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Topic 7 – Solutions .
20. Vapor pressure and boiling: Recalling definitions and facts
1. As the temperature of a liquid increases, its vapor pressure
1) Decreases 2) Increases 3) Remains the same
2. As water in a sealed container is cooled from 20 C to 10 C, its vapor pressure
o
o
1) Decreases 2) Increases 3) Remains the same
3. When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid will
1) Freeze 2) Melt 3) Boil 4) Condense
4. Given the diagram below.
Teacher Preview Copy
Liquid A is confined in a container. The equilibrium vapor pressure of liquid A depends on the
1) Amount of vapor in the container 3) Amount of liquid in the container
2) Size of the confining container 4) Temperature of liquid A
5. The vapor pressure of H2O is less than that of CS2. The best explanation for this is that H2O has
1) Larger molecules 3) Stronger ionic bonds
2) A larger molecular mass 4) Stronger intermolecular forces
1) 80 C Teacher Preview Copy
21. Vapor pressure and boiling: Determining vapor pressure and temperature.
o
1. According to Reference Table H, what is the vapor pressure of propanone at 50 C?
1) 101.3 kPa 2) 33 KPa 3) 50 kPa 4) 82 kPa
o
2. A sample of a pure liquid is boiling at a temperature of 150 C. The atmospheric pressure is 65 kPa. The
vapor pressure of the liquid is
1) 10 kPa 2) 65 kPa 3) 150 kPa 4) 101.3 kPa
3. According to Reference Table H, which sample has the highest vapor pressure? o
o
o
o
2) Propanone at 65 C 3) Ethanol at 75 C
1) Water at 70 C
4) Ethanoic acid at 110 C
4. The normal boiling point of ethanol is closest to
o
o
o
o
2) 100 C 3) 200 C 4) 90 C
5. Which sample of water has the lowest vapor pressure? o
o
o
o
1) 100 ml at 50 C 2) 200 mL at 30 C 3) 300 ml at 40 C 4) 400 ml at 20 C
6. The vapor pressure of a liquid is 0.92 atm at 60 C. The normal boiling point of the liquid could be
o
1) 35 C 2) 45 C 3) 55 C 4) 65 C
o
o
o
o
o o
7. A liquid has a vapor pressure of 90 kPa at 75 C and a vapor pressure of 120 kPa at 90 C. At standard
atmospheric pressure, the liquid will boil
o
o
1) At 75 C 3) Above 75 C but below 90 C
o
o
o
o
2) At 90 C 4) Above 90 C but below 100 C
244 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
20. Vapor pressure and boiling: Recalling definitions and facts
1. As the temperature of a liquid increases, its vapor pressure
1) Decreases 2) Increases 3) Remains the same
2. As water in a sealed container is cooled from 20 C to 10 C, its vapor pressure
o
o
1) Decreases 2) Increases 3) Remains the same
3. When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid will
1) Freeze 2) Melt 3) Boil 4) Condense
4. Given the diagram below.
Teacher Preview Copy
Liquid A is confined in a container. The equilibrium vapor pressure of liquid A depends on the
1) Amount of vapor in the container 3) Amount of liquid in the container
2) Size of the confining container 4) Temperature of liquid A
5. The vapor pressure of H2O is less than that of CS2. The best explanation for this is that H2O has
1) Larger molecules 3) Stronger ionic bonds
2) A larger molecular mass 4) Stronger intermolecular forces
1) 80 C Teacher Preview Copy
21. Vapor pressure and boiling: Determining vapor pressure and temperature.
o
1. According to Reference Table H, what is the vapor pressure of propanone at 50 C?
1) 101.3 kPa 2) 33 KPa 3) 50 kPa 4) 82 kPa
o
2. A sample of a pure liquid is boiling at a temperature of 150 C. The atmospheric pressure is 65 kPa. The
vapor pressure of the liquid is
1) 10 kPa 2) 65 kPa 3) 150 kPa 4) 101.3 kPa
3. According to Reference Table H, which sample has the highest vapor pressure? o
o
o
o
2) Propanone at 65 C 3) Ethanol at 75 C
1) Water at 70 C
4) Ethanoic acid at 110 C
4. The normal boiling point of ethanol is closest to
o
o
o
o
2) 100 C 3) 200 C 4) 90 C
5. Which sample of water has the lowest vapor pressure? o
o
o
o
1) 100 ml at 50 C 2) 200 mL at 30 C 3) 300 ml at 40 C 4) 400 ml at 20 C
6. The vapor pressure of a liquid is 0.92 atm at 60 C. The normal boiling point of the liquid could be
o
1) 35 C 2) 45 C 3) 55 C 4) 65 C
o
o
o
o
o o
7. A liquid has a vapor pressure of 90 kPa at 75 C and a vapor pressure of 120 kPa at 90 C. At standard
atmospheric pressure, the liquid will boil
o
o
1) At 75 C 3) Above 75 C but below 90 C
o
o
o
o
2) At 90 C 4) Above 90 C but below 100 C
244 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
