Lesson Worksheet: Vapor Pressure Chemistry

In this worksheet, we will practice explaining vapor pressure, its relation to boiling point, and the factors that affect vapor pressure.

Q1:

In a closed system, a constant vapor pressure results from the formation of a dynamic equilibrium between the vapor and the liquid. At this equilibrium, which two opposing processes are occurring at the same rate?

  • AThe diffusion of the liquid and the effusion of the vapor
  • BThe evaporation of the liquid and the diffusion of the vapor
  • CThe evaporation of the liquid and the condensation of the vapor
  • DThe self-ionization of water and the condensation of the vapor
  • EThe breaking of chemical bonds and the formation of chemical bonds

Q2:

Which of the following factors does not affect the vapor pressure of a liquid?

  • AVolume of the liquid
  • BTemperature
  • CIntermolecular forces
  • DConcentration of solutions

Q3:

The given graph shows vapor pressure against temperature for three solutions of NaCl and pure water. Which solution has the highest concentration?

  • ASolution A
  • BSolution B
  • CSolution C

Q4:

The image below shows three manometers, each containing a sample of ethanoic acid. For which manometer is the temperature of the ethanoic acid the highest?

  • AA
  • BB
  • CC

Q5:

A chemist is given three different liquids and wants to determine which one is the most volatile. The chemist places an equal volume of each liquid into a manometer and ensures the temperature of all three liquids is the same. According to the image below, which liquid is the most volatile?

  • APropanol
  • BEthylene glycol
  • CDiethyl ether

Q6:

Which of the following liquids would have the greatest vapor pressure at 25C?

  • A
  • B
  • C
  • D
  • E

Q7:

The given graph shows the vapor pressure for several liquids against temperature.

Which liquid is the most volatile?

  • AAcetone
  • BTetrahydrofuran
  • CWater
  • DPropan-2-ol
  • EEthanoic acid

Which liquid has the highest boiling point?

  • AAcetone
  • BPropan-2-ol
  • CEthanoic acid
  • DTetrahydrofuran
  • EWater

At what atmospheric pressure will acetone boil at 50C?

  • A100 kPa
  • B38 kPa
  • C80 kPa
  • D20 kPa
  • E50 kPa

Q8:

Which of the following solutions would you expect to have the lowest vapor pressure? Assume all solutions are at the same temperature.

  • A0.2 M solution of urea
  • B0.2 M solution of MgSO4
  • C0.2 M solution of KCl
  • D0.2 M solution of AlCl3
  • E0.2 M solution of LiBr

Q9:

Which of the following statements is not correct?

  • AThe freezing point of the solution is higher than that of the pure solvent.
  • BThe boiling point of the pure solvent is lower than that of the solution.
  • CThe freezing point of the solution is lower than that of the pure solvent.
  • DThe vapour pressure of the pure solvent is higher than that of the solution.

Q10:

3 spoons of sugar were added to a cup of water to form a solution. Which one of the following is considered a false statement?

  • AThe vapour pressure of the solution is higher than that of pure water.
  • BThe vapour pressure of the solution is lower than that of pure water.
  • CThe boiling point of the solution is higher than that of pure water.
  • DWhen the amount of sugar is increased, the boiling point of the solution increases.

This lesson includes 18 additional questions and 15 additional question variations for subscribers.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.