Determining possible intermolecular forces

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Leslie Cheng 4B
Posts: 35
Joined: Fri Sep 28, 2018 12:29 am

Determining possible intermolecular forces

Postby Leslie Cheng 4B » Wed Dec 05, 2018 9:41 am

Is there an easy way to remember which type of intermolecular forces are possible by looking at a molecule? What are the key characteristics of each type of intermolecular force? (For example, dispersion forces are present in all molecules?)

Megan Wong 4E
Posts: 32
Joined: Fri Sep 28, 2018 12:28 am

Re: Determining possible intermolecular forces

Postby Megan Wong 4E » Wed Dec 05, 2018 9:54 am

Aside from VDW, as you mentioned, that can be found in all molecules, another one is that hydrogen bonding can occur between hydrogens attached to either F, O, or N.

Joaquin Andrade
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

Re: Determining possible intermolecular forces

Postby Joaquin Andrade » Wed Dec 05, 2018 11:32 am

Dipole moments can also be found in polar molecules, depending on the electronegativity difference and the shape of the molecule. For instance, a tetrahedral allows for a dipole moment to occur whereas in an octahedral the non-central atoms pull away from each and cancel each other out.

Sydney Stump
Posts: 30
Joined: Fri Sep 28, 2018 12:17 am

Re: Determining possible intermolecular forces

Postby Sydney Stump » Wed Dec 05, 2018 11:48 am

The most important factor in determining the intermolecular forces on a molecule is the polarity of the molecule. A polar molecule will be involved in forces such as dipole-dipole. A nonpolar molecule cannot be involved in dipole-dipole forces because there is no charge, therefore there is no dipole.


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