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q3w.key - Dr Zellmer Time 18 mins Name 1 KEY Chemistry 122...

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Dr. Zellmer Chemistry 122 Wednesday 10:30 AM Time: 18 mins Summer Quarter 2008 July 9, 2008 Quiz III Name KEY Rec. Instr. 1. (10 pts) Draw a phase diagram for a substance with the properties listed below (Letters A-D). Label the regions ( phases ) AND and the points A-D on the diagram. Then explain what the points A-D represent (next to the letters listed below). For letter E answer the question given and give a brief explanation. A. Vapor pressure: 0.1 atm at -20°C: Sublimation point or P & T at which solid and gas are in equilibrium. Line AB is the vapor pressure curve for the solid. Every point on this line represents an equilibrium between solid and gas (a sublimation point). B. Triple point: 10°C at 0.5 atm - 3 phases in equilibrium In this case, all 3 states (solid, liquid and gas) exist in equilibrium (at the same time). C. Normal melting point: 30°C - m.p. at 1 atm The temperature at which the solid and liquid are in equilibrium at 1 atm Line BC is the m.p. curve - each point on this line is a m.p. at a particular atmospheric pressure.
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