Problem 3F.5

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Brittney Hun 2C
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Joined: Wed Sep 11, 2019 12:15 am

Problem 3F.5

Postby Brittney Hun 2C » Wed Nov 13, 2019 7:35 pm

I know the boiling point is higher for CHI3 than it is for CHF3 because CHI3 is the larger molecule so the dispersion forces are stronger and greater. But since Fluorine is more electronegative does that play any role in the strength of the forces, since it attracts the CH to it?

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Joined: Thu Jul 25, 2019 12:15 am

Re: Problem 3F.5

Postby 005391550 » Wed Nov 13, 2019 9:09 pm

well i think for intermolecular forces we look at size because the larger atom means a bigger electron density which results in an easily distortable electron cloud. This leads to stronger dipole moments and stronger intermolecular forces. But for electronegativity, i think it plays more of a role in bonds between atoms

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Re: Problem 3F.5

Postby Mashkinadze_1D » Wed Nov 13, 2019 9:30 pm

This question was asked to Doctor Lavelle today during office hours. He stated that because the difference in size and therefore electron cloud between fluorine and iodine is so large, that it over-arches the difference in electromagnetically. This is a good example of just how strong induced-dipole-induced-dipole forces can really get when the molecules are large in size and have a lot of electrons to be distorted.

Jialun Chen 4F
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Joined: Sat Sep 07, 2019 12:16 am

Re: Problem 3F.5

Postby Jialun Chen 4F » Thu Nov 14, 2019 1:36 am

The dominant force to be considered in 3F 5(c) is the dipole-dipole force, which depends on the size of the molecule; since Iodine is larger than Fluorine, Iodine experience higher diploe moment, which results in a stronger dipole-dipole force.

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