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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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Ch 6 molecular structure

Ch. 6 – Molecular Structure

III. Molecular Polarity(p. 183)

C. Johannesson


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 polarity1

F

BF3

B

F

F

B. Determining Molecular Polarity

  • Nonpolar Molecules

    • Dipole moments are symmetrical and cancel out.

C. Johannesson


B determining molecular polarity2

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 polarity3

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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