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ch11_Part4 - GENERAL CHEMISTRY CHAPTER 11 INTERMOLECULAR...

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GENERAL CHEMISTRY CHAPTER 11 – INTERMOLECULAR FORCES, LIQUIDS, & SOLIDS P AGE 13 OF 22 Supercritical Fluid = A state of matter beyond the critical point that is neither liquid nor gas As a liquid is heated in a sealed container, more vapor collects causing the pressure inside the container to rise The density of the vapor to increases The density of the liquid to decreases At the T C & P C the meniscus between the liquid and vapor disappears and the states mix to form a supercritical fluid Have properties of both gas and liquid states Now consider the phase diagram for I 2 and CO 2 The fusion curve has a positive slope – as the temperature increases, pressure also increases Water has a negative slope Water is very ATYPICAL Most substances have positive slopes because increasing pressure favors the denser phase, which for most substances is solids Both water and iodine have stable, solid, liquid, and gas phases at 1 atm CO 2 has no stable liquid phase at 1 atm If we increase the temperature of a block of solid CO 2 (dry ice) at 1 atm, we cross the sublimation curve at – 78.5 o C
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