1. http://www.chem.ufl.edu/~itl/2045/lectures/lec_16.ht ml

2. Molecular Polarity Molecular Polarity depends on: 1. The relative electronegativities of the atoms in the molecule(bond polarity) 2. The shape of the molecule

3. Nonpolar bond => Nonpolar molecule H 2 Two identical atoms do not have an electronegativity difference, the charge distribution is symmetrical, non polar bond. The molecule is non-polar. The electron density plot for H 2.

4. Polar bond=> Polar molecule HCl Chlorine is more electronegative than Hydrogen The electron cloud is distorted toward Chlorine The unsymmetrical cloud has a dipole moment HCl is a polar molecule. The electron density plot for HCl

5. What happens when there is more than one bond? It all depends on the arrangement of these bonds around the central element or elements!!!!!!!

6. Why is water a polar molecule? Water is a bent molecule with polar O-H bonds. The bond dipole moments add to give a resultant dipole directed toward the more electronegative oxygen. A B 2 E CH 4, methane gas is a non polar molecule because all dipoles cancel out.(symmetrical) AB 4

7. What does it mean to be polar?

8. Examples