Physical Science Institute
Summer 2013
Solutions
Self-Assessment
____1. A colloid forms when FeCl3 hydrolyzes in hot water. This type of mixture will:
A. separate into layers after standing a few minutes.
B. scatter light & will appear cloudy.
C. be separated using filter paper.
D. have all the characteristics described above
____2. Which of the following is a characteristic of an aqueous solution of sugar?
A. The dissolved sugar will settle to the bottom of the container.
B. More sugar will be dissolved at the top of the solution than the bottom.
C. The solution will scatter light and look cloudy.
D. The particles in solution are molecular in size.
____3. Differences in the properties of aqueous mixtures (suspensions, colloids, solutions) are best explained by
differences in
A. heat of fusion
C. chemical reactivity with water
B. particle size of the components
D. density
____4.
____5. If 25 mL of methyl alcohol is dissolved in 100 mL of water, will the resultant volume of the solution be greater
than, less than, or equal to 125 mL?
A. Less than 125 mL
B. Greater than 125 mL
C. Equal to 125 mL
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Physical Science Institute
Summer 2013
____6. If 25 grams of methanol is dissolved into 100 grams of water, will the resultant mass of the solution be less than,
greater than, or equal to 125 grams?
A. Less than 125 grams
B. Greater than 125 grams
C. Equal to 125 grams
____7.
____8. In saturated solutions containing some undissolved solid;
A. addition of a single crystal of solute will cause excess solute to crystallize out.
B. will appear cloudy due to the scattering of light by the solute particles.
C. dissolving of solute occurs, but at the same time the solute is coming out of solution at the same rate.
D. there is always a high concentration of the solute.
____9. The main factor, of the factors listed,in determining the solubility of a solute in a solvent is:
A. The density of the solute compared to the solvent.
B. The size of the solute particles compared to the solvent particles.
C. The attraction of the solute particles to the solvent particles
D. The size of the air spaces between the solute particles compared to the solvent particles
___10. Which of the following is not a characteristic property of matter?
A. Mass
B. Density
C. Solubility
D. Freezing point
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Physical Science Institute
Summer 2013
___11. A student does an investigation—much like you did in the investigation “Frozen Solid”—to determine the effect
of ethylene glycol on the freezing point of water. Which temp-time graph would most likely result?
Graph A
Graph B
5
TEMP
o
C
5
TEMP
o
C
0
0
-5
-5
Time (sec)
Time (sec)
Graph C
Graph D
5
TEMP
o
C
5
TEMP
o
C
0
-5
0
-5
Time (sec)
Time (sec)
12. A gas measuring tube is filled half-way with water. The remaining volume of the tube is slowly filled with alcohol so
as to minimize mixing between the alcohol and water. After slightly over filling the tube, a stopper is put in place to seal
the tube and push out any excess alcohol so that there is no air trapped in the tube. The tube is then inverted many
times to mix the alcohol and water.
Your instructor will now demonstrate what happens in the tube when it is sealed and inverted until the liquids mix
completely. Both liquids have been dyed so that you can more easily observe any changes that occur.
After you have made your observations, give an explanation of the results of mixing alcohol and water in a sealed tube.
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