1. WARM UP 1. Write the shape of: CO2 NH3
2. Describe how you can determine whether a covalent bond is polar or non-polar.

2. The Big Bang Theory

3. Molecular Polarity

4. Polar vs. Non-polar Bonds
Electronegativity difference
Polar molecules .5 or greater
Non-polar molecules less than .5

5. Polar vs. Non-polar Bonds
More electronegative atom = slightly –
Less = slightly +

6. Molecular Polarity Shape is a factor in polarity of whole molecule
Polar molecules have two criteria to meet:
Polar (dipole) bonds
AND
e- being pulled in one direction (dipole moment)

7. Molecular Polarity Non-polar molecules do not meet one polar criteria:
Non-polar bonds OR
Polar bonds pulling e- in equal and opposite directions

8. WRAP UP Are the following bonds polar or non-polar?
CO2 CH4 H2O
What are the geometric shapes of the molecules?
Are these entire molecules polar or non-polar?

9. WARM UP
Write a sentence or two describing all the factors that you need to consider when determining if an entire molecule is polar or not.

10. WRAP UP Are the following bonds polar or non-polar?
NH3 CH2O BCl3
What are the geometric shapes of the molecules?
Are these entire molecules polar or non-polar?

11. WARM UP Determine whether each of the following is polar or non-polar:
NF3
CS2
H2O

12. WRAP UP Determine whether each of the following is polar or non-polar:
PBr3
HCN
CF4

13. WARM UP
“One important key to success is self-confidence. An important key to self-confidence is preparation.” - Arthur Ashe
Do you agree with this? Why?
How does this apply to school?

14. WRAP UP