ChemistryMultiple Choice
Standard VI, Objective 2
a1. Which of the following could be a qualitative effect of a colligative property on a solution when a solute is added?
A. The solution does not form a solid until the temperature is below the solvent’s normal freezing point
B. The solution appears to form a solid when the temperature is above the solvent’s normal freezing point
C. The solution’s freezing point is 10 C cooler than the solvent’s normal freezing point
D. The solution’s freezing point is 10 C higher than the solvent’s normal freezing point
a2. Which of the following could be a quantitative effect of a colligative property on a solution when a solute is added?
A. The solution appears to liquefy below the solvent’s normal freezing point
B. The solution liquefies more slowly than before when above the freezing point.
C. The solution’s freezing point is 10 C cooler than the solvent’s normal freezing point
D. The solution’s freezing point is higher than the solvent’s normal freezing point
a3. What determines the colligative properties of a solution?
A. the type of solvent used.
B. the type of solute used.
C. the ratio of solute particles to solvent
D. the type and amount of solvent and solute.
a4. Which of the following could be a qualitative effect of a colligative property on a solution when a solute is added?
A. Osmotic pressure increases in a solution with a high sugar solute concentration.
B. Osmotic pressure decreases in a solution with a high sugar solute concentration.
C. The solution’s freezing point is 10 C cooler than the solvent’s normal freezing point
D. The solution’s freezing point is 10 C higher than the solvent’s normal freezing point
b5. On the graph to the right, why is
the molality identified but not the solute?
A. Freezing point is a colligative property
and does not depend on the substance.
B. It was mistakenly left off.
C. Any solvent will have the same molality
as any other.
D. It is assumed that salt is the solute
Because it is common.
The results of an experiment with boiling water are shown below. A mole of salt was added every five minutes to the solution. Use this data to answer the next two questions:
Time / Moles of salt / Boiling pt. temperature (degrees C)0 / 0 / 100
5 / 1 / 102
10 / 2 / 104
15 / 3 / 106
20 / 4 / 108
25 / 5 / 110
b6. How should the data be displayed on a graph to display the colligative property?
A. Temperature over time
B. Time over temperature
C. Molal concentration of salt over time
D. Molal concentration of salt over temperature
b7. Which conclusion is most correct for these results?
A. Increasing the molal concentration of salt increases the boiling point of water.
B. Molal concentration is indirectly related to boiling point temperature of water.
C. Adding more salt increases the boiling point temperature.
D. Salt water boils at different temperatures than fresh water.
c8. Why is antifreeze put into cars during the summer in climates where the temperature doesn’t drop below 15 C? Antifreeze causes water
A. to boil at a higher temperature, so water remains a liquid at high temperatures.
B. to boil at a lower temperature, so liquid water can move through and cool the engine
C. to boil at a higher temperature, so more water vapor can build up in the radiator
D. to boil at a lower temperature, so more water vapor can build up in the radiator
c9. Which of the following statements best explains why road salt is added to the roads in the winter?
A. Road salt is gritty and provides more traction for the tires
B. Road salt is lowers the boiling point of water so less water will evaporate.
C. Road salt raises the freezing point of water and provides a layer of ice to drive on.
D. Road salt lowers the freezing point of water causing more ice to melt off the road.
c10. Which of the following is a way people use an understanding of colligative properties?
A. using antifreeze in a car's radiator.
B. boiling the fractions out of crude oil.
C. building an battery that will recharge when the car is moving.
D. using enzymes to remove the stains from a fabric.
c11. Two students are having a disagreement about salt on icy roads. Student A says that the amount of salt doesn't matter and Student B says it does make a difference. Who is correct?
A. Student A is correct, the salt can only work on the top layer of ice.
B. Student A is partially correct, the salt has to cover the entire top surface of the ice.
C. Student B, the more salt added, the lower the melting point of the ice.
D. Student B, the more salt added, the higher the melting point of the ice.
Key
1. A
2. C
3. C
4. A
5. A
6. D
7. A
8. A
9. D
10. A
11. C