| 21. | For physisorption, adsorbate is attracted to the surface atoms by van der Waals forces.
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| 22. | The van der Waals force of adhesion is also dependent on the surface topography.
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| 23. | Van der Waals forces originate from the interactions between induced, permanent or transient electric dipoles.
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| 24. | The van der Waals force between a pair of neutral atoms is a similar effect.
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| 25. | They are part of the van der Waals forces.
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| 26. | Organic materials form molecular crystals where the molecules are loosely bound by Van der Waals forces.
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| 27. | The interaction itself involves electrostatic and van der Waals forces and can also include hydrogen bonds.
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| 28. | They layers are bound only by Van der Waals forces, therefore there is very little strain.
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| 29. | Binding occurs by intermolecular forces, such as ionic bonds, hydrogen bonds and Van der Waals forces.
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| 30. | The van der Waals forces are named after the scientist who first described them in 1873.
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