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These substances are considered to be physically mixed and are held together by weak intermolecular forces. Examples include mixtures of sand and sugar, where the components can be physically separated by methods such as filtration or sieving.
Covalent solids generally have lower melting points than ionic solids. This is because covalent solids are made up of discrete molecules held together by relatively weak intermolecular forces, whereas ionic solids are made up of ions held together by strong electrostatic forces. The weaker intermolecular forces in covalent solids require less energy to overcome, resulting in a lower melting point.
The force of attraction between molecules can vary in strength, depending on the types of molecules involved. Generally, these intermolecular forces are weaker than the forces holding atoms together in a molecule. Examples of weak intermolecular forces include van der Waals forces and hydrogen bonding.
The intermolecular forces in gases are very weak.
Intermolecular forces are weak in gases.