Polar and Nonpolar

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Claudeth Martinez 1D
Posts: 52
Joined: Fri Sep 28, 2018 12:18 am

Polar and Nonpolar

Postby Claudeth Martinez 1D » Sun Nov 04, 2018 11:28 pm

hello,

Does anyone how I can tell when a molecule is polar or nonpolar?

Haowen_Liang_3E
Posts: 20
Joined: Fri Apr 06, 2018 11:03 am

Re: Polar and Nonpolar

Postby Haowen_Liang_3E » Sun Nov 04, 2018 11:39 pm

It comes down to if the molecule has charged regions (e- spending more time near one atom instead of both), and if charge regions are positioned to balance the charge (example: two (-) charged atom on either side of a (+) charged atom).

Rachel Dang 1H
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

Re: Polar and Nonpolar

Postby Rachel Dang 1H » Tue Nov 06, 2018 12:39 pm

You can calculate polar and non-polar with electronegativity levels since that will reveal whether an electron is shared unequally or not. For the most part diatomic molecules are non-polar.

Rachel Yoo 1F
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

Re: Polar and Nonpolar

Postby Rachel Yoo 1F » Thu Nov 08, 2018 12:50 am

Polar bonds have an unequal sharing of electrons while nonpolar bonds do have equal sharing

MadisonB
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Polar and Nonpolar

Postby MadisonB » Thu Nov 08, 2018 1:06 am

Polar: there is an uneven distribution of charge

Nonpolar: there is a completely symmetric distribution of charge

Video explaining this: https://www.youtube.com/watch?v=SiZXRScxbl0

Mallory_Podosin_1H
Posts: 31
Joined: Fri Sep 28, 2018 12:15 am

Re: Polar and Nonpolar

Postby Mallory_Podosin_1H » Thu Nov 08, 2018 6:54 pm

Kind of an extension of this question - so the only way to have a nonpolar covalent bond would be if the electronegativity is the same meaning the same element?

g orloff 1J
Posts: 45
Joined: Fri Sep 28, 2018 12:16 am

Re: Polar and Nonpolar

Postby g orloff 1J » Thu Nov 08, 2018 7:23 pm

it also has to do with the shape of the molecule with one side having the opposite charge compared to the other side. A non polar molecule will have a symmetrical charge across the molecule.

Xinyi Zeng 4C
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Polar and Nonpolar

Postby Xinyi Zeng 4C » Thu Nov 08, 2018 8:40 pm

The greater the electronegativity difference between the two atom, the more polar the bond is. Usually a covalent bond formed between two different atoms will be polar, except for covalent bonds formed between C/S/H/P as they have similar electronegativities.
If there is polar bond present in the molecule, then we will have to determine the shape of molecule using the Valence Shell Electron Pair Repulsion Theory (which I believe we will learn soon). Once we know the shape of the molecule, we will know whether there is an overall dipole moment, if there is, then the molecule is polar.


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