When the phase diagram for a substance has a solid- liquid phase boundary line that has a negative slope (leans to the left), the substance .
A) can go from solid to liquid, within a small temperature range, via the application of pressure
B) cannot be liquefied above its triple point
C) sublimes rather than melts under ordinary conditions
D) cannot go from solid to liquid by application of pressure at any temperature
E) melts rather than sublimes under ordinary conditions

Question

Quizplus · Accepted Answer

When the solid-liquid phase boundary has a negative slope, it means that increasing pressure can cause the solid to melt into a liquid, which is characteristic of substances like water.

When the Phase Diagram for a Substance Has a Solid-