1M03 2009 ASSIGNMENT 2-2 ¿¯

1M03 2009 ASSIGNMENT 2-2...

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View Results Name: SOO NAM Attempt: 2 / 3 Out of: 18 Started: February 2, 2009 9:36pm Finished: February 3, 2009 12:50am Time spent: 3 hr, 13 min., 58 sec. Question 1 (1 point) True or False: Crystals are never perfect at the atomic level. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: True. Crystals all contain a large number of defects. Score: 1 / 1 Question 2 (1 point) Which of the following characteristics that relate to solutes and solvents (and their atoms) determine the degree to which the solute species dissolves in the solvent? Student response: Correct Response Student Response Answer Choices a. Atomic number b. Valence c. Atomic size d. Electronegativity value e. Crystal structure f. All of the above g. B, C, D, and E h. A, B, C, and D General feedback: The four features of the solute and solvent atoms that determine the degree to which the former dissolves in the latter are: Valence Atomic size Electronegativity value Crystal structure See page 69 of the text for more information. Score: 1 / 1 Question 3 (1 point) Calculate the energy for vacancy formation (in eV/atom) in a metal given that the equilibrium number of vacancies at 540°C is 2.86x10 24 per m 3 . The density and atomic weight for this metal are 10.9 g/cm 3 and 172 g/mol, respectively. Use decimal notation, digits after decimal: 3 Student response: eV/atom Correct answer: 0.666 eV/atom General feedback: See pages 67-68 of the text for a similar example. Score: 0 / 1
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Question 4 (1 point) For a Cu-Zn alloy that constains 20.12 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: 80.33 wt% Correct answer: 80.33 wt% 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 04/04/2011 for the course MATLS 1M03 taught by Professor Okon during the Spring '09 term at McMaster University.

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1M03 2009 ASSIGNMENT 2-2...

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