1. THE BOOKSTORE NOW HAS CLICKERS! CHAPTERS 1 & 2 POSTED ON COURSE WEBSITE HOMEWORK- CHAPTER 2 NOW POSTED, DUE 9/6 NOTE-TAKER REQUEST DON’T FORGET: LAB THIS WEEK- PRINT EXPERIMENTS, DO PRE-LAB CHEMISTRY HELP CENTER- GRAPHING ASSIGNMENT Announcements

2. Groups with Names

3. Periodic Table

4. Where are we going from here?

5. Element Structures

6. Element Structures- Allotropes

7. Element Structures- Sulfur Allotropes

8. Where are we going from here?

9. Covalent Compounds Atoms of different elements held together by covalent bonds  Molecular covalent- individual molecules  Network covalent- large network of atoms Graphene resting on a silicon dioxide substrate layer

10. Molecular Covalent Compounds nonmetal + nonmetal = molecular compound  C + O : CO, CO 2  S + H : H 2 S  C + H : CH 4

11. Types of Formulas

12. GLUCOSE ACETIC ACID Examples

13. Naming Molecular Compounds Binary compounds- 2 different elements Name first element, using full name Name second element, adding –ide Use prefixes to indicate # of atoms  Only use prefix for first name if >1 atom  Always use prefix for second element Examples  CO N2ON2O  BF 3 #Prefix 1mono- 2di- 3tri- 4tetra- 5penta- 6hexa- 7hepta- 8octa- 9nona- 10deca- Exception: Some materials have common names (e.g. H 2 O=water, NH 3 =ammonia)

14. Where are we going from here?