Van der Waals'

  • #1

Homework Statement




Homework Equations





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! :)
 

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Answers and Replies

  • #2
37
0
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.
 
  • #3
954
117
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.
 

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