PreAP Chem Colligative Properties Quiz

Which of these is a correct colligative property

• Boiling point depression

• Freezing point elevation

• Vapor pressure lowering

• Vapor pressure elevation

The freezing point of a solution is ___________ that of a pure solvent

• more than

• less than

• equal to

The boiling point of a solution is ___________ that of a pure solvent

• more than

• less than

• equal to

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

• more than

• less than

• equal to

The temperature at which the vapor pressure of the liquid phase equals atmospheric pressure is called

• Boiling point

• Melting point

• Freezing point

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?

• Both solutions have the same vapor pressure.

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

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

• Both solutions would boil at the same temperature.

molality is

• the moles of solute in 1g of solvent

• the moles of solute in 1g of solution

• the moles of solute in 1kg of solvent

• the moles of solute in 1kg of solution

Calculate the approximate boiling point (in ^oC) of a solution of 285 g of magnesium chloride in 2.0 kg of water. (K_b=0.51 ^oC/m)

• 103.1 ^oC

• 101.6 ^oC

• 102.3 ^oC

• 104.8 ^oC

Which of the following is not a colligative property?

• molality

• vapor-pressure lowering

• boiling-point elevation

• freezing-point depression

Calculate the approximate boiling point (in ^oC) of a solution of 285 g of magnesium chloride in 2.0 kg of water. (K_b=0.51 ^oC/m)

• 103.1 ^oC

• 101.6 ^oC

• 102.3 ^oC

• 104.8 ^oC