This preview shows page 1. Sign up to view the full content.
Unformatted text preview: urther, the
gas and liquid densities to
become more similar.
properties of both
liquids and gases --- behaves as a gas, takes on
--the shape and size of the
--- has a density approaching
that of a liquid-incompressible!
“liquid solvents” The
The basic components of a supercritical
CO2 cleaning system. Critical
Supercritical fluid (SCF): a "non-compressible” and high
SCF has high thermal
motion, and it is
possible to change the
density widely (from low
like a gas to high like a
The greater the intermolecular force of a substance,
the more readily a gas is liquefied,
the higher the critical temperature Critical
Critical T and P http://www.chem.purdue.edu/gchelp/liquids/critical.html Phase
Phase diagrams: H2O vs. CO2
(a) P↑ mp↓
(unusual) H2O has normal
MP, no normal
sublimation point. (a) P↑ mp↑
W (b) TP at high P (b) TP at low P
CO2 has no normal
MP, only normal
sublimation point. 1. Which substance (s) cannot be liquefied at room temperature
Ar, N , O
2 2 4 2. Compare each pair of similar compounds above, which one has
higher critical temperature? How about critical pressure?
The higher polarity → the higher critical temperature as well
as the higher critical pressure!...
View Full Document
This document was uploaded on 02/26/2014.
- Fall '14