CH 301 HW 10 Soltn - Wright, Jacqueline – Homework 10 –...

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Unformatted text preview: Wright, Jacqueline – Homework 10 – Due: Apr 16 2007, 11:00 pm – Inst: Sara Sutcliffe 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Question 1-6 are for Chapter 5; the others are from Chapter 6. We will cover up to Chapter 5 on Exam 3 and save CH6 for Exam 4. UNIT CONVERSION NOTE: 1 atm = 1.01325 bar HINT FOR Q 12: Keep in mind that if the internal energy of a system increases, then its temperature will increase, and vice versa. You can use this and your knowledge of CH4 to figure out the answer. 001 (part 1 of 1) 10 points Which would you expect to be least viscous? 1. C 8 H 18 at 50 ◦ C 2. C 4 H 8 at 50 ◦ C correct 3. C 8 H 18 at 30 ◦ C 4. C 4 H 8 at 30 ◦ C Explanation: 002 (part 1 of 1) 10 points A unit cell of one of the new high- temperature superconductors is shown here. Y (at outside corners of the cell) Ba (at inside corners of smaller cubes) O (at face centers of smaller cubes) Cu (at centers of smaller cubes). All atoms are on the surface of the unit cell except for the copper atoms and two of the oxygen atoms. What is its empirical formula? 1. YBa 7 Cu 2 O 3 2. YBa 7 Cu 4 O 2 3. Y 2 Ba 2 Cu 3 O 3 4. Y 2 Ba 2 CuO 3 5. Y 3 Ba 3 Cu 2 O 2 6. YBa 2 Cu 3 O 7 correct 7. Y 8 Ba 8 Cu 3 O 12 8. Y 3 Ba 2 Cu 3 O 2 9. YBa 2 Cu 4 O 7 10. YBa 3 Cu 2 O 7 Explanation: Eight yttrium atoms lie on the corners, eight barium atoms lie on the edges, eight oxygen atoms lie on the faces and three cop- per atoms and two oxygen atoms lie inside the unit cell....
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This note was uploaded on 12/08/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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CH 301 HW 10 Soltn - Wright, Jacqueline – Homework 10 –...

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