Properties of Small Molecules

• Substances that consist of small molecules are usually gases or liquids that have relatively low melting points and boiling points
• These substances have only weak forces between the molecules (intermolecular forces). It is these forces that are overcome, not the covalent bond when the substance melts or boils.
• The intermolecular forces increase with the size of the molecules
• These substances do not conduct electricity because the molecules do not have an overall electric charge