1. Unit 9: Covalent Bonding
Chapters 8 & 9
Chemistry 1L
Cypress Creek High School

2. WARNING!!!!!!!
Just because you have polar bonds, DOESN’T MEAN YOU ARE A POLAR MOLECULE.

3. Polar Molecules
The effect of polar bonds on the polarity of the entire molecule depends on the molecule shape

4. Polar & Nonpolar Molecules
Polar molecules have a partial positive and partial negative charge – called a dipole
Molecules are considered polar if they:
Have an asymmetrical shape
Some reasons for asymmetricl shape include
Has a lone pair of electrons
Has Polar Bonds AND has different elements around the central atom

5. SYMMETRICAL MOLECULES
This molecule is non-polar due to the symmetrical shape of the molecule but it does contain polar bonds. YOU CAN HAVE A NON-POLAR MOLECULE AND POLAR BONDS!!! H
Polar bonds H C H H

6. NON-SYMMETRICAL MOLECULES
The electrons are no longer being pulled with equal force nor in equal directions. H H C Cl H
Different elements

7. Polar Molecule Practice
Is this Polar or Non Polar?
Non-Polar
H Cl + -

8. Polar Molecule Practice
Is this Polar or Non Polar?
Non-Polar
BF3 F B

9. Polar Molecule Practice
Is this Polar or Non Polar?
Polar
net
dipole
moment
H2O H O

10. Polar Molecule Practice
Is this Polar or Non Polar?
Polar
CHCl3 H Cl
net
dipole
moment

11. Polar & Nonpolar Molecules
*IMPORTANT: Polar & nonpolar molecules are different from polar & nonpolar bonds!!!
Non-polar molecules have charges that are evenly distributed, due to shape (ex: any diatomic molecule, gasoline)
Polar molecules have a partial positive and a partial negative charge (ex: water)