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III. Molecular Polarity (p. 183)

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Ch. 6 – Molecular Structure. III. Molecular Polarity (p. 183).  +.  -. H Cl. A. Dipole Moment. Direction of the polar bond in a molecule. Arrow points toward the more e - neg atom. B. Determining Molecular Polarity. Depends on : dipole moments molecular shape. F. BF 3. B. F. F.

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Presentation Transcript
a dipole moment

+

-

H Cl

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

C. Johannesson

b determining molecular polarity
B. Determining Molecular Polarity
  • Depends on:
    • dipole moments
    • molecular shape

C. Johannesson

b determining molecular polarity4

F

BF3

B

F

F

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

C. Johannesson

b determining molecular polarity5

O

net

dipole

moment

H2O

H

H

B. Determining Molecular Polarity
  • Polar Molecules
    • Dipole moments are asymmetrical and don’t cancel .

C. Johannesson

b determining molecular polarity6

H

net

dipole

moment

CHCl3

Cl

Cl

Cl

B. Determining Molecular Polarity
  • Therefore, polar molecules have...
    • asymmetrical shape (lone pairs) or
    • asymmetrical atoms

C. Johannesson

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