Name: ___________________________________________________ Date: _______________________________ Period: ________
PHASE DIAGRAMS WORKSHEET
NOTE: “Normal” refers 1 atm = 101.3 kpa = 760 mmHg
Part A – Generic Phase Diagram.
Answer questions 1 – 10 in relation to the following generic phase diagram.
1. Which section represents the solid phase? ___________
2. What section represents the liquid phase? __________
3. What section represents the gas phase? ____________
4. What letter represents the triple point? ____________
In your own words, what is the definition of a triple point?
_______________________________________________
5. What is this substance’s normal melting point, at 1
atmosphere of pressure? __________________________
6. What is this substance’s normal boiling point, at 1
atmosphere of pressure? ___________________________
7. Above what temperature is it impossible to liquefy this substance, no matter what the pressure? __________________
8. At what temperature and pressure do all three phases coexist? ____________________________________________
9. At a constant temperature, what would you do to cause this substance to change from the liquid phase to the solid
phase? ________________________________________________________________________________________
10. What does sublimation mean? _____________________________________________________________________
Part B – Phase Diagram for Water.
11.
12.
13.
At a pressure of 1 atmosphere, what is the normal
freezing point of water? _____________________
What is the normal boiling point of water, at one
atmosphere of water? ______________________
People in Albuquerque live approximately 5,500
feet above sea level, which means the normal
atmospheric pressure is less than 1 atm. In
Albuquerque, will water freeze at a lower
temperature or a higher temperature than at 1
atmosphere? __________________ Will water
boil at a higher or lower temperature, than at 1
atmosphere? ___________________
Part C – Phase Diagram for Carbon Dioxide.
14.
15.
At 1 atmosphere and room temperature (25C), would
you expect solid carbon dioxide to melt to the liquid
phase, or sublime to the gas phase? ______________
Some industrial processes require carbon dioxide.
The carbon dioxide is stored on-site in large tanks as
liquid carbon dioxide. Assuming we lived at sea level
(1 atm), how could carbon dioxide be liquefied?
_________________________________
Part D - Refer to the phase diagram below when answering the questions:
15. What is the normal freezing point of this substance? ________
16. What is the normal boiling point of this substance? ________
17. What is the normal melting point of this substance? ________
18. What is the phase (s, l, g) of a substance at 2.0 atm and 100 °C? _________
19. What is the phase (s, l, g) of a substance at 0.75 atm and 100 °C? _________
20. What is the phase (s, l, g) of a substance at 0.5 atm and 100 °C? _________
21. What is the phase (s, l, g) of a substance at 1.5 atm and 50 °C? _________
22. What is the phase (s, l, g) of a substance at 1.5 atm and 200 °C? _________
23. What is the phase (s, l, g) of a substance at 1.5 atm and 800 °C? _________
24. What is the condition of the triple point of this substance? T= ________, P= _______
25. If a quantity of this substance was at an initial pressure of 1.25 atm and a temperature of 3000 C was lowered to a
pressure of 0.25 atm, what phase transition(s) would occur? ____________
26. If a quantity of this substance was at an initial pressure of 1.25 atm and a temperature of 00 C was lowered to a
pressure of 0.25 atm, what phase transition(s) would occur? ____________
27. If a quantity of this substance was at an initial pressure of 1.0 atm and a temperature of 2000 C was lowered to a
temperature of -2000 C, what phase transition(s) would occur? ____________
28. If a quantity of this substance was at an initial pressure of 0.5 atm and a temperature of 2000 C was lowered to a
temperature of -2000 C, what phase transition(s) would occur? ____________
29. Label the melting and freezing points on the graph.
30. Label the vaporization and condensation points on the graph.
31. Label the sublimation and deposition points on the graph.
32. Label the triple point on the graph.
33. Label the critical point on the graph.