Dipole-Dipole vs. Dipole-Induced Dipole

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Emily Vainberg 1D
Posts: 102
Joined: Sat Jul 20, 2019 12:15 am

Dipole-Dipole vs. Dipole-Induced Dipole

Postby Emily Vainberg 1D » Sat Nov 16, 2019 1:00 pm

These two types of intermolecular forces are confusing me. How do you know if something is a permanent dipole vs. a temporary dipole that can be induced. (I know h2o is permanent but I don't understand with other molecules)

Angus Wu_4G
Posts: 102
Joined: Fri Aug 02, 2019 12:15 am

Re: Dipole-Dipole vs. Dipole-Induced Dipole

Postby Angus Wu_4G » Sat Nov 16, 2019 1:07 pm

A molecule has a permanent dipole moment if it is polar, whereas a nonpolar molecule can only have temporary dipoles (London Dispersion Forces, Van Der Waals, etc)

Alexis Webb 2B
Posts: 124
Joined: Thu Jul 11, 2019 12:15 am

Re: Dipole-Dipole vs. Dipole-Induced Dipole

Postby Alexis Webb 2B » Sat Nov 16, 2019 1:09 pm

A dipole to dipole interaction is between two polar molecules, and polar molecules always have dipole moments. By thinking about the molecules structures/shape, like we did in class, you can predict if it is polar or non polar. A dipole induced dipole interaction is usually between a polar molecule and a non polar molecule. Since the polar molecule has a dipole moment, it is forcing the non polar molecule to also have a dipole moment due to electron repulsion.

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Dipole-Dipole vs. Dipole-Induced Dipole

Postby Ethan Lam 4A » Sat Nov 16, 2019 1:10 pm

A permanent dipole for a molecule occurs when one part of the molecule is more negative than the other part. For example, in water the hydrogen is more positive than the negative oxygen. A temporary dipole can be induced when it is in the presence of another dipole molecule. When the permanent dipole molecule's partial charges interact with another molecule, it creates a dipole on it since the partial charges either attract/repel electrons to one side.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

Re: Dipole-Dipole vs. Dipole-Induced Dipole

Postby Robert Tran 1B » Sat Nov 16, 2019 2:32 pm

A permanent dipole is caused by a difference in electronegativity. An induced dipole is caused by a charged atom or dipole that pulls electrons in one side, which causes a temporary dipole.


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