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Colligative Properties

Total questions: 43

Worksheet time: 2hrs 0mins

Name
Class
Date
1.
The boiling point of a solution is ______ the boiling point of the pure solvent.
a)
higher than
b)
the same as
c)
lower than
d)
higher or lower than
2.
Molality is measured in
a)
mols per kg
b)
mols per L
c)
mols per kJ
d)
mols per mL
3.
Which technique could increase or speed up the rate of dissolving?
a)
Allowing the mixture to settle
b)
Stirring the mixture
c)
Adding more powder
d)
Adding more water
4.
How many grams of sodium nitrate, NaNO3, are soluble in 100 g of water at 10 ºC?
a)
80 grams
b)
100 grams
c)
40 grams
d)
10 grams
5.
At 40˚C, at what point is the solution saturated with KCl?
a)
20g
b)
30g
c)
40g
d)
50g
6.
This solution would be considered
a)
Unsaturated
b)
Supersaturated
c)
Saturated
d)
Undefined
7.
This graph represents a(n) ___ solution
a)
saturated
b)
supersaturated
c)
unsaturated
d)
undefined
8.
The freezing point of a solution is ____ the freezing point of the pure solvent.
a)
the same as
b)
lower than
c)
higher than
d)
no relation to
9.
What is the freezing point of a 1.5 m solution of sucrose in water? (Kf = 1.86°C/m)
a)
-2.8°C
b)
-1.2°C
c)
-0.81°C
d)
0.81°C
10.
Colligative properties depend on the _________ of the solute but not the __________ of the solute.
a)
 concentration; identity
b)
identity; concentration
c)
reactivity; nature
d)
nature; reactivity
11.
A solution has 10 moles of ammonia in 2L of solution. What is the molarity? 
a)
5.0 M
b)
20 M
c)
0.5 M
d)
0.2 M
12.
How many moles of HNO3 are needed to prepare 5L of a 2M solution? 
a)
10 mol
b)
2.5 mol
c)
0.4 mol 
d)
100 mol 
13.
What is the boiling point of a solution if 5.76 mol NaF is dissolved in 3.62 kg of water? (Kb=0.512*C/m)
a)
0.81*C
b)
101.62*C
c)
100.81*C
d)
103.1*C
14.
What is the dissociation factor (i.e. van't Hoff factor) for the compound CH3OH?
a)
1
b)
3
c)
6
d)
9
15.
What is the dissociation factor (i.e. van't Hoff factor) for the compound Na2SO4?
a)
1
b)
3
c)
5
d)
7
16.

When CH3OH is dissolved in water, how many particles are in solution?

a)

1

b)

3

c)

4

d)

5

e)

6

17.

When KCl (potassium chloride) is dissolved in water, how many particles are in solution?

a)

1

b)

2

c)

3

d)

4

e)

6

18.

When CaBr2 is dissolved in water, how many particles will be in solution?

a)

1

b)

2

c)

3

d)

4

e)

5

19.

When 11.0 g of CaCl2 dissolves in 45.0 g of water, what is the boiling point of the solution? (Kb = 0.512 oC/m)

a)

3.4

b)

103.4

c)

101.1

d)

1.1

e)

101.4

20.

Find the boiling point of a solution containing 15.0 g sucrose (molar mass = 342.3g/mol), in 100g of water. (Kb = 0.512 oC/m)

a)

100.2

b)

99.8

c)

0.2

d)

-0.2

21.

Which salt below has the largest effect on freezing point?

a)

C2H4O2

b)

H2S

c)

LiBr

d)

CaF2

22.

When 26.0 g of NaCl, are dissolved in 0.5 kg of water, what is the freezing point of this solution? (Kf = 1.86 oC/m)

a)

-3.3

b)

103.3

c)

-1.7

d)

-0.8

23.

A solution contains 15.5 g of a nonelectrolyte and 200 g of water. The water freezes at -4.5° C and Kf = 1.86° C/m. What is the molar mass of the nonelectrolyte?

a)

18g/mol

b)

32g/mol

c)

16g/mol

d)

46g/mol

e)

53g/mol

24.

Using the graph above, which compound would dissolve the fastest at 20° C, KCl, NaCl, KNO3, or KClO3?

a)

KCl

b)

NaCl

c)

KNO3

d)

KClO3

25.

A solution that has the maximum amount of solute dissolved in the solvent is called __________________.

a)

saturated

b)

supersaturated

c)

unsaturated

d)

suspension

26.

How many grams of NaCl need to be dissolved in 50g of water to make a 0.2m solution?

a)

1.8g

b)

0.1g

c)

1.6g

d)

0.6g

27.

A solution that has less than the maximum amount of solute dissolved in the solvent is called __________________.

a)

saturated

b)

supersaturated

c)

unsaturated

d)

suspension

28.

How many grams of NaCl need to be dissolved in 50g of water to make a 0.2m solution?

a)

1.8g

b)

0.1g

c)

1.6g

d)

0.6g

29.

Using the graph above, how many grams of KCl can be dissolved in 300g of water at 40° C?

a)

30g

b)

50g

c)

120g

d)

40g

30.

A solution contains 25 g of a nonelectrolyte and 80 g of water. The water boils at 104.7° C and Kb = 0.512° C/m. What is the molar mass of the nononelectrolyte?

a)

34g/mol

b)

17g/mol

c)

11g/mol

d)

28g/mol

e)

46g/mol

31.
What observation(s) reflect(s) colligative properties?
I. A 0.5 m NaBr soln has a higher vapor pressure than 0.5 m BaCl2 soln.
II. A 0.5 m NaOH soln freezes at a lower T. than pure water.
III. Pure water freezes at a higher T than pure methanol.
a)
only I
b)
only II
c)
only III
d)
1 & II
32.
The boiling point of a solution is ______ the boiling point of the pure solvent.
a)
higher than
b)
the same as
c)
lower than
d)
higher or lower than
33.
The freezing point of a solution is ____ the freezing point of the pure solvent.
a)
the same as
b)
lower than
c)
higher than
d)
no relation to
34.

The vapor pressure of a pure solvent is ___________ that of a solution

a)

more than

b)

less than

c)

equal to

35.

Solution A contains 0.1 mol of sucrose, dissolved in 500. g of water. Solution B contains 0.1 mol of sodium chloride, dissolved in 500. g of water. Which fo the following statements about theses solutions is true?

a)

Both solutions have the same vapor pressure.

b)

Solution A would boil at a higher temperature than solution B would.

c)

Solution A would freeze at a higher temperature than solution B would.

d)

Both solutions would boil at the same temperature.

36.
Colligative properties depend on the _____ of solute particles in solution.
a)
type
b)
number
c)
pH
d)
nature
37.

What is the boiling point of a solution if 5.76 mol CO2 is dissolved in 3.62 kg of water? (Kb=0.512*C/m)

a)

0.81*C

b)

100.81*C

c)

99.19*C

d)

103.1*C

38.
What is the freezing point of a 1.5 m solution of sucrose in water? (Kf = 1.86°C/m)
a)
-2.8°C
b)
-1.2°C
c)
-0.81°C
d)
0.81°C
39.
What is the freezing point of a 1.5 m solution of sucrose in water? (Kf = 1.86°C/m)
a)
-2.8°C
b)
-1.2°C
c)
-0.81°C
d)
0.81°C
40.

A solution made by dissolving 9.81 g of a nonvolatile nonelectrolyte in 90.0 g of water boiled at 100.37 oC. What is the approximate molar mass of the substance? Kb=0.51 oC/m

a)

240 g/mol

b)

150 g/mol

c)

79 g/mol

d)

61 g/mol

41.

Which one of the following diagrams has the lowest vapor pressure?

a)

1

b)

2

c)

3

d)

4

e)

5

42.

142 g of sodium sulfate, Na2SO4, are dissolved in 875 g of H2O. (Assume 100% ionization)


What will be the freezing point of the resulting solution?


(Mr Na2SO4 = 142; Kf =1.86)

a)

−4.3 oC

b)

−4.5 oC

c)

−3.8 oC

d)

−6.4 oC

43.

Which of the following is a colligative property

a)

Lowering of vapor pressure

b)

Relative lowering of vapor pressure

c)

Both

d)

None

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