## Dipole Moment

philipraj_1F
Posts: 52
Joined: Fri Aug 30, 2019 12:16 am

### Dipole Moment

What difference in electronegativity values is needed for a dipole moment and how do you calculate this difference if we are not given an electronegativity chart?

Sophia Shaka 3L
Posts: 57
Joined: Wed Sep 18, 2019 12:20 am
Been upvoted: 1 time

### Re: Dipole Moment

You know electronegativity trends from the periodic table, so unless you want the exact numerical value, you can just follow the trend. The larger the difference in electronegativity, the larger the dipole moment. Polar molecules have permanent dipole moments, and nonpolar molecules can have induced dipole moments.

Jielena_Bragasin2G
Posts: 104
Joined: Sat Aug 24, 2019 12:18 am
Been upvoted: 1 time

### Re: Dipole Moment

You can find the polarity of a molecule using the lewis structures and VSEPR models.

Natalie Benitez 1E
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### Re: Dipole Moment

How do we tell there is a major difference in electronegativity to cause dipole-moments? Is there a specific range or even an electronegativity chart being given?

Katherine Brenner 3H
Posts: 73
Joined: Wed Sep 18, 2019 12:18 am

### Re: Dipole Moment

Can an individual molecule be dipole- dipole. Or would we just say that this is a dipole moment within 1 molecule?

Sion Hwang 4D
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

### Re: Dipole Moment

Katherine Brenner 3H wrote:Can an individual molecule be dipole- dipole. Or would we just say that this is a dipole moment within 1 molecule?

An individual molecule will only have a dipole moment. Dipole-dipole interaction can only occur between two molecules. This is because dipole-dipole is an intermolecular force, not an intermolecular force.

Daniel Yu 1E
Posts: 100
Joined: Sat Aug 24, 2019 12:15 am

### Re: Dipole Moment

Dipole-Dipole is a describing two molecules, each with an individual dipole, interacting. Thus it is an intermolecular force. A dipole itself is a separation of charge in a molecule, resulting from an uneven distribution of electrons.

AprilPaz
Posts: 51
Joined: Wed Sep 18, 2019 12:18 am

### Re: Dipole Moment

The difference in electronegativities dictates the size of the dipole moment.

Posts: 52
Joined: Thu Jul 11, 2019 12:16 am

### Re: Dipole Moment

The periodic table provides a general trend of electronegativity, and you can determine whether a molecule has a dipole moment and is polar from the shape using the VSEPR model.

Katherine Brenner 3H
Posts: 73
Joined: Wed Sep 18, 2019 12:18 am

### Re: Dipole Moment

Does Dipole Moments indicate polarity also?

Emily_4B
Posts: 57
Joined: Wed Sep 18, 2019 12:21 am

### Re: Dipole Moment

Katherine Brenner 3H wrote:Does Dipole Moments indicate polarity also?

Yes if dipole moments do not cancel out then the molecule is polar