Boiling and Melting Points

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Haley Pham 4I
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

Boiling and Melting Points

Postby Haley Pham 4I » Sun Nov 10, 2019 10:59 pm

How do polarizability and the different intermolecular forces affect the boiling and melting points of compounds?

Jonathan Gong 2H
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: Boiling and Melting Points

Postby Jonathan Gong 2H » Sun Nov 10, 2019 11:04 pm

The stronger the intermolecular forces the higher the boiling point/melting point will be. Generally, polar molecules have dipole-dipole forces, making them have stronger intermolecular forces than nonpolar molecules, thus, they will boil/melt at a higher temperature.

KnarGeghamyan1B
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Re: Boiling and Melting Points

Postby KnarGeghamyan1B » Sun Nov 10, 2019 11:20 pm

The boiling point of H2S is -60 degrees C while the boiling point of H2O is 100 degrees C. These molecules are very similar in structure, but H2O is harder to break down because the bonds are stronger.

rohun2H
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

Re: Boiling and Melting Points

Postby rohun2H » Mon Nov 11, 2019 1:42 am

As intermolecular forces increase, the structure becomes more stable and therefore the melting/boiling points will also increase.

Maya Pakulski 1D
Posts: 105
Joined: Thu Jul 11, 2019 12:17 am

Re: Boiling and Melting Points

Postby Maya Pakulski 1D » Mon Nov 11, 2019 12:58 pm

Jonathan Gong 1A wrote:The stronger the intermolecular forces the higher the boiling point/melting point will be. Generally, polar molecules have dipole-dipole forces, making them have stronger intermolecular forces than nonpolar molecules, thus, they will boil/melt at a higher temperature.


How do we find these intermolecular forces?

Lauren Tanaka 1A
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Joined: Sat Aug 17, 2019 12:18 am

Re: Boiling and Melting Points

Postby Lauren Tanaka 1A » Tue Nov 12, 2019 7:28 pm

A stronger intermolecular force will have a greater boiling or melting point. This is because since the bonds are stronger, they are harder to break apart. Increasing the polarizability of a molecule will create a stronger interaction leading to a higher boiling and melting point.

Shrayes Raman
Posts: 129
Joined: Sat Jul 20, 2019 12:15 am

Re: Boiling and Melting Points

Postby Shrayes Raman » Wed Nov 13, 2019 12:11 am

Stronger bonds/interactions higher melting point

lauraxie2e
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

Re: Boiling and Melting Points

Postby lauraxie2e » Wed Nov 13, 2019 9:24 am

As the forces get stronger the BP and MPs get higher.


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