MTLS 1M03 Assignment 2 Attempt5

MTLS 1M03 Assignment 2 Attempt5 - Learning System Quiz...

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View Results Name: SIAMAK KIANI Attempt: 3 / 3 Out of: 18 Started: February 3, 2009 12:51am Finished: February 3, 2009 4:21am Time spent: 3 hr, 29 min., 46 sec. Question 1 (1 point) True or false? In metals, there are significantly more vacancies than self-interstitials. Student response: Percent Value Correct Response Student Response Answer Choices 100.0% a. True 0.0% b. False General feedback: True . In metals, there are significantly more vacancies than self-interstitials. Score: 1 / 1 Question 2 (1 point) True or false? The solute is an element or compound present in the greatest amount. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . The solute is the element or compound present in a minor concentration. The solvent is the element or compound present in the greatest amount. Score: 0 / 1 Question 3 (1 point) How many vacancies are present in a cubic meter of a material with the following properties at 813°C? The energy for vacancy formation is 1.05 eV/atom. The density of the material is 14.6 g/cm 3 . The atomic weight of the material is 189 g/mol. Use scientific notation, significant figures in answer: 3 Student response: 6.26e23 Correct answer: 6.26E23 (6.26 * 10 23 ) General feedback: See page 67-68 of the text book for a similar example. Score: 1 / 1 Question 4 (1 point) For a Cu-Zn alloy that constains 36.71 at% Cu, what is the concentration of Zn (in wt%)? The atomic weights for Zn and Cu are 65.39 and 63.55 g/mol, respectively. Use decimal notation, digits after decimal: 2 Student response: 63.95 wt% Correct answer: 63.95 wt% Learning System Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_09/scripts/student/. .. 1 of 4 2/3/2009 4:27 AM
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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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MTLS 1M03 Assignment 2 Attempt5 - Learning System Quiz...

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