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Home , Boiling point, Vapor pressure

101.325 kPa = 760.0 = 760.0 mmHg = 1.00 atm = atmospheric Name ______Pd_____

Vapor Pressure and

The following graph shows pressure curves for two substances, A and B.

800

700

600

Hg) 500

400 A

300

Pressure (mm B

200

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Temperature (°C) Answer the following questions.

1. What is the of A at 35 °C? 1. ______

2. What is the vapor pressure of B at 35 °C 2. ______

3. At what is the vapor pressure of A 800 mm?` 3. ______

4. What is the vapor pressure of B at this temperature? 4. ______

5. At what temperature is the vapor pressure of A equal to your 5. ______answer to Questions 4?

6. What is meant of “normal ? 6. ______

______

7. What is the normal boiling point of A? 7. ______

8 What is the normal boiling point of B? 8. ______

9. At what temperature would A boil if 9. ______were 700 mm?

10. What would the atmospheric pressure have to be in order for B to 10. ______boil at the temperature you gave as your answer to Question 9?

CHCl3 CCl4 H2O A and B are ; The others are points on the graph 101.325 kPa G 100

E F 80 B

Liquid Gas 60 C D A 40 Liquid

Solid Vapor(kPa) Pressure 20 Temperature

Energy

0 Figure 2 20 40 60 80 100 Temperature (°C)

Figure 1

Use Figure 1 to answer the following questions.

1. What will the boiling point of CHCl3 be when the atmospheric 1. ______pressure exerted on its surface is 101.325 kPa?

2. What is the normal boiling point for CCL4? 2. ______

3. What is the pressure when boils at 70 °C? 3. ______

4. Which liquid on the graph has that exert the strongest 4. ______attractive forces with each other?

5. Does increasing the temperature of a liquid cause its vapor pressure 5. ______to increase or decrease?

6. Which of the in Figure 1 would be easiest to evaporate? 6. ______

Use Figure 2 to answer the following questions.

7. Identify the point of the graph where each of the following occurs.

______a. begins ______c. boiling begins

______b. begins ______d. begins

8. Does the substance give off or take in as it goes from D to C? 8. ______

Name ______Date ______Per. _____

Vapor Pressure and Boiling

The following graph shows vapor pressure curves for two substances, A and B.

800

700

600

500

400 A

300

Pressure (mm Hg) B

200

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Temperature (°C) Answer the following questions.

1. What is the vapor pressure of A at 35 °C? 1. ______ 150 mm Hg

2. What is the vapor pressure of B at 35 °C 2. ______ 75 mm Hg

3. At what temperature is the vapor pressure of A 800 mm?` 3. ______ 75 °C

4. What is the vapor pressure of B at this temperature? 4. ______ 225 mm Hg

5. At what temperature is the vapor pressure of A equal to your 5. ______ 45 °C answer to Questions 4?

6. What is meant of “normal boiling point? 6. ______the temperature

______at which a liquid evaporates when the external pressure is 1 atmosphere

7. What is the normal boiling point of A? 7. ______ 74 °C

8 What is the normal boiling point of B? 8. ______ 118 °C

9. At what temperature would A boil if atmospheric pressure 9. ______ 73 °C were 700 mm?

10. What would the atmospheric pressure have to be in order for B to 10. ______ 225 mm Hg boil at the temperature you gave as your answer to Question 9?

CHCl3 CCl4 H2O A and B are temperatures; 101.325 kPa The others are points on the graph 100 G

80 E F B Gas

60 Liquid Gas C D A 40 Liquid Solid Liquid

Vapor(kPa) Pressure 20 Solid Temperature Energy 0 20 40 60 80 100 Figure 2 Temperature (°C) Figure 1

Use Figure 1 to answer the following questions.

1. What will the boiling point of CHCl3 be when the atmospheric 1. ______ 60 °C pressure exerted on its surface is 101.325 kPa?

2. What is the normal boiling point for CCl4? 2. ______ 75 °C

3. What is the pressure when water boils at 70 °C? 3. ______ 35 kPa

4. Which liquid on the graph has molecules that exert the strongest 4. ______H2O attractive forces with each other?

5. Does increasing the temperature of a liquid cause its vapor pressure 5. ______increase to increase or decrease?

6. Which of the liquids in Figure 1 would be easiest to evaporate? 6. ______CHCl3

Use Figure 2 to answer the following questions.

7. Identify the point of the graph where each of the following occurs.

______C a. melting begins ______E c. boiling begins

______D b. freezing begins ______F d. condensation begins

8. Does the substance give off or take in heat as it goes from D to C? 8. ______gives off energy