1. Polar Bonds and Molecules Chapter 8.4

2. Electronegativity Scale

3. If the difference in electronegativity is between
: Non-Polar Covalent
0.4 – 1.0: moderately polar covalent
: very polar covalent bond
>2.0 Ionic Bond

4. Identify the bonds between each atom pair as nonpolar covalent, moderately polar covalent, very polar covalent or ionic.
H and Br
K and Cl
C and O
Cl and F
Li and O
Br and Br

5. Place the following covalent bonds in order from least to most polar:
H-Cl
H-Br
H-S
H-C

6. Polar Covalent Bond vs Non-Polar Covalent Bond

7. Polar Covalent vs Non-Polar Covalent

8. Drawing Bond Dipoles: BF3

9. Drawing Bond Dipoles: CH3OH

10. Net Dipole of Molecules
Dipole – separation of charges within a molecule between two covalently bonded atoms.
Net Dipole – When all the dipole vectors are summed to give one overall dipole.

11. Page 253 Q 31, 35