Multiple Choice
Which of the following is typically required to cause a substance to change phases (for example, from solid to liquid or liquid to gas)?
58
views
13. Liquids, Solids & Intermolecular Forces
Phase Diagrams
Multiple Choice
In a phase diagram for CO_2, which point represents the critical point?
A
The point where all three phase boundaries intersect
B
The point where the liquid-gas boundary ends at high temperature and pressure
C
The point at the lowest temperature and pressure on the diagram
D
The point where the solid-liquid boundary meets the triple point
Verified step by step guidance1
Understand that a phase diagram shows the states of matter (solid, liquid, gas) of a substance at different temperatures and pressures.
Identify the triple point on the diagram, which is where all three phase boundaries (solid-liquid, liquid-gas, and solid-gas) intersect, representing equilibrium of all three phases.
Recognize that the critical point is distinct from the triple point; it is located at the end of the liquid-gas boundary line at high temperature and pressure.
Know that beyond the critical point, the liquid and gas phases become indistinguishable, forming a supercritical fluid.
Therefore, the critical point corresponds to the termination of the liquid-gas phase boundary at high temperature and pressure on the phase diagram.
Related Videos
Related Practice
