PolarityThis should be mostly review…

Part 2: Bond Polarity

Electron Density

Part 3: Molecular Polarity

• 3 or more atoms: • Polarity depends on two things:

• Individual bond polarities

• 3D Shape of molecule

• If a molecule is nonpolar, the bond polarities must be the same (not necessarily nonpolar), AND the shape must be symmetric.

THINK SYMMETRY!!!

Population Density: Texas

If electrons were people, and states were molecules…

Population Density: Wyoming

Dipole Moment of China

Vector Math

• See Notes

CO2

BF3

CH4

CH4

CH3Br

Lone Pairs: NH3

H2O

Which of the following molecular shapes are symmetric?

Which of the following molecular shapes are symmetric?

Which of the following molecular shapes are symmetric?

*When Lone Pairs Conflict with Bond PolarityCompare the NH3 you worked on previously to NF3…

Larger Molecules

Surfactants

• Sodium Lauryl Sulfate