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q1t.125

# q1t.125 - Dr Zellmer Time 30 mins Chemistry 125 Winter...

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Dr. Zellmer Chemistry 125 Tuesday Time: 30 mins Winter Quarter 2012 January 24, 2012 Quiz I Name Rec. TA/time ---------------------------------------------------------------------------------------------------------------------------------------- Show ALL your work or EXPLAIN to receive full credit. R = 0.08206 L C atm/mol C K = 8.314 J/mol C K 1. (6 pts) Consider a steel tank with a volume of 68.00 L that can withstand a pressure of 2295 lb/in 2 . A sample of O 2 gas has a volume of 9841 L at STP. If the O 2 gas is put in the steel tank at 33.0°C will the tank explode? (1 atm = 760 mmHg = 760 torr = 101.325 kPa = 14.7 lb/in 2 ) 2. (5 pts) You have both He and Ar at 500°C. Explain (no calculations necessary) using Kinetic Molecular Theory and the equations for the root-mean-square (rms) speed, u, and average kinetic energy, how the rms speeds and average kinetic energies compare. (At. Wts.: He = 4.00, Ar =39.95) Copyright R. J. Zellmer, January 24, 2012 OVER ...

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3. (10 pts) Draw a phase diagram for a substance for which the solid is more dense than the liquid and has the properties listed below (Letters A-D ). Label the regions ( phases ) AND the points A-D on the diagram. Then explain what the points A-D represent (next to the letters listed below).
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