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Permanent and Temporary Dipoles Dipoles: * A molecule with a positive end and a negative end * When a molecule has a dipole it is called polarised * There are several ways a molecule can become polarised Permanent Dipoles: * Permanent dipoles occur when a molecule has two atoms bonded together which have substantially different electro negatively, so that one atom attracts the shared electrons much more than the other * Hydrogen chloride has a permanent dipole, because chlorine is much more electronegative than hydrogen, and so attracts the shared electrons more * Molecules with a permanent dipole are called polar molecules Instantaneous Dipoles: * Some molecules do not possess a permanent dipole, because the atoms that are bonded together have the same, or very similar, electro negatively, so that the electrons are evenly shared * Even though the molecule doesn't have a permanent dipole, a temporary, or instantaneous dipole can arise * Left on its own, this dipole only lasts for...

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