Question

How do you determine the polarity of a molecule especially when there are lone pairs present? I know for a bond polarity, I can look at the difference between the electronegativities but what about the molecule itself?

Answer 1

To determine the polarity of a molecule , we check ý the value or not, has dipole moment molecule a net The on overall value of the the dipole moment dipole moment un in a molecule dependa. its geometry and shape. ie. vectorial addition of dipole moment of the constituent abowe bonds. * A symmetrical molecule is Non-Polar even though it contains polar bonds. For example 0₂, BF3 , Chly being symmetrical molecules have zero resultant dipple moment. Dipole moment is indicated by t Ht B Htc TH XA unsymmetrical non-linear polyatomic molecules always have a net value of dipole moment, This such molecules are Polar Ha SH 0 to H x Ex: tho, so₂ , NH₃ ( Nole - dipole moment In above 3 molecules , red arrow 1 red arrow is is the resultant the