Ordering Intermolecular Forces Clarification

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Hannah Lee 2F
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Joined: Thu Jul 11, 2019 12:15 am

Ordering Intermolecular Forces Clarification

Postby Hannah Lee 2F » Wed Nov 20, 2019 11:39 pm

In the notes, it says that dipole-dipole, dipole-induced dipole, and induced dipole-induced dipole all typically have around -2 kJ/mol of E. However, I thought that the order of IMF strength went from dipole-dipole > dipole-induced dipole > induced dipole-induced dipole? Can someone clarify this for me?

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

Re: Ordering Intermolecular Forces Clarification

Postby Sarah Blake-2I » Wed Nov 20, 2019 11:42 pm

You are correct in the order of the forces. I think the numbers he gave us in class were not related to strength of the forces but rather the energy of the forces. Since we do not need to know those values, I would just put those to the side and go off of the fact that dipole-dipole is greater than dipole-induced dipole which is greater than London forces.

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Joined: Wed Sep 18, 2019 12:19 am

Re: Ordering Intermolecular Forces Clarification

Postby AlyshaP_2B » Thu Nov 21, 2019 1:10 am

Dipole dipole is the strongest, followed by dipole induced dipole. London dispersion forces are the weakest, but if you have a lot of them they can add up and be strong.

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