Size and Strength of Attractive forces

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MaiaRodriguezChoi3E
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

Size and Strength of Attractive forces

Postby MaiaRodriguezChoi3E » Tue Nov 27, 2018 1:09 pm

Why does the increasing size or molar mass of a molecule result in stronger attractive interactions?

Kate Chow 4H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: Size and Strength of Attractive forces

Postby Kate Chow 4H » Tue Nov 27, 2018 1:26 pm

Increasing molar mass means that the molecule has more electrons. When there are more electrons present, there are stronger London Dispersion Forces, and thus stronger attraction. Also, in larger/heavier molecules, the valence electrons are further away from the nucleus, which allows for easier temporary dipole interactions.

Mayaal_Khan_4H
Posts: 41
Joined: Fri Sep 28, 2018 12:28 am

Re: Size and Strength of Attractive forces

Postby Mayaal_Khan_4H » Tue Nov 27, 2018 1:41 pm

As you increase the molar mass of a molecule, you are increasing the number of electrons in that molecule which then increases the molecule's attraction to other molecules, thus resulting in stronger London Dispersion Forces.


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