Question

covalent compounds have low melting and boiling point. why?​

Answer 1

Answer:

When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relatively little energy is needed to overcome the intermolecular forces, so simple molecular substances have low melting and boiling points.

Answer 2

Answer:

There are intermolecular forces between simple molecules. Intermolecular forces are much weaker than the strong covalent bonds in molecules. When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relatively little energy is needed to overcome the intermolecular forces, so simple molecular substances have low melting and boiling points.

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