In this video we'll introduce the concept of electronegativity -- basically how big of an electron hog each element is and how well it shares with others -- and use it to determine if bonds are nonpolar covalent, polar covalent, or ionic.
Determining If Molecule Is Polar
Even if the individual bonds which make up a molecule are polar, you can still have a molecule which is overall nonpolar because all the little dipoles cancel each other out. In this video we'll use everything we know about Lewis Structures, molecular shape, and electronegativity to determine if molecules are polar.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)