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Lewis Structure and Polarity

Posted: Thu Nov 21, 2019 1:38 pm
by Amy Luu 2G
2E.27 asks you to predict whether C5H5N is polar or nonpolar.
I started by drawing the lewis structure but it was different than the solution. I drew the 5 carbons connected together with alternating single and double bonds except for one carbon which has single bonds with the two C and one double bond with N. The hydrogens are single bonded to C and N. Is this also a correct lewis stucture?
Also do the dipole moments of C-H cancel out?

Re: Lewis Structure and Polarity

Posted: Thu Nov 21, 2019 4:22 pm
by KeyaV1C
I attached the Lewis structure below. The dipole moments don’t cancel therefore it’s a polar molecule.

Re: Lewis Structure and Polarity

Posted: Fri Nov 22, 2019 11:01 am
by Sartaj Bal 1J
There is only one Nitrogen atom which hints that the molecule is not symmetric. Nitrogen has a greater electronegativity than carbon so it has a greater electron density. These factors help predict that C5H5N is a polar molecule without drawing the Lewis structure.

Re: Lewis Structure and Polarity

Posted: Fri Nov 22, 2019 11:06 am
by KMenjivar_3A
According to the lewis structure there are no lone pairs on either of the carbons and we can see that the hydrogen doesn't cancel out; therefore, the molecule is polar.