1. Control of Structure
Why do elements and compounds adopt one structure as opposed to another?

2. Thermodynamics Review:
G = H - TS
Bond Strength
Favored by strong bonds.
Freedom of Movement
Favored by more particles.
Temperature Control?

3. Thermodynamics Review:
G = H - TS
Bond Strength
Favored by strong bonds.
Freedom of Movement
Favored by more particles.
Example: Cl-Cl vs. Cl Cl
Cl-Cl bond strength = 242 kJ/mol
So (Cl) = 165 J/Kmol
So (Cl2) = 223 J/Kmol

4. Bonding Concerns and Trends:
Number of bonds
Type of bonds: sigma vs. pi

5. Number of Bonds Possible: F, O

6. Number of Bonds Possible: N, C

7. Lewis Base Activity Expands # Bonds

8. sigma vs. pi bonding: Lewis structure examples

9. Shapes of sigma and pi bonds

12. sigma vs. pi bonding: shapes, strength and trends