Victory for the ACT Student Text 15e

L ESSON 1 | D ATA R EPRESENTATION • 305 According to the information provided, both water and carbon dioxide exist solely as liquids at which of the following pressure and temperature combinations? A. 10°C and 56 atm. B. 0°C and 1 atm. C. 30°C and 10 atm. D. There is no point at which both water and carbon dioxide exist solely as liquids. 39. In Figure 1, the line indicating equilibrium between solid water (ice) and liquid water has a negative slope. This indicates that to maintain equilibrium between the two states: A. as the temperature is decreased, the pressure must be decreased. B. as the temperature is increased, the pressure must be decreased. C. as the temperature is increased, the pressure must remain constant. D. as the temperature is increased, the pressure must be increased, then decreased. 40. Sublimation occurs when a solid changes to a gas without going through a liquid phase. Under which of the following conditions can sublimation occur? F. Water at 0 q C and 0.80 atm. G. Water at 80 q C and 0.006 atm. H. Carbon dioxide at 78.5 q C and 1 atm. J. Carbon dioxide at 0 q C and 5.11 atm. 38.

According to the information provided and Figure 1, water becomes a •—’‡”…”‹–‹…ƒŽ ϐŽ—‹† ™Š‡ –Š‡ –‡’‡”ƒ–—”‡ and pressure exceed: F. 0.006°C and 0.01 atm. G. 0.01°C and 0.006 atm. H. 218°C and 374 atm. J. 374°C and 218 atm. At 100°C, as pressure is decreased from 1.5 atm to 0.006 atm, which of the following is true? A. Carbon dioxide changes from a gas to a liquid. B. Carbon dioxide changes from a liquid to a gas. C. Water changes from a liquid to a gas. D. Water changes from a gas to a liquid. Based on the information provided and the phase diagram for carbon dioxide, it can be inferred that the triple point of carbon dioxide occurs at: F. 78.5°C and 1 atm. G. 56.4°C and 5.11 atm. H. 0.01°C and 0.006 atm. J. 31.1°C and 73 atm.

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