High School

**1. Which boiling point corresponds to calcium chloride?**

A. 101.53°C
B. 100.00°C
C. 101.02°C
D. 100.51°C

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**2. Which of the following solutions will have the lowest freezing point?**

A. 1.0 mol/kg sucrose (C₁₂H₂₂O₁₁)
B. 1.0 mol/kg lithium chloride (LiCl)
C. 1.0 mol/kg sodium phosphide (Na₃P)
D. 1.0 mol/kg magnesium fluoride (MgF₂)

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**3. Which of the following compounds will be most effective in melting the ice on the roads when the air temperature is below zero?**

A. sodium iodide (NaI)
B. magnesium sulfate (MgSO₄)
C. potassium bromide (KBr)
D. All will be equally effective.

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**4. Four different solutions have the following vapor pressures at 100°C. Which solution will have the greatest boiling point?**

A. 98.7 kPa
B. 96.3 kPa
C. 101.3 kPa
D. 100.2 kPa

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**5. Four different solutions have the following boiling points. Which boiling point corresponds to a solution with the lowest freezing point?**

A. 101.2°C
B. 105.9°C
C. 102.7°C
D. 108.1°C

Answer :

  • The boiling point of calcium chloride has been [tex]\rm 101.53^\circ C[/tex]. This, option A is correct.

  • The solution with the lowest freezing point has been 1.0 mol/kg sodium phosphide. Thus, option C is correct.

  • All the compounds will be equally effective in melting the ice on the roads. Thus, option D is correct.

  • The solution with the greatest boiling point has vapor pressure 96.3 kPa. Thus, option B is correct.

  • The solution with the lowest freezing point has boiling point [tex]\rm 108.1^\circ C[/tex] Thus, option D is correct.

Boiling point and freezing point has been defined as the physical characteristics of the sample. It has been affected by the intermolecular force.

Boiling point and Freezing of different samples

  • The stronger the intermolecular force, the higher amount of energy has been required to change the state of the matter and thus have higher boiling and melting point.

In the following compounds, the increasing order of the intermolecular forces has been:

Water < Sucrose < NaCl < Calcium chloride

The boiling point has been the maximum for calcium chloride. Thus, the boiling point of [tex]\rm 101.53^\circ C[/tex]. This, option A is correct.

  • The freezing point has been the temperature of turning liquid into solid. The stronger intermolecular force, the lower will be the freezing point.

Thus, the solution with the lowest freezing point has been 1.0 mol/kg sodium phosphide. Thus, option C is correct.

  • The melting of ice has been achieved when there has been weak intermolecular force. All the molecules have same intermolecular force.

Thus, all the compounds will be equally effective in melting the ice on the roads. Thus, option D is correct.

  • The vapor pressure and boiling point are inversely proportional to each other. The higher the vapor pressure, the lower has been the boiling point.

Thus, the solution with the greatest boiling point has vapor pressure 96.3 kPa. Thus, option B is correct.

  • The freezing point and boiling point are inversely proportional to each other. The higher the boiling point, the lower has been the freezing point.

Thus, the solution with the lowest freezing point has boiling point [tex]\rm 108.1^\circ C[/tex] Thus, option D is correct.

Learn more about vapor pressure, here:

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