Polarity and Number of Bonds

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

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Amir Bayat
Posts: 115
Joined: Sat Sep 07, 2019 12:16 am

Polarity and Number of Bonds

Postby Amir Bayat » Wed Nov 20, 2019 9:22 pm

If one atom of a molecule that has the same number of atoms all around has a double bond or more, does it have a larger dipole moment, making the molecule polar? For instance, NO3-? I understand NO3 is an atom, but generally speaking, does the double bond on one of the oxygen atoms make the whole molecule polar as it has a larger dipole moment or does the double bond not mean anything?

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: Polarity and Number of Bonds

Postby Justin Sarquiz 2F » Thu Nov 21, 2019 9:22 am

The type of bond does not really matter when determining polarity of the molecule. We look at the electronegativities of the atoms to determine whether a molecule is polar or not.

Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

Re: Polarity and Number of Bonds

Postby sarahsalama2E » Thu Nov 21, 2019 9:55 am

this is a question about polarity: but just wondering would CH2I2 be a polar or nonpolar molecule?

Daniel Toscano 1L
Posts: 95
Joined: Tue Nov 13, 2018 12:18 am

Re: Polarity and Number of Bonds

Postby Daniel Toscano 1L » Thu Nov 21, 2019 10:06 am

I think a double bond will make the molecule more polar, say in C=O compared to C—O, as the C=O has a π bond. But for NO3-, the resonance hybrid structure would have it's partial charges cancel out, resulting in a nonpolar molecule.

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