A phase diagram shows the temperatures and pressures at which a chemical substanceexists in a certain phase (solid, liquid, or gas). A sample phase diagram for a fictionalsubstance is shown in the figure, where T is temperature in Kelvin and P is pressure in atmospheres. Where on the diagram a certain temperature and pressurecombination falls determines the state(s) in which the substance exists. For example,if a certain temperature-pressure pairing falls in the gas area (but not on the linesegment between gas and liquid), the substance exists only as a gas. However, if thetemperature-pressure pairing is on the line segment between gas and liquid, the substanceexists as both a gas and a liquid. Assuming T > 0 and P > 0, which of the following systems of inequalities could be used to describe thetemperature and pressure ranges in which this substance exists only as a liquid?
A.
B.
C.
D.
Answer:A
A phase diagram shows the temperatures and pressures at which a chemical substanceexists in a certain phase (solid, liquid, or gas). A sample phase diagram for a fictionalsubstance is shown in the figure, where T is temperature in Kelvin and P is pressure in atmospheres. Where on the diagram a certain temperature and pressurecombination falls determines the state(s) in which the substance exists. For example,if a certain temperature-pressure pairing falls in the gas area (but not on the linesegment between gas and liquid), the substance exists only as a gas. However, if thetemperature-pressure pairing is on the line segment between gas and liquid, the substanceexists as both a gas and a liquid. Assuming T > 0 and P > 0, which of the following systems of inequalities could be used to describe thetemperature and pressure ranges in which this substance exists only as a liquid?
A. B. C. D.
Explanation: A