Covalent bonds are usually distinguished from
ionic bonds. The big difference between them is
that while covalently bonded substances can
dissolve in polar solvents (such as water), they
retain their molecular form once dissolved.
Ionic bonds by contrast break when the
substance dissolves. You can tell whether a
substance dissolving is covalently bonded or
ionically bonded because the ions are
electrically charged: water containing dissolved
ions conducts electricity, and water containing
only dissolved covalently-bonded material does
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