02 - Chem204 Lecture2 Letsconsiderthetransformationbetween

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Chem 204–Lecture 2 Let’s consider the transformation between phases for an element or a molecule. We know the most common phase transformations: fusion (s l), freezing (l s), vaporization (l g), condensation (g l). A couple of others: sublimation (s g), CO 2 (s); Ice (when T<0 ° C) deposition (g s), freezing fog (past weekend!).
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Lecture 2 –page 2 Phase transitions (s l), (l g) and (s g) have what common thermodynamic processes? Dew points (reported by our local weather reporters) signify the temperature at which water vapor saturates the air (100% humidity) Why can’t temperatures fall below the dew point? What happens physically? thermodynamically?
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Lecture 2 –page 3 We use phase diagrams to relate the temperatures and pressures at which different phases co-exist (i. e. where Δ G α↔β =0). cartage.org.lb Generic Diagram
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Lecture 2 –page 4 Let’s take a closer look: library.thinkquest.org
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This note was uploaded on 11/19/2010 for the course CHEM 204 taught by Professor Gruebele during the Spring '08 term at University of Illinois, Urbana Champaign.

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02 - Chem204 Lecture2 Letsconsiderthetransformationbetween

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