1M03 2009 ASSIGNMENT 2-3 ¿¯

1M03 2009 ASSIGNMENT 2-3...

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View Results Name: SOO NAM Attempt: 3 / 3 Out of: 18 Started: February 3, 2009 12:54am Finished: February 3, 2009 2:12am Time spent: 1 hr, 17 min., 43 sec. Question 1 (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 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: 1 / 1 Question 3 (1 point) The number of vacancies in some hypothetical metal increases by a factor of 4 when the temperature is increased from 907 K to 1013 K. Calculate the energy for vacancy formation (in eV/atom) assuming that the density of the metal remains the same over this temperature range. Use decimal notation, digits after decimal: 3 Student response: 1.036 eV/atom Correct answer: 1.036 eV/atom General feedback: For more information, see the section on Vacancies and Self-Interstitials in the text.
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Score: 1 / 1 Question 4 (1 point) Find the composition in weight percent (wt%) of the copper in an aluminum-copper alloy that consists of 19.63 at% aluminum. Use decimal notation, digits after decimal: 2 Student response: 90.60 wt% Correct answer: 90.60 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 2-3...

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