Phase Diagrams and Conductivity

Phase Diagrams Name ______

A phase diagram is a graph that illustrates how the phases of a particular substance are affected by changes in temperature and pressure. This graph is constructed by combining the vapor pressure-temperature curves for the solid and liquid phases of the substance. At any point not on a line in a phase diagram, only a single phase exists. At any point on a line, the two phases bordering that line are in equilibrium. This means that both phases exist at the same time. At the triple point, the point where the three lines intersect, the three phases are in equilibrium. In other words, all three phases are present at the same time. Refer to the diagram to the right to answer the following questions. This diagram is a phase diagram of the element Xenon.

1. What phase(s) of xenon is (are) present for the temperature-pressure readings in each of the following regions of the phase diagram? a. directly above AB ______b. on curve BC ______

c. on line AB ______d. on curve BD ______

e. directly below line AB ______f. at point B ______

2. Given a sample of xenon at any point on curve BD, what effect would each of the following changes have on the sample? a. increasing pressure while holding temperature constant. ______

b. increasing temperature while holding pressure constant. ______

3. Given a sample of xenon at any point on curve AB, what effect would each of the following changes have on the sample? a. decreasing pressure while holding temperature constant. ______

b. decreasing temperature while holding pressure constant. ______

4. Given a sample of xenon at any point on curve BC, how could more liquid xenon in the sample be made to solidify without changing the temperature?

______

5. Give the value for each of the following for xenon.

a. triple point temperature ______b. normal melting point ______

c. triple point pressure ______d. normal boiling point ______

6. Using the diagram on page 409 of your textbook and estimate the triple point temperature and pressure of water.

triple point temperature = ______triple point pressure = ______

7. Using the diagram on page 409 of your textbook and estimate the triple point temperature and pressure of CO2.

triple point temperature = ______triple point pressure = ______