Learning Goals identify symmetry in a molecule determine overall polarity of a molecule Determining Molecular Polarity Overall Polarity of a Molecule depends on dipole ID: 495372
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Slide1
2.3 Comparing the Properties of Ionic and Molecular Compounds
Learning Goals …
…
identify symmetry
in a molecule
… determine overall polarity of a molecule Slide2
Determining Molecular Polarity
Overall Polarity of a Molecule depends
on:
dipole
moments (location of partial charges)
molecular
shape
In order for a molecule to be POLAR it must have…
Polar covalent bonds (dipole moments)
Non symmetrical partial charge distributionSlide3
Nonpolar
M
olecules
a) No dipole moments
CH
4
Δ
EN = 0.4
b) Dipole moments are symmetrical and cancel out.
BCl
3
Δ
EN = 1.12Slide4
Polar Molecules
Dipole moments are asymmetrical and don’t cancel .
net
dipole
moment
H
2
O
H
H
O
CHCl
3
H
Cl
Cl
Cl
net
dipole
momentSlide5
..
..
..
Polar Bonds
H
Cl
Polar
H
H
O
Polar
F
F
B
F
Nonpolar
H
H
H
N
Polar
Cl
Cl
C
Cl
Nonpolar
Polar
Cl
H
C
Cl
H
HSlide6
Can I …
… identify symmetry in a molecule
… determine overall polarity of a molecule
HOMEWORK
WS
“Molecular Shapes and Polarity
”
p82 #9