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9.6.16 Chemistry 1212KNotes[Week 3] Chapter 10 Lecture Cont. MolecularPolarity Question:Why are some molecules polar in natures andother are nonpolar Answer:Lookattheir intramolecular bondingandtheir three-dimensional structures (geometries).  Inorder for molecules to be polar,the followingcriteriamustbe met: o There must be polar covalent bonds withinthe molecule. o The molecule must have anetdipole moment, because the molecule’s geometry is not symmetric.  The netdipole moment is due to a difference inbondatoms’ electronegativities. Exceptions:1lone pair=asymmetrical,2 lone pairs=symmetrical,3  Dipole Moment—the directionwherethe electrons are beingpulled to.Polar molecule