1. Molecular Polarity
Just like bonds, molecules can be:
polar (have + & - sides) or
non-polar (no charges!)
A Polar molecule has:
 One end with a positive (+) charge
  (+)Na—Cl(-)
*And one end with a negative (-) charge Polar molecules are also called Dipole molecules (2 poles)
A Non-Polar molecule has:
        * No (+/-) charges because the bond polarity is
            balanced (due to shape)
Br-Mg-Br

2. - + Is the Molecule Polar or Non-polar?
Find the VSEPR Shape of the molecule –
Most linear, trigonal planar, & tetrahedral molecules are NON-POLAR!
Most pyramidal and bent molecules are POLAR!
Example 1:  carbon dioxide: Non polar
       
Example 2: Dihydrogen monoxide: Polar
                   - +