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Polarity and Number of Bonds

Posted: Wed Nov 20, 2019 9:22 pm
by Amir Bayat
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?

Re: Polarity and Number of Bonds

Posted: Thu Nov 21, 2019 9:22 am
by Justin Sarquiz 2F
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.

Re: Polarity and Number of Bonds

Posted: Thu Nov 21, 2019 9:55 am
by sarahsalama2E
this is a question about polarity: but just wondering would CH2I2 be a polar or nonpolar molecule?

Re: Polarity and Number of Bonds

Posted: Thu Nov 21, 2019 10:06 am
by Daniel Toscano 1L
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.