Phase Diagram Review - Liberty Union High School District

Name: _________________ANSWER KEY____________________ Date: _______________________________ Period: ________
Part A – Generic Phase Diagram.
Answer questions 1 – 10 in relation to the following generic phase diagram.
1. Which section represents the solid phase? __A______
2. What section represents the liquid phase? ___C_____
3. What section represents the gas phase? ___B_______
4. What letter represents the triple point? ___d_______
In your own words, what is the definition of a triple point?
_answers will vary – s, l, g exist at equilibrium_________
5. What is this substance’s normal melting point, at 1
atmosphere of pressure? _____60°C_______________
6. What is this substance’s normal boiling point, at 1
atmosphere of pressure? _______100°C____________
7. Above what temperature is it impossible to liquefy this substance, no matter what the pressure? ____110°C______
8. At what temperature and pressure do all three phases coexist? __________0.5 atm, 45°C_____________________
9. At a constant temperature, what would you do to cause this substance to change from the liquid phase to the solid
phase? __________increase the pressure_____________________________________________________________
10. What does sublimation mean? ________to go from a solid to a gas directly________________________________
Part B – Phase Diagram for Water.
At a pressure of 1 atmosphere, what is the normal
freezing point of water? ______0°C_________
What is the normal boiling point of water, at one
atmosphere of water? ____100°C___________
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? ___higher________ Will water boil
at a higher or lower temperature, than at 1
atmosphere? _____lower________
Part C – Phase Diagram for Carbon Dioxide.
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? sublime to gas
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?
Increase the pressure
Part D – Phase Diagram for Tastegudum
On Crosbia, bolonium (Bg) and manasium (Ma) react together to form the compound tastegudum. For each of the
following questions (16-28), refer to the phase diagram for tastegudum.
See Miss Scott for answer key with labels
16. Label the regions of the diagram that correspond to the solid, liquid, and vapor phases. (Write the names of these
phases in the appropriate regions directly on the diagram.)
17. Draw a small red circle around the point that is the critical point for tastegudum.
18. Draw a small blue circle around the point that is the triple point for tastegudum.
19. What is the critical pressure, Tp, of tastegudum? ______90 atm_____________
20. What is the critical temperature, Tc, of tastegudum? ____750°C_____________
21. At what temperature and pressure will all three phases of tastegudum coexist at equilibrium?
T = ___250°C_____ P = ___35 atm_____
22. What is the boiling point temperature for tastegudum when the external pressure is 60 atmospheres? ___500°C__
23. What is the freezing point temperature for tastegudum when the external pressure is 60 atmospheres? __300°C___
24. If you were to have a container containing tastegudum in your kitchen, in what state (phase of matter) would you
expect to see it? Explain your answer.
Gas – because we live at 1.0 atm of pressure and room temperature is 25°C
25. A container of tastegudum is sitting at a pressure of 45 atmospheres and temperature of 100 °C. Describe what
will happen as the temperature is raised by 400 °C.
It will go through sublimation (solid to gas)
26. A container of tastegudum is sitting at a temperature of 300 °C under 1 atmosphere of pressure. Describe what
will happen as the pressure is increased to 90 atmospheres.
It will go from gas to solid (deposition)
27. Why can tastegudum not be brought to a boil at a temperature of 200 °C? Cannot exist as a liquid at that
temperature and boiling is liquid to gas.
28. Assuming it is not poisonous; could tastegudum be used as a drink on earth? Explain your answer. No, answers
with vary.