Academie Ste. Cecile International School
SCH3U – Chemistry 11
Practice Problems – Predicting the polarity of a molecule
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Date:
Part 1 – Questions
1. What is a polar covalent bond and which types of atoms form them when bonded
together?
2. If a molecule contains a polar covalent bond does that make the entire molecule polar
explain?
3. What is the main difference between a polar molecule and a non polar molecule?
Part 2 – Predicting Polarity
Instruction – By Building the following molecules and then drawing the appropriate Lewis dot
diagram and structural diagram you will predict the polarity of each of the molecules. Make sure
you fully label the dipoles on each atom and show the flow of electrons in each bond for the
structural diagram.
Molecule
Urea – H2NCONH2
Formaldehyde –
CH2O
Hydrogen Cyanide
– HCN
Chloroflorocarbon
– CCl2F2
Amino Acid –
H2NCOOH
Lewis Dot Diagram
Structural Diagram
Trimethylamine –
(CH3)3N
Ethanol – C2H5OH
Ethanoic acid
(Vinegar) –
H3CCOOH
Methyl Ether –
CH3OCH3
Acetone –
CH3COH
Octane – C8H18
Prop – 1 – ene –
CH3CHCH2
Chloral Hydrate –
Cl3CCH(OH)2
Lactic Acid –
H3CCH(OH)COOH