Test 2: IMF

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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Jasmine 2C
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Joined: Wed Sep 18, 2019 12:18 am

Test 2: IMF

Postby Jasmine 2C » Wed Nov 20, 2019 5:28 pm

Do we need to know about ion-dipole forces and dipole-dipole forces for the test? They are sections 3F2 and 3F3 but in outline 3, it only specified 3F4 and 5. But Dr Lavelle went over ion-dipole and dipole-dipole forces in class so I'm not sure.

Brian_Ho_2B
Posts: 131
Joined: Fri Aug 09, 2019 12:16 am

Re: Test 2: IMF

Postby Brian_Ho_2B » Wed Nov 20, 2019 5:32 pm

It is a great idea to review those specific intermolecular forces. The test will definitely cover IMF, and it is necessary to know the hierarchy of the strengths of the IMFs. The hierarchy is LDF < Dipole-induced dipole < dipole-dipole < h-bonding or ion-dipole (ask TA's or Prof. Lavelle for clarification; these two are very similar in strength but ultimately, it depends) < ion-ion.

KnarGeghamyan1B
Posts: 60
Joined: Fri Aug 09, 2019 12:15 am

Re: Test 2: IMF

Postby KnarGeghamyan1B » Wed Nov 20, 2019 5:44 pm

Just to give a general ballpark for the values, here's the list he gave us in lecture,
Ion-Ion = -250kJ/mol
Ion-dipole = -15kJ/mol
Dipole-dipole = -2kJ/mol
Dipole-induced dipole = -kJ/mol

Janet Nguy 3I
Posts: 62
Joined: Sat Aug 24, 2019 12:17 am

Re: Test 2: IMF

Postby Janet Nguy 3I » Thu Nov 21, 2019 6:17 pm

You might also need to know how IMF relate to relative boiling points of molecules.

Celena Kim 2I
Posts: 61
Joined: Sat Sep 14, 2019 12:17 am

Re: Test 2: IMF

Postby Celena Kim 2I » Fri Nov 22, 2019 2:26 pm

Just know the basic intermolecular forces and their relationship with melting/boiling points.


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