Ionic compounds have the following physical properties:

  • They are solid with high melting points.
  • They are soluble in polar solvents (water). However, they have low solubility in nonpolar solvents.
  • Molten and in aqueous solution they conduct electric current.
  • They are obtained from elements with different electronegativity (metal and non-metal)

Covalent compounds have the following properties:

  • Many covalent compounds are gases and liquids. Solids have relatively low melting points.
  • They present an important solubility in apolar solvents (toluene, hexane, carbon tetrachloride). Presenting low solubility in polar solvents.
  • They do not present electrical conductivity in liquid phase.
  • They are made up of elements with similar electronegativities.