Dispersion forces

Moderators: Chem_Mod, Chem_Admin

Marni Kahn 1A
Posts: 107
Joined: Thu Jul 25, 2019 12:17 am
Been upvoted: 1 time

Dispersion forces

Postby Marni Kahn 1A » Thu Nov 07, 2019 11:18 am

Why does the strength of a dispersion force depend on the polarizability of the atoms in a molecule?

Zaynab Hashm 2I
Posts: 110
Joined: Wed Sep 11, 2019 12:15 am
Been upvoted: 1 time

Re: Dispersion forces

Postby Zaynab Hashm 2I » Thu Nov 07, 2019 2:23 pm

polarizability is the measure of how easily the electron cloud is distorted, so the higher the polarizability, the stronger the dispersion force because the larger electron clouds allow for more effective overlap resulting in a higher attraction between the molecules.

Alison Trinh 1E
Posts: 104
Joined: Thu Jul 25, 2019 12:16 am

Re: Dispersion forces

Postby Alison Trinh 1E » Fri Nov 08, 2019 2:31 pm

What exactly is a dispersion force?

Jordan Ziegler 2J
Posts: 59
Joined: Sat Aug 17, 2019 12:15 am

Re: Dispersion forces

Postby Jordan Ziegler 2J » Fri Nov 08, 2019 3:08 pm

A dispersion force is synonymous with induced dipole-induced dipole forces.

To go into a deeper definition, the electrons holding together a polar molecule will shift around and create dipoles for split seconds at a time. When two nonpolar molecules interact during this shift, they will be held together by a dispersion force (or an induced dipole-induced dipole force)

Ellen Amico 2L
Posts: 101
Joined: Thu Sep 19, 2019 12:16 am

Re: Dispersion forces

Postby Ellen Amico 2L » Fri Nov 08, 2019 3:36 pm

The dispersion depends on the polarizability because the the more polarizable an atom is, the more it'll affect the electron density and the more the electrons will be attracted to each other. Therefore, there will be a larger fluctuation in the dipoles and the potential energy of the interaction will increase.

Simon Dionson 4I
Posts: 107
Joined: Sat Sep 14, 2019 12:17 am

Re: Dispersion forces

Postby Simon Dionson 4I » Fri Nov 08, 2019 6:13 pm

Polarizability is how likely an electron cloud can be distorted in shape. Polarizability also increases with the size of atoms and how many electrons they have. If an atom has more electrons, there is a higher likelihood electrons can gather on one side and create an induced dipole.

nickianel_4b
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Dispersion forces

Postby nickianel_4b » Fri Nov 08, 2019 6:51 pm

Alison Trinh 1A wrote:What exactly is a dispersion force?


A dispersion force is the same as a van der Waals force or induced dipole-induced dipole force. It's an intermolecular force that occurs when electron distribution causes two molecules to form temporary dipoles and become attracted.


Return to “Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)”

Who is online

Users browsing this forum: No registered users and 4 guests