Practice: The critical point of this substance occurs at what temperature?
Phase Diagrams show what effect temperature and pressure have on a pure substance in a closed system without any air.
Phase Diagrams
Concept #1: States of Matter of Phase Diagrams
Example #1: At a temperature of 60ºC and 1.20 atm determine the physical state of the substance from the phase diagram shown above?
Concept #2: Phase Changes of Phase Diagrams
Example #2: A substance has a triple point -45.0 ºC and 500 mmHg. What is the most likely phase change to occur for a solid sample of this substance as it is heated from -60.0 ºC to 10 ºC at a pressure of 490 mmHg?
Practice: Arrow I corresponds to:
Practice: What is the normal freezing point of this unknown substance?
Practice: At what temperature can we no longer tell the difference between the liquid and gas phases?
