Bond Polarity

I understood this on the Friday we learned it. However the following week after my brain seemed to just dump it out and made me forget all of it! I had to relearn it again. I think the second time made more sense however. It kinda confused me when the bond itself can be polar because of imbalance of charge and when one atom is more electronegative than the other and then the molecule itself is nonpolar. The trick is to look at the shape since shape determines function. If the bonds are all pointing away from each other they basically cancel out since no one atom sucks the electrons (partial negative - most electronegative atom). Also you have to remember if the shape is polar or nonpolar in general. It got confusing to me no doubt but I finally got it later on. It's a lot to handle that's for sure! But once you have that click it'll all make sense!

Helpful Links! 

Polarity

Bond Polarity and Electronegativity

Second Lecture

The second lecture had me all confused. Resonance and shapes of molecules and electron geometry. Man that was some pretty confusing stuff I'll tell yah! It took me awhile to get but I finally understood it. The shape is just how many bonded entities there are and pay attention to lone pairs. The electron geometry is just where the electrons are found. If you have two bonds and two electron lone pairs the electron geometry is tetrahedral. It took me a bit to piece it all together but I finally got the click and everything came together! Also the online practice tests helped out a lot in helping me understand all of the things we learned. Resonance tripped me up the most though. When we added polar and nonpolar it frazzled my brain as well! No lone pairs=nonpolar. Nonpolar is symmetrical. Polar is just the unsymmetrical shapes with lone pairs. Only polar shapes are trigonal pyramidal and bent molecules.

Above is Resonance 

Helpful Links!

Sigma and Pi Bonds: Hybridization Explained!

Bonding-polar vs nonpolar molecules -keeping it simple

How To Tell if a Bond is Polar or Nonpolar (the super easy way)

Bonding Models and Lewis Structures: Crash Course Chemistry #24

Chemical Bonding

So at first I semi understood the first lecture. It made sense but once I got to the Lewis Dot Structure with have need share and formal charge I got a little confused. But I quickly understood it better when we had that lab in the library. It was fun to draw on the tables! Plus it was good to have models as well and visually see the molecule. Working in groups helped me too. We all collaborated and helped one another out. I hope sometime in the future we can do that again!