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How do i know if a molecule has a dipole moment?

Posted: Wed Nov 06, 2019 11:04 am
by Julia Mazzucato 4D
Is there a certain threshold of electronegativity difference that two atoms in a molecule must have in order to make it a polar molecule with a dipole moment?
Also are we going to be given a table with electronegativities on the midterm, or will that info be provided in the question if asked, or not at all?

Re: How do i know if a molecule has a dipole moment?

Posted: Wed Nov 06, 2019 11:42 am
by Brooke Yasuda 2J
A dipole moment is a charge separation that is caused by differences in electronegativity differences. Therefore, if the two atoms that are bonded together are the same element, they have the exact same electronegativity and will be non polar. Otherwise, if there is a difference in electronegativity, the bond will be polar and this means that there are partial positive charges and partial negative charges.

Re: How do i know if a molecule has a dipole moment?

Posted: Wed Nov 06, 2019 1:02 pm
by 805097738
Brooke Yasuda 4B wrote:A dipole moment is a charge separation that is caused by differences in electronegativity differences. Therefore, if the two atoms that are bonded together are the same element, they have the exact same electronegativity and will be non polar. Otherwise, if there is a difference in electronegativity, the bond will be polar and this means that there are partial positive charges and partial negative charges.


would this mean that all bonds [between differnt elements are dipole?

Re: How do i know if a molecule has a dipole moment?

Posted: Fri Nov 08, 2019 8:54 am
by Kassidy Ford 1I
^^^ not all bonds between different elements produce a dipole because you have to take molecular shape into account. For example, in a symmetric molecule like CCl4 there would be dipoles between the C-Cl bonds, but they would all cancel each other out because of the symmetrical shape of the molecule

Re: How do i know if a molecule has a dipole moment?

Posted: Fri Nov 08, 2019 10:30 am
by Nuoya Jiang
A symmetric molecule usually does not have a dipole moment, but if it is asymmetric, check the difference in electronegativity, so you can find out its dipole moment.

Re: How do i know if a molecule has a dipole moment?

Posted: Fri Nov 08, 2019 12:24 pm
by Justin Quan 4I
To add on, you can think of dipole moments as vectors, in which the vector points at the direction towards the more electronegative atom. If all the vectors cancels out, then the molecule does not have a dipole moment.

Re: How do i know if a molecule has a dipole moment?

Posted: Fri Nov 08, 2019 12:26 pm
by Timmy Nguyen Dis 1I
If a molecule is not symmetrical, it is probably going to have a dipole moment.

Re: How do i know if a molecule has a dipole moment?

Posted: Sat Nov 09, 2019 5:39 pm
by Amy Xiao 1I
To summarize, all molecules have dipole moments unless they are between the same element and/or symmetrical?