Lewis Structure and Polarity

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Amy Luu 2G
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Lewis Structure and Polarity

Postby Amy Luu 2G » Thu Nov 21, 2019 1:38 pm

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?

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Re: Lewis Structure and Polarity

Postby KeyaV1C » Thu Nov 21, 2019 4:22 pm

I attached the Lewis structure below. The dipole moments don’t cancel therefore it’s a polar molecule.

Sartaj Bal 1J
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Re: Lewis Structure and Polarity

Postby Sartaj Bal 1J » Fri Nov 22, 2019 11:01 am

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.

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Re: Lewis Structure and Polarity

Postby KMenjivar_3A » Fri Nov 22, 2019 11:06 am

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.

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