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Final Review Ch. 18
Final Review Ch. 18
12
Chemistry
11th Grade
05/26/2006

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Term
Which of the following pairs of substances are miscible?
a. water and ethanol
b. water and oxygen
c. water and sodium chloride
d. water and gasoline
Definition
a.water and ethanol
Term
Holding the temperature constant while adding more solute to a solution that already has solute crystals at the bottom of the container causes ______.
Definition
more solute crystals to appear at the bottom of the container
Term
If the pressure of a gas above a liquid is increased (at constant temperature), the solubility of the gas in the liquid ____.
Definition
Increases
Term
How does solubility generally vary as the temperature increases?
Definition
Solubility increases
Term
A dilute solution is one in which there is a ___ amount of solute in a _____ amount of solvent.
Definition
small, large
Term
If a crystal added to an aqueous solution causes many particles to come out of solution, the original solution was ____.
Definition
Supersaturated
Term
Increasing the temperature of a solution will generally ____ and ______.
Definition
Increase the rate at which a solute dissolves and increase the amount of solute that dissolves
Term
In a concentrated solution there is _____.
Definition
a large amount of solute
Term
What DOES NOT change when a solution is diluted by the addition of solvent?
Definition
number of moles in solution
Term
Which of the following is NOT a colligative property of a solution?
a. its molarity decreases
b. supersaturation
c. vapor pressure lowering
d. freezing point depression
Definition
b. supersaturation
Term
Colligative properties depend upon_____.
Definition
the number of particles dissolved in a given mass of solvent.
Term
Why does solute depress the freezing point?
Definition
because the solute dirupts crystal formation by the solvent.
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