Colligative Properties — Quiz

Question 1

Which graph correctly shows the effect on the freezing point caused by increasing the molality of a solution ?

Revolt · Accepted Answer

Image with description A graph has a horizontal axis labeled as molality and a vertical axis labeled as F subscript P. The horizontal axis ranges from negative 2 to 6 in increments of 1 and the vertical axis ranges from negative 9 to 2 in increments of 1. The graph has five plotted points at (0 comma 0), (1 point 0 comma negative 1 point 8), (2 point 0 comma negative 3 point 8), (3 point 0 comma negative 5 point 4), and (4 point 0 comma negative 7 point 2).

Question 2

If you make a solution by dissolving 1 point 0 mol of FeCl sub 3 into 1 point 0 kilograms of water, how would the osmotic pressure of this solution compare with the osmotic pressure of a solution that is made from 1 point 0 mol of glucose in 1 point 0 kilograms of water?

Revolt · Accepted Answer

four times as large

Question 3

Which statement about electrolytes and nonelectrolytes is not true?

Revolt · Accepted Answer

Electrolytes disperse as molecules in a solution.

Question 4

The freezing point of pure chloroform is negative 63 point 5 times degree C , and its freezing point depression constant is 4 point 0 7 times degree C times kg/mol If the freezing point of a solution of benzoic acid in chloroform is negative 70 point 5 5 times degree C , what is the molality of this solution? Use triangle cap t sub f is equal to cap k sub f m

Revolt · Accepted Answer

1 point 7 m

Question 5

A group of students is in the laboratory performing an experiment on the effect of adding salt to water. Which observation are students likely to make as they increase the molality of the saltwater solution?

Revolt · Accepted Answer

As the molality increases by 1 m , there is a corresponding decrease of 1 point 8 6 times degree C in the solution’s freezing point.

Question 6

A set of four 15 point 0 - mL solutions—each in a similar open dish—was left at room temperature, and the amount that remained was recorded after every hour. Which of the solutions do you expect to be the first to completely evaporate from the open dish?

Revolt · Accepted Answer

0 point 2 5 m Na sub 2 SO sub 4

Question 7

Saline is a solution that contains a certain amount of NaCl and is designed to have the same osmotic pressure as normal blood cells. Doctors often give saline to patients who have lost blood. Which of the following explains why glucose of the same molality cannot attain the same effect as saline?

Revolt · Accepted Answer

Each formula unit of NaCl will give two particles because of ionization, but each molecule of glucose dissolves to give only one particle. Osmotic pressure for glucose will be lower than is required.

Question 8

Which of the following is a nonelectrolyte?

Revolt · Accepted Answer

cap c sub 6 cap h sub 12 cap o sub 6

Question 9

A set of four 15 point 0 - mL solutions—each in a similar open dish—was left at room temperature, and the amount that remained was recorded after every hour. Which of the solutions do you expect to be the first to completely evaporate from the open dish?

Revolt · Accepted Answer

0 point 2 5 m Na sub 2 SO sub 4

Question 10

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

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

Colligative Properties — Quiz Answers

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