Elemental carbon has one gas phase, one liquid phase, and two different solid phases, as shown in the phase diagram: (a) On the phase diagram, label the gas and liquid regions. (b) Graphite is the most stable phase of carbon at normal conditions. On the phase diagram, label the graphite phase. (c) If graphite at normal conditions is heated to 2500 K while the pressure is increased to 10 10 Pa, it is converted into diamond. Label the diamond phase. (d) Circle each triple point on the phase diagram. (e) In what phase does carbon exist at 5000 K and 10 8 Pa? (f) If the temperature of a sample of carbon increases from 3000 K to 5000 K at a constant pressure of 10 6 Pa, which phase transition occurs, if any?
Elemental carbon has one gas phase, one liquid phase, and two different solid phases, as shown in the phase diagram: (a) On the phase diagram, label the gas and liquid regions. (b) Graphite is the most stable phase of carbon at normal conditions. On the phase diagram, label the graphite phase. (c) If graphite at normal conditions is heated to 2500 K while the pressure is increased to 10 10 Pa, it is converted into diamond. Label the diamond phase. (d) Circle each triple point on the phase diagram. (e) In what phase does carbon exist at 5000 K and 10 8 Pa? (f) If the temperature of a sample of carbon increases from 3000 K to 5000 K at a constant pressure of 10 6 Pa, which phase transition occurs, if any?
Elemental carbon has one gas phase, one liquid phase, and two different solid phases, as shown in the phase diagram:
(a) On the phase diagram, label the gas and liquid regions.
(b) Graphite is the most stable phase of carbon at normal conditions. On the phase diagram, label the graphite phase.
(c) If graphite at normal conditions is heated to 2500 K while the pressure is increased to
10
10
Pa, it is converted into diamond. Label the diamond phase.
(d) Circle each triple point on the phase diagram.
(e) In what phase does carbon exist at 5000 K and
10
8
Pa?
(f) If the temperature of a sample of carbon increases from 3000 K to 5000 K at a constant pressure of
10
6
Pa, which phase transition occurs, if any?
Explain what happens as carbon at 2500° and atmospheric pressure is cooled to 1150° and the pressure is raised to 500 atm.
The figure below is the phase diagram of a purse substance. (I), (II) and (III) are the 3 phases of the substance, and there are 3 phase boundaries.
Based on this phase diagram, which of the following statement is (are) true about this substance?
a) Below 0.7 atm, the liquid phase of this substance can be formed by carefully adjusting temperature.
b) The substance can be transformed from liquid to solid by applying pressure.
c) The normal boiling point is between 190 K and 210 K.
Pressure
(in atm)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
(III)
0.7
0.6-
0.5-
120
140
160
180
200
220
T (in Kelvin)
O a) only
O b) only
O c) only
O a) and b)
O b) and c)
O c) and a)
O a), b) , and c)
O None of the 3 statements is true.
Use the phase diagram for methane, CH4, shown in Figure11.30 to answer the following questions. (a) What are theapproximate temperature and pressure of the critical point?(b) What are the approximate temperature and pressure ofthe triple point? (c) Is methane a solid, liquid, or gas at 1atm and 0 °C? (d) If solid methane at 1 atm is heated whilethe pressure is held constant, will it melt or sublime?(e) If methane at 1 atm and 0 °C is compressed until a phasechange occurs, in which state is the methane when thecompression is complete?
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