Why do covalent compounds generally have low melting points?
Because their intermolecular forces are weak
In covalent compounds, atoms within a molecule are held together by strong covalent bonds, but separate molecules are held to each other only by weak intermolecular forces (such as van der Waals forces). Melting only needs to overcome these weak intermolecular forces, so melting points are low.
Hence, covalent compounds have low melting points because their intermolecular forces are weak.
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