London Van Der Waals Force?

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Nathan Tran 4K
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Joined: Fri Sep 28, 2018 12:16 am

London Van Der Waals Force?

Postby Nathan Tran 4K » Mon Nov 12, 2018 10:06 pm

I recall my TA saying that all molecules undergo London Van Der Waals Forces in some way, and that for example, diploe-dipole forces are just stronger forces of this nature. What exactly are these London Van Der Waals Forces and are they synonymous to dispersion and induced diploe-induced dipole forces?

A De Castro 14B 2H
Posts: 75
Joined: Fri Sep 28, 2018 12:29 am

Re: London Van Der Waals Force?

Postby A De Castro 14B 2H » Mon Nov 12, 2018 10:11 pm

London Van Der Waals Forces are fluctuating dipoles that result from fluctuating electron distributions, due to electrostatic interactions between molecules. They are always present and attractive. Yes, according to Dr. Lavelle's lecture, they are synonymous to dispersion and induced dipole-induced dipole forces.

Jake Gordon 1A
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Joined: Fri Sep 28, 2018 12:15 am

Re: London Van Der Waals Force?

Postby Jake Gordon 1A » Mon Nov 12, 2018 10:30 pm

As stated above they are also called dispersion LDF VDW and others.
They occur in all molecules and are the weakest Inter molecular force
They occur because at any given moment there is a possibility that the electron density is higher on one side of the molecule than another and this creates a tiny delta negative. In that moment the tiny delta negative repels other electrons forcing a partial positive to which it attracts. These are always occurring and their strength is contingent on molecular shape and amount of electrons.

Ethan Breaux 2F
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Joined: Sat Sep 29, 2018 12:16 am

Re: London Van Der Waals Force?

Postby Ethan Breaux 2F » Tue Nov 13, 2018 2:18 am

They are caused by relative EN due to the fact that electrons move and it is also how Geckos walk on walls and stuff! (Fun fact)

Erin Nash - 4G
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Joined: Fri Sep 28, 2018 12:27 am

Re: London Van Der Waals Force?

Postby Erin Nash - 4G » Tue Nov 13, 2018 9:52 am

Van der Waals is the force that occurs because as we know, electrons are constantly moving and sometimes their movement can create an slightly more negative charge on one side of the molecule.

404982241
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Joined: Fri Sep 28, 2018 12:17 am

Re: London Van Der Waals Force?

Postby 404982241 » Sun Nov 18, 2018 10:53 pm

Yes, they are synonyms including "induced dipole induced dipole interaction." Van Der Waals forces are caused by the constant fluctuating polarizations of nearby particles causing brief attractions between molecules.


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