cl 6

8. WRAP UP Draw Lewis structures for the following molecules and name each of them: NH 3 CCl 4 H 2 OHBr