Dispersion forces

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Marni Kahn 3E
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Dispersion forces

Postby Marni Kahn 3E » 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 1C
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Re: Dispersion forces

Postby Zaynab Hashm 1C » 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 1A
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Re: Dispersion forces

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

What exactly is a dispersion force?

Jordan Ziegler 1J
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Re: Dispersion forces

Postby Jordan Ziegler 1J » 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 3D
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Re: Dispersion forces

Postby Ellen Amico 3D » 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
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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.

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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)”

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