V. Molecular Polarity (p. 183) Ch. 6 – Molecular Structure V. Molecular Polarity (p. 183)
+ - 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