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intermolecular forces - January 8th 2009, 08:28 PM

Hey, everyone. I'm doing chem homework but I'm having some trouble.
I'm supposed to predict which of the following have the stronger intermolecular attraction

chlorine or bromine

or

fluorine or hydrogen chloride

I know that dipole-dipole and london forces predict it, but I'm not sure HOW

thanks in advance!
   
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Re: intermolecular forces - January 8th 2009, 08:45 PM

I am not sure about Cl2 and Br2 because both have Van der Waals forces only, if pushed I would say Cl2 has a stronger attraction because there is one less electron shell and thus there is a greater nuclear force from the nucleus of another molecule.

As for F-F or H-Cl this isn't as tough. H-Cl will have more attraction because the highly electronegative Cl atom will cause a permanent dipole with the electrons spending far more time near Cl than H which creates a weak negative charge on Cl and a weak positive one on H. This slightly positive H atom will be electrostatically attracted to the slightly negative Cl giving a stronger force than the Van der Waals exhibited by Cl2
   
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