Intermolecular bonding homework

[phee]

Homework Statement

All molecular compounds may have London, Dipole-Dipole, and hydrogen bonding intermolecular forces, affecting their physical and chemical properties. Indicate which intermolecular forces contribute to the attraction between molecules in each of the following classes of organic compounds.

a) CH3OCH
b)C6H5COOC2H5
c) CaCO3

Homework Equations

N/A

The Attempt at a Solution

I know how to do it for simple molecular formulas, but now I have molecular formulas with more than 2 different elements. How would I go about doing this? Would I need to draw out the lewis structure and do the electronegativies between the molecules that are connected? Any help would be appreciated, I do not want answers, just a kick in the right direction.

 

[zhermes]

I think you're on the right track; it might help to think about it more generally---what characteristics determine which intermolecule forces are important? Which of those characteristics do each of those compounds possess?

 

[phee]

I think you're on the right track; it might help to think about it more generally---what characteristics determine which intermolecule forces are important? Which of those characteristics do each of those compounds possess?

So for example all of those would have Hydrogen bonding because the H is chemically bonded to O in all three examples?

All would have weak london forces, I believe, what constitutes dipole-dipole?

 

[zhermes]

...

what characteristics determine which intermolecule forces are important?

 

[phee]

...

London forces = hold covalent molecules together
Dipole-dipole = Hold polar covalent molecules together
hydrogen bonding = formed between electropositive Hydrogen dipole and an electronegative dipole of O, CL, Fl, N

 

[phee]

bump, still stuck on this question, any help appreciated