The phase diagram of a substance is given above. This substance is a at 25°C and 1.0 atm.
A) supercritical fluid
B) gas
C) liquid
D) crystal
E) solid

Question

Quizplus · Accepted Answer

At 25°C and 1.0 atm, the substance is within the liquid region of the phase diagram, so the best choice is C. It is not a gas because it is not above the boiling point at this pressure, and it is not a solid because it is not below the melting point at this pressure. It is also not a supercritical fluid because it is not above the critical temperature and pressure.

The Phase Diagram of a Substance Is Given Above