Intermolecular interactions 3F.1 (7th edition)

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Hailey Boehm 2H
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Joined: Fri Sep 28, 2018 12:24 am

Intermolecular interactions 3F.1 (7th edition)

Postby Hailey Boehm 2H » Thu Nov 22, 2018 7:28 pm

3F.1 asks you to "identify the types of attractive intermolecular interactions that might arise between molecules of the following substances: (a)NH2OH; (b)CBr4; (c)H2SeO4; (d)SO2"
I understand how to determine if hydrogen bonding may arise, but how can you determine whether London forces or dipole-dipole interactions will be present? Do you analyze electronegativity, polarizability, or both?

timschaeffer Dis 1J
Posts: 38
Joined: Fri Sep 28, 2018 12:18 am

Re: Intermolecular interactions 3F.1 (7th edition)

Postby timschaeffer Dis 1J » Thu Nov 22, 2018 7:38 pm

As a rule of thumb:

1) london dispersion forces will exist between any two non-polar molecules

2) dipole-induced dipole forces will exist to some extent between any polar molecule and any non-polar molecule

3) dipole-dipole interactions will exist between any two polar molecules.

Essentially you need to figure out which molecules are polar and non-polar. I recommend that you draw the lewis structures and analyze the electronegativity of the atoms involved. If the atoms have different electronegativities and are arranged asymmetrically, then the molecule as a whole is polar.

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