Colligative Properties

Question 1

A student lives in a place that receives lots of snow and ice during the winter. The student has observed that the highway department spreads salt on the road after a snowfall. Which of the following correctly explains why the highway department uses salt on the roads?

Revolt · Accepted Answer

S: Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.

Question 2

A student placed equal volumes of honey and of water in two, identical, open dishes, and left them at room temperature for 8 hours. She observed that the amount of water decreased, but the amount of honey seemed unchanged. Knowing that honey is a highly concentrated solution of sugar in water, which statement should the student make to explain this phenomenon?

Revolt · Accepted Answer

H: Honey has a much lower vapor pressure than pure water has. So, pure water evaporates at a much higher rate.

Question 3

If you make a solution by dissolving 1.0 mol of FeCl3 into 1.0 kg of water, how would the osmotic pressure of this solution compare with the osmotic pressure of a solution that is made from 1.0 mol of glucose in 1.0 kg of water?

Revolt · Accepted Answer

f: four times as large

Question 4

How would the vapor pressure of a solution that contains 0.5 mol of CaCl2 in 1.0 kg of water compare with the vapor pressure of a solution that contains 1.5 mol of glucose in 1.0 kg of water?

Revolt · Accepted Answer

t: the same

Question 5

A solution contains 6.21 g of ethylene glycol dissolved in 25.0 g of water. If water has a boiling point elevation constant of 0.512°C•kg/mol, what is the boiling point of the solution? (molar mass of ethylene glycol = 62.1 g/mol; boiling point of pure water = 100.00°C)Use .

Revolt · Accepted Answer

1: 102.05°C

Question 6

The osmotic pressure of a solution increases as

Revolt · Accepted Answer

t: the number of particles of solute in the solution increases.

Question 7

How are the boiling point and freezing point of a solvent affected when a solute is added?

Revolt · Accepted Answer

T: The boiling point increases, and the freezing point decreases.

Question 8

The freezing point of pure chloroform is -63.5°C, and its freezing point depression constant is 4.07°C•kg/mol. If the freezing point of a solution of benzoic acid in chloroform is -70.55°C, what is the molality of this solution?Use .

Revolt · Accepted Answer

1: 1.7 m

Question 9

A student stirs 2 tablespoons of honey into a glass of water. How will the addition of honey affect the water’s colligative properties?

Revolt · Accepted Answer

T: The water’s osmotic pressure will increase, and its vapor pressure will decrease.

Question 10

Which statement about electrolytes and nonelectrolytes is not true?

Revolt · Accepted Answer

E: Electrolytes disperse as molecules in a solution.

Colligative Properties Answers

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