MATLS 1M03 - WebCT - Assignment 2 - Try 3

# MATLS 1M03 - WebCT - Assignment 2 - Try 3 - WebCT Quiz...

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student. .. 1 of 4 2/5/2007 3:07 PM View Results Name: AARON MURENBEELD Attempt: 3 / 3 Out of: 16 Started: February 3, 2007 11:49pm Finished: February 4, 2007 4:32am Time spent: 4 hr, 43 min., 10 sec. Question 1 (1 point) What is the maximum purity (in at%) that can be practically achieved in metals? Student response: Correct Response Student Response Answer Choices a. 72% b. 88% c. 97% d. 99.1% e. 99.9999% General feedback: See page 68 of the text book for more details. Score: 1 / 1 Question 2 (1 point) True or False: A metal is more likely to dissolve in a host metal that has a lower valency. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: Other factors being equal, a metal will have more of a tendency to dissolve another metal of higher valency than one of a lower valency. ~ from page 69 of the text. Score: 1 / 1 Question 3 (1 point) Calculate the fraction of atom sites that are vacant for silver at 817°C. Assume an energy for vacancy formation of 0.674 eV/atom. Use scientific notation, significant figures in answer: 3 Student response: 7.58e-4 Correct answer: 7.67E-4 (7.67 * 10 -4 ) General feedback: The ratio is the number of vacancies ( N v ) over the number of atomic sites ( N ). For more information, see pages 66-67 of the text. Score: 1 / 1 Question 4 (1 point) Find the composition in atom percent (at%) of the copper in an aluminum-copper alloy that consists of 53.46 wt% aluminum. Use decimal notation, digits after decimal: 2 Student response: 27.00 at% Correct answer: 26.99 at%

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student. .. 2 of 4 2/5/2007 3:07 PM General feedback: For help on composition conversions, please see page 71 of the textbook. An example similar to this question is given on page 73. Score:
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## This note was uploaded on 02/08/2010 for the course MATLS 1M03 taught by Professor Okon during the Winter '09 term at McMaster University.

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MATLS 1M03 - WebCT - Assignment 2 - Try 3 - WebCT Quiz...

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