Molecular Shape & Molecular Polarity

In molecules with more than two atoms, both shape and bond polarity determine molecular polarity.

The dipole moment (µ) is the product of these partial charges and the distance

between them.

It is typically measured in debye (D) units; using the SI units of charge (coulomb, C) and length (meter, m),

1 D = 3,34X 10-30 Cm

The Pauling electronegativity (EN) scale.

Arrange each set of bonds in order of increasing polarity, and indicate bond polarity with δ + and δ - symbols:

(a)Cl-F, Br-CI, CI-CI

(b) Si-Cl, P-CI, S - CI, Si-Si

Polar Covalent Bonds

CO2

H2O

CCl4

CHCl3

Prediksi apakah molekul di bawah ini adalah molekul polar atau non polar:

•Ammonia, NH3 •Boron trifluoride, BF3•Carbonyl sulfide, COS (atom sequence

SCO)

Answer

BF3

COS

TASK

Show the bond dipoles and molecular dipole, if any, for :

•dichloromethane (CH2CI2)• iodine oxide pentafluoride (IOF5)•nitrogen tribromide (NBr3)

CH2CI2

IOF5

NBr3

The answer

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