Boiling and Freezing Points Worksheet

Which of the following factors doesn’t affect the boiling point of the solution?

• A) Atmospheric pressure

• B) Concentration of the solution

• C) Volume of the solution

• D) The number of solute ions

Which of the following sugar solutions has the highest boiling point?

• Solution of concentration 10 g/L

• Solution of concentration 5 g/L

• Solution of concentration 9 g/L

• Solution of concentration 1 g/L

If the freezing point of a pure solvent is 0ºC, what will the freezing point if 5 g of salt is dissolved in it?

• Less than 0ºC

• Higher than 0ºC

• Equals 0ºC

• 4ºC

If the boiling point of a solution at a mountaintop is 108ºC, therefore the boiling point of the same solution on the Earth’s surface is:

• 106ºC

• 104ºC

• 108ºC

• 110ºC

The depression in the freezing point of an aqueous solution compared to the freezing point of pure water is due to:

• the presence of solute particles lowering the vapor pressure

• an increase in atmospheric pressure

• the increase in temperature of the solution

• the decrease in volume of the solvent

Why are salts spread on roads in cold regions after rainfall?

• Due to the decrease in the freezing point of the salt solution

• Due to the increase in the freezing point of the salt solution

• Due to the increase in the vapor pressure of water

• Due to the decrease in the vapor pressure of water

The solution is characterized from pure solvent by:

• Having low vapor pressure

• The depression in the boiling point

• The absence of osmotic pressure

• The elevation of the freezing point

Which of the following is an increase leading to decreasing the vapor pressure of solutions?

• Number of solvent molecules

• Number of solute molecules

• Temperature

• The amount of solution

Which of the following statements is correct?

• The number of water vapor molecules that are released from solutions is less than that released from pure water under the same conditions

• Attraction forces among water molecules each other are stronger than the attraction forces between water molecules and solute molecules

• The vapor pressure value in solutions is greater than its value in pure water

• The depression in vapor pressure is inversely proportional to the number of solute ions in the solution

If the boiling point of acetic acid at 1 atm pressure equals 118°C, it is expected that its boiling point at 0.8 atm pressure equals:

• 111°C

• 118°C

• 119°C

• 125°C