UNIT IX
Lesson #2
Polar Vs Non Polar
Review
BOND TYPE
WHAT TO LOOK FOR...
INTRAMOLECULAR BONDS ( within the molecule itself)
IONIC BOND
Made up of metal and nonmetal (or
recognizable ions)
COVALENT BOND
Made up of nonmetal and nonmetal
INTERMOLECULAR BONDS ( between molecules)
HYDROGEN BOND
Look for HF or any molecule having OH or NH
in its formula
DIPOLE-DIPOLE FORCE
Look for an asymmetric molecule
LONDON FORCE
Always present
LOOKING AT STRUCTURES TO DETERMINE POLARITY

Other than having permanent dipoles, if we look
at the structure of the molecules we can
determine if they will be polar molecules, or nonpolar molecules.
Molecular Polarity

Polar (H2O)
Molecular Polarity
Non-Polar
BF3 Boron Trifluoride
Polar Vs Non-Polar
Which of the following are expected to be polar and which are
expected to be nonpolar??
Methane (CH4)
Hydrogen Fluoride (HF)
Polar Vs Non-Polar
nonpolar = symmetrical
polar = asymmetrical
(if one end of the molecule
differs from the other)
Methane
Hydrogen fluoride
MORE EXAMPLES…
Borane (BH3)
BeF2
CH3Cl
SF2
SHAPES OF MOLECULES
C2H6
C3H8
Hydrocarbons are always non-polar
Hydrocarbons are compounds that contain only
carbon and hydrogen.
METHANOL CH3OH AND
ETHANOL
CH3CH2OH
FYI: FOR YOUR INFORMATION!
Methanol has a high toxicity in humans. If as little as
10 mL of pure methanol is ingested, it can break
down into formic acid, CH2O2 which can cause
permanent blindness by destruction of the optic
nerve!
Ethanol (Ethyl alcohol)
It is the main type of alcohol found in alcoholic drinks.
Ethanol is used as a solvent, an antiseptic, a fuel, in
modern thermometers.
HOMEWORK
PAGE 201
QUESTION 10
AND YES, THAT’S IT! 