Register to reply

Van der Waals'

by geoffreythelm
Tags: waals
Share this thread:
Aug13-09, 02:57 PM
P: 11
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

I think Graphite is a Van der Waals' Solid and, er, salt would be an ionic.
But I really don't have much of a clue about what the second part is going on about!

Thanks! :)
Attached Thumbnails
Phys.Org News Partner Science news on
Scientists discover RNA modifications in some unexpected places
Scientists discover tropical tree microbiome in Panama
'Squid skin' metamaterials project yields vivid color display
Aug13-09, 04:32 PM
P: 37
Can't see the attachment yet. While Coulomb interaction dominate the interplay between electrons in graphite, I do believe the force holding the layers together could be referred to as van der Waals.
Aug14-09, 09:38 AM
P: 624
The second part is asking you for the variation of potential (attractive term) with respect to the distance between the particles, so for the van der Waals' forces, the Lennard-Jones potential applies, while for the ionic forces, the Coulomb potential applies. This would give [tex]\beta[/tex] as 6 for the former and 1 for the latter.

Register to reply

Related Discussions
DFT vs Van de Waals Atomic, Solid State, Comp. Physics 3
Van Der Waals forces Biology, Chemistry & Other Homework 3
Van der waals gas Advanced Physics Homework 0
Van der waals gas General Physics 1
Van der waals Advanced Physics Homework 0