CHEM 1AA3 Lecture Notes - Lecture 8: Vapor Pressure, Intermolecular Force, Surface Tension

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1AA3
• Professor: David Brock

Document Summary

22: as dry ice (solid co2) heats up it doenst melt. As it starts subliming, it creates a pocket of gas inbetween it and the warm surface. Above critical point can get a supercritical fluid. When you do that you can go from vapour to a higher temp past critical temp, increase pressure, decrese temp, decrease pressue. Then will go from vapour to liquid without ever crossing a phase boundry. If you go beyond the temp and pressure gonna get supercritical fliid. As he was increase the temp, he was increasing the temp and pressure. Theres one phase where it as all density. The density of the liwuid decreases while the density of the gas increases until they are the same. As temp increase, vapour pressure increase since more molecules go into gas phase. Water has stronger intermolecular forces so wants to stay as liquid longer.