Van der Waals forces must be broken to melt this type of solid.

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Van der Waals forces are relatively weak interactions between molecules and are typically found in molecular solids. These forces must be broken in order to allow the individual molecules to move past each other and melt the solid. Covalent network solids, metallic solids, and ionic solids have stronger types of bonding that require more energy to break apart, and typically have higher melting points than molecular solids.

Van Der Waals Forces Must Be Broken to Melt This