Answer:
Properties of Covalent Molecular Compounds.
•Low melting points and boiling points. A relatively small amount of energy is required to overcome the weak attractions between covalent molecules, so these compounds melt and boil at much lower temperatures than metallic and ionic compounds do. In fact, many compounds in this class are liquids or gases at room temperature.
•Low enthalpies of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds.
•Soft or brittle solid forms. The weak intermolecular forces makes the solid form of covalent molecular compounds easy to distort or break.
•Poor electrical and thermal conductivity. Ionic compounds conduct electricty well when melted; metallic solids do as well. Covalent molecular compounds do not.
