Boiling Point and bonds

Moderators: Chem_Mod, Chem_Admin

Angeline 3E
Posts: 50
Joined: Wed Sep 18, 2019 12:20 am

Boiling Point and bonds

Postby Angeline 3E » Mon Dec 02, 2019 4:49 pm

How can we use boiling points to argue why one compound has a higher IMF than another without incorporating in bonds since BPs don't break bonds?

Brian_Ho_2B
Posts: 182
Joined: Fri Aug 09, 2019 12:16 am

Re: Boiling Point and bonds

Postby Brian_Ho_2B » Mon Dec 02, 2019 4:53 pm

Boiling points and other phase changes where entropy increases is due to the intermolecular forces weakening so that the attraction between each molecule is weaker and thus there is more space between each molecule. Boiling doesn't break intramolecular bonds, but it does break intermolecular attractions between molecules.

AnayaArnold_3L
Posts: 56
Joined: Wed Sep 18, 2019 12:19 am

Re: Boiling Point and bonds

Postby AnayaArnold_3L » Tue Dec 03, 2019 11:00 am

How can we guess which compound has a higher boiling point if we are only given the name?

Subashni Rajiv 1K
Posts: 81
Joined: Wed Sep 18, 2019 12:16 am

Re: Boiling Point and bonds

Postby Subashni Rajiv 1K » Tue Dec 03, 2019 11:13 am

Drawing the lewis structure of the molecule can help you figure out the intramolecular forces. From there, the stronger the forces/bonds, the higher the boiling point.

Bita Ghanei 1F
Posts: 60
Joined: Thu Feb 28, 2019 12:15 am

Re: Boiling Point and bonds

Postby Bita Ghanei 1F » Tue Dec 03, 2019 11:18 am

For LDFs, the higher molecular weight results in a higher boiling point (ie HI has a higher boiling point than HCl)
For dipole-dipole interactions, the greater difference in electronegativity has a higher boiling point

Janet Nguy 2C
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Boiling Point and bonds

Postby Janet Nguy 2C » Tue Dec 03, 2019 11:58 am

Bita Ghanei 1F wrote:For LDFs, the higher molecular weight results in a higher boiling point (ie HI has a higher boiling point than HCl)
For dipole-dipole interactions, the greater difference in electronegativity has a higher boiling point


Why does a higher molecular weight result in a higher boiling point? And why does a higher electronegativity difference result in a higher boiling point?


Return to “Bond Lengths & Energies”

Who is online

Users browsing this forum: No registered users and 2 guests