STUFF TO KNOW FOR EXAM 1, 22005

 

Major goal of Gob 1 was to give you a better idea of how molecules were bonded together.

Chapter 1
1. noble gas rule
2. Lewis structure/formal charges
3. “typical” valence determination
4. definition of orbital
5. The Aufbau order and use in assigning ground state e- configuration
6. LCAO approximation and its use in forming M.O.’s
7. sign conventions for orbital overlap (bonding and antibonding)
8. construction of hybrid atomic orbitals
9.. determination of hybridization for various atoms
10. sigma vs. pi bonds
11. use of orbital energy diagrams to determine if net bonding occurs
12. M.O. pictures of the bonding in various small molecules
13. Bond angle estimation

Chapter 2
1. ionic vs. covalent bonding
2. electronegativity - definition and use in determining bond polarity
3. Use of bond dipole vectors to qualitatively determine overall dipole moment

Chapter 3
1. functional groups - definition and identification

2.  alkane and cycloalkane nomenclature
3. Alkane physical properties, especially bp trends in  nonpolar alkanes (London forces).
4. acyclic alkane conformational issues (staggered vs.  eclipsed, anti, gauche, estimation of energy costs, I'll provide numbers if needed)

Chapter 4

1. Newman vs. sawhorse projections
2. Cyclic alkanes and conformation (sources of ring  strain-torsional, angle, steric)
3. Chair conformations and all the stuff that goes with it  (axial vs. equatorial, effect of substituents, interconversions, energy  estimations)

Study hard over multiple days for best results on organic exams. Types of problems will be very similar to exam 1 from 22001 (Lewis structures, definitions, short answer, mechanism issues, ID of functional groups, multiple choice........). We will have help session Thursday nite at 7:00 (G-40) - come with questions. Feel free to come by with questions anytime or call me (see syllabus for #’s). Test will start right at 9 on Friday and will end at 10:10.