Polarity

(Polar molecules, Non-polar molecules, etc.)

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Ghadir Seder 1G
Posts: 134
Joined: Sat Sep 14, 2019 12:17 am

Polarity

Postby Ghadir Seder 1G » Sat Nov 16, 2019 10:15 pm

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?

Andrew Pfeiffer 2E
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

Re: Polarity

Postby Andrew Pfeiffer 2E » Sat Nov 16, 2019 10:18 pm

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!

Ada Chung 1C
Posts: 55
Joined: Sat Aug 17, 2019 12:15 am

Re: Polarity

Postby Ada Chung 1C » Sat Nov 16, 2019 10:24 pm

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.

HanaAwad_4B
Posts: 45
Joined: Fri Aug 30, 2019 12:18 am

Re: Polarity

Postby HanaAwad_4B » Sat Nov 16, 2019 11:21 pm

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!


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