Confused About Van der Waals' & Ionic Solids

AI Thread Summary
Graphite is identified as a Van der Waals' solid, while salt is classified as an ionic solid. The discussion highlights that Coulomb interactions primarily influence the electron behavior in graphite, with van der Waals forces holding the layers together. The second part of the homework requires understanding the variation of potential energy with distance between particles, specifically using the Lennard-Jones potential for van der Waals forces and the Coulomb potential for ionic forces. This results in a value of β equal to 6 for van der Waals and 1 for ionic interactions. Understanding these concepts is crucial for solving the homework problem effectively.
geoffreythelm
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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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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.
 
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 \beta as 6 for the former and 1 for the latter.
 
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