Lesson Worksheet: Vapor Pressure Chemistry

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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 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?

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:

A student dissolves 20 g of a non-electrolyte substance with molar mass 80 g/mol in 500 g of water. Then, he observes that the freezing point of the solution decreases by .

Q7:

Which of the following is not true about the boiling point of a solution?

AThe boiling point of an aqueous solution of is nearly the same as the boiling point of an aqueous solution of .
BThe boiling point of pure is higher than the boiling point of an aqueous solution of .
CThe boiling point can be used as an indicator of the purity of the solvent.
DThe boiling point of an aqueous solution of is higher than the boiling point of an aqueous solution of .

Q8:

What is the boiling point of a molal solution of calcium carbonate when 1 mole of its ions is dissolved in 1 L of water, causing the boiling point of the water to change by ?