2010 Exam 2

2010 Exam 2 - Chemistry 241 Spring 2010 Exam 2 Name TA 1 2...

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Chemistry 241 Spring 2010 Exam 2 Name __________________________________ TA __________________________________ Section __________________ 1. You are responsible for all information on this page. 2. Show all work on the exam, and write answers in ink. Clearly indicate your answer and mark through any writing that should be ignored in grading. 3. There are four questions and a bonus. You should also have a Periodic Table. Potentially Useful Information cubic closest packing Radius Ratio Rules r + /r - (minimum) Lattice 0.22 ZnS 0.41 NaCl 0.73 CsCl 1 g = 6.022 x 10 23 amu 1 Å = 10 -8 cm 1 pm = 10 -12 m
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Problem 1. _____________/20 Problem 2. _____________/20 Problem 3. _____________/20 Problem 4. _____________/20 Bonus _____________/ 3 Total _____________/80
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1. (20 points) Cuprous bromide CuBr crystallizes in the zinc-blend lattice and has a density of 4.98 g/cm 3 . (Atomic masses: Cu 63.55 g/mole; Br 79.90 g/mole) A. Sketch the conventional unit cell of this lattice. See Useful Information for an exploded view of the anion packing. Use tetrahedral holes. B. Deduce the coordination number of Br - in the lattice. C. Estimate the shortest Cu + -Cu + distance in the lattice. Show your work. (If you cannot visualize the CuBr lattice, couch your answer in terms of the NaCl lattice for partial credit.) 3
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This note was uploaded on 03/20/2012 for the course CHM 24100 taught by Professor Professordavidr.mcmillin during the Spring '10 term at Purdue.

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2010 Exam 2 - Chemistry 241 Spring 2010 Exam 2 Name TA 1 2...

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