polarizability

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Christineg1G
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polarizability

Postby Christineg1G » Tue Nov 19, 2019 7:00 pm

What is the role of polarizability when determining higher and lower melting/boiling points of compounds?

Paige Lee 1A
Posts: 106
Joined: Sat Sep 07, 2019 12:16 am

Re: polarizability

Postby Paige Lee 1A » Tue Nov 19, 2019 7:02 pm

The higher polarizability of a molecule, the stronger intermolecular forces/attractions there will be, so it will be harder to break bonds. Which means its melting point and boiling point will be high.

BeylemZ-1B
Posts: 64
Joined: Thu Jul 25, 2019 12:17 am

Re: polarizability

Postby BeylemZ-1B » Wed Nov 20, 2019 3:33 pm

to add on, typically, the larger the molecule, the larger the polarizability. this is because the electrons are farther away from the nucleus and the valence electrons are more shielded from the pulling power of the nucleus.

Kavee Dodampahala 4E
Posts: 51
Joined: Sat Jul 20, 2019 12:17 am

Re: polarizability

Postby Kavee Dodampahala 4E » Wed Nov 20, 2019 3:55 pm

Larger molecules also have more electrons in general which makes them more polarizable.

sarahsalama2E
Posts: 143
Joined: Fri Aug 30, 2019 12:16 am

Re: polarizability

Postby sarahsalama2E » Wed Nov 20, 2019 4:56 pm

does the bigger the atom mean the stronger the ldf and dipole-dipole forces?

VPatankar_2L
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Re: polarizability

Postby VPatankar_2L » Fri Nov 22, 2019 3:18 pm

Larger molecules will have stronger London Dispersion Forces, which means that their boiling point will be high.

Rebekah Alfred 1J
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Re: polarizability

Postby Rebekah Alfred 1J » Fri Nov 22, 2019 3:27 pm

When the intermolecular forces are stronger, it requires more energy to break the bonds, thus making the melting/boiling point higher. For example, CHI3 will have a higher melting point than CHF3 because Iodine has a higher polarizability than Fluorine, which makes the intermolecular forces stronger and melting point higher for CHI3.

Kylie Lim 4G
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Joined: Sat Aug 17, 2019 12:15 am

Re: polarizability

Postby Kylie Lim 4G » Fri Nov 22, 2019 3:49 pm

Larger molecules have more polarizable electrons which means they will be more distorted. This makes dispersion stronger and the melting/boiling point of the compound higher

CynthiaLy4F
Posts: 80
Joined: Sat Jul 20, 2019 12:16 am

Re: polarizability

Postby CynthiaLy4F » Fri Nov 22, 2019 7:18 pm

The higher the polarizability, the higher the boiling/melting points due to stronger intermolecular forces.

005321227
Posts: 87
Joined: Sat Sep 07, 2019 12:15 am

Re: polarizability

Postby 005321227 » Fri Nov 22, 2019 7:23 pm

A higher polarizability indicates a higher melting point since it has higher intermolecular forces


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