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1. A certain substance, X, has a triple-point temperature of 20 Â°C at a pressure of 2.0 atm. Which one of the statements a through d cannot possibly be true?
[A] X can exist as a solid above 20 Â°C.
[B] Liquid X can exist as a stable phase at 25 Â°C, 1 atm.
[C] X can exist as a liquid above 20 Â°C.
[D] Both liquid and solid X have the same vapor pressure at 20 Â°C.
[E] All of the statements a through d could be true.
2. The triple point of iodine is at 90 torr and 115 Â°C. This means that liquid I2
[A] Is more dense than I2(s).
[B] Cannot exist above 115 Â°C.
[C] Cannot exist at 1 atmosphere pressure.
[D] Can exist at pressure of 10 torr.
[E] cannot have a vapor pressure less than 90 torr.
3. The triple point of CO2 is at 5.2 atm and -57 Â°C. Under atmospheric conditions present in a typical Boulder, Colorado, laboratory (P = 630 torr,T = 23 Â°C), solid CO2 will:
[D] Remain solid.
[E] None of these
4. The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. A large increase in pressure will
[A] Raise the triple point.
[B] Lower the triple point.
[C] Lower the boiling point.
[D] Lower the freezing point.
[E] Raise the freezing point.
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