Effect of size  [ENDORSED]

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David Zhang 1B
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Joined: Mon Jun 17, 2019 7:23 am

Effect of size

Postby David Zhang 1B » Mon Jul 15, 2019 8:30 pm

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

Jeril Joseph 1B
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Re: Effect of size  [ENDORSED]

Postby Jeril Joseph 1B » Mon Jul 15, 2019 11:01 pm

I believe this is due to the fact that with increasing molar mass and atomic size comes with an increase in electrons. With the increase in electrons, the atom has a higher interaction potential energy. Also, polarizability , which is the measure of the ability for anions to form dipoles or to be distorted in their electron clouds, needs to be considered since polarizability is proportional to interaction energy. Because larger atoms tend to have higher polarizability, those atoms will also have higher interaction energies. Hope this helps.

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Re: Effect of size

Postby nicknavejas1B » Sun Jul 21, 2019 8:53 pm

This was very imformative thank you

Yilun Ding
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Joined: Tue Jun 25, 2019 12:15 am

Re: Effect of size

Postby Yilun Ding » Tue Jul 23, 2019 7:47 pm

This is because that increase the molecular mass will increase the number of electrons present in a molecule, its electron clouds will be more likely to be distorted(polariziability) which will lead to greater attraction.

Yasmin Olvera 1D
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Re: Effect of size

Postby Yasmin Olvera 1D » Tue Jul 30, 2019 2:27 pm

I think because Van der Waals forces depend on size. he bigger the size, the greater the force due to the electron clouds.

Jennifer Zhou 1A
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Re: Effect of size

Postby Jennifer Zhou 1A » Tue Jul 30, 2019 2:46 pm

I think the London forces gets higher when there are more electrons, since there is a bigger electron cloud to be induced

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Re: Effect of size

Postby jlinwashington1B » Tue Jul 30, 2019 5:04 pm

so does this have anything to do with electronegativity?

Bella Martin
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Re: Effect of size

Postby Bella Martin » Tue Jul 30, 2019 10:06 pm

From my understanding, the larger the atom, the less electronegative it is because the electrons are farther away from the attractive force of the positive nucleus. Therefor, the nucleus isn't able to pull new electrons in with as much force as, say, Fluorine.

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