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Polarity

Posted: Sat Nov 16, 2019 10:15 pm
by Ghadir Seder 1G
Can you relatively know if a molecule is polar or nonpolar simply by looking at the molecular formula? Or do you have to draw the lewis structure of the molecule to do so?

Re: Polarity

Posted: Sat Nov 16, 2019 10:18 pm
by Andrew Pfeiffer 2E
In most scenarios, you'll be able to give a good guess right off the bat based on the electronegativity difference between the molecules in question. However, you should always draw the Lewis structure, because dipole moments might cancel out resulting in a non-polar molecule. Hope this helped!

Re: Polarity

Posted: Sat Nov 16, 2019 10:24 pm
by Ada Chung 1C
Yes, you usually can tell if a molecule is polar or not depending on its geometry. If it is symmetrical than usually, the dipoles are able to cancel and will leave the overall molecule uncharged.

Re: Polarity

Posted: Sat Nov 16, 2019 11:21 pm
by HanaAwad_4B
Initially, you should have a pretty good idea as to whether or not a molecule is polar based on electronegativity differences, however polar bonds can be canceled out by geometry. To be sure, I always draw the lewis structure because it helps me, but if you are confident without drawing it than that works too!