q3w.122 - solid or liquid OVER 2(8 pts Copper metal with an...

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Dr. Zellmer Chemistry 122 Wednesday 10:30 AM Time: 18 mins Summer Quarter 2008 July 9, 2008 Quiz III Name Rec. Instr. ---------------------------------------------------------------------------------------------------------------------------------------- Show ALL your work to receive full credit. R = 0.08206 L C atm/mol C K = 8.314 J/mol C K 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 B. Triple point: 10°C at 0.5 atm C. Normal melting point: 30°C D. Critical point: 150°C at 25 atm (Don’t worry about proper scale for this point.) E. Which phase is MORE dense (circle answer and explain)?
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Unformatted text preview: solid or liquid OVER . .. 2. (8 pts) Copper metal, with an atomic radius of 1.347 Å, crystallizes in a face-centered-cubic unit cell. (At. wt.: Cu = 63.55) (1 Å = 1 x 10-8 cm, N A = 6.02 x 10 23 ) (a) Determine the density of copper metal (in g/cm 3 ). (b) What is the coordination number of Cu in this structure? 3. (4 pts) Answer the following questions about NaCl. (a ) Describe the NaCl unit cell (i.e. Where are the cations and anions located in the unit cell and how many NaCl formula units are there in the unit cell?). (b) What is the number of nearest neighbors (coordination number) of Cl ! in this structure and what ions are its nearest neighbors? 4. (3 pts) Calculate the mass percentage of a solution of 25.5 g of phenol (C 6 H 5 OH) in 495 g of ethanol (CH 3 CH 2 OH)....
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q3w.122 - solid or liquid OVER 2(8 pts Copper metal with an...

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