Molecule Polarity and Solubility
Name: ___________________________________________
Date: ____________
Purpose:
To predict whether two substances will form a solution based on the polarity of the
molecules.
Equipment: Molecular model building set
Procedure:
1. Complete the data chart below and answer the conclusion questions by constructing
molecules with the kit, using this color key:
Black = Carbon
Red = Oxygen
Yellow = Hydrogen
Green = Chlorine
Blue = Nitrogen
Orange = Bromine
Conclusion Questions:
1. How could you tell if a molecule was polar of not?
2. How many of the molecules you built were polar? _____
3. How many of the molecules you built were nonpolar? _____
4. What type of molecule can dissolve in a polar solvent (polar or nonpolar)?
5. Will chlorine form a solution with ethyne? Why or why not?
6. Will carbon dioxide dissolve in ammonia? Why or why not?
7. Is hydrogen peroxide soluble in water? Why or why not?
8. Motor oil is nonpolar; which would be a better solvent to get a motor oil stain out of your
clothes – water or cyclohexane? Why?
9. Iodine is a diatomic element. Knowing that, explain why you would not be able to clean
up an iodine spill with water.
10. If you dissolved 10g of hydrogen bromide in 100g of methanol, which part would be
considered the solute? How do you know?
1
Is it
Structural Representation Symmetrical in Is it Polar?
3D?
Name
Formula
Chlorine
Cl2
Cl—Cl
NH3
H—N—H
|
H
2
Ammonia
3
Ethyne
C2H2
H—C==C—H
Cl
|
H—C—Cl
|
H
4
Dichloromethane
CH2Cl2
5
Nitrogen
N2
N==N
6
Carbon
Dioxide
CO2
O==C==O
H
|
H—O—C—H
|
H
7
Methanol
CH3OH
8
Hydrogen
Peroxide
H2O2
H—O==O—H
9
Water
H2O
H—O—H
H
C
10 Cyclohexane
C6H6
/
HC
|
HC
\
\
CH
|
CH
/
C
H
11
Hydrogen
Bromide
HBr
H—Br