III. Molecular Polarity

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III. Molecular Polarity Molecular Structure III. Molecular Polarity

+ - A. Dipole Moment H Cl Direction of the polar bond in a molecule. Arrow points toward the more e-neg atom. H Cl + -

B. Determining Molecular Polarity Depends on: dipole moments molecular shape

B. Determining Molecular Polarity Nonpolar Molecules Dipole moments are symmetrical and cancel out. BF3 F B

B. Determining Molecular Polarity Polar Molecules Dipole moments are asymmetrical and don’t cancel . H2O H O net dipole moment

B. Determining Molecular Polarity Therefore, polar molecules have... asymmetrical shape (lone pairs) or asymmetrical atoms CHCl3 H Cl net dipole moment