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: The [[Physical Property|physical properties]] of [[substance]]s made of '''simple covalent molecules''' are determined by the the [[Covalent Bond|covalent bonds]] within [[molecule]]s and the [[Intermolecular Bond|intermolecular bonds]] between [[molecule]]s.
: The [[Boiling Point|boiling point]] and [[Melting Point|melting point]] of a ''simple covalent''' [[substance]] are determined by the strength of [[Intermolecular Bond|intermolecular bond]]s. The stronger the [[Intermolecular Bond|intermolecular bond]]s the higher the [[Boiling Point|boiling point]] and [[Melting Point|melting point]].
: [[Substance]]s made of '''simple covalent molecules''' are usually poor [[Electrical Conductor|electrical conductors]] because [[Electrical Charge|charge]]d [[particle]]s such as [[electron]]s or [[ion]]s are not free to move from one place to another.
: [[Substance]]s made of '''simple covalent molecules''' are usually poor [[Thermal Conductor|thermal conductors]] because [[electron]]s are not free to move around the [[material]].