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Assignment 2 - WebCT Quiz...

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WebCT Quiz http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_06_newRestore/s... 1 of 2 02/02/2006 4:51 PM Assignment 2 (Ch 4 & 5) Name: BRYCE JONES Start time: January 29, 2006 2:33pm Number of questions: 10 Finish Help Question 1 (1 point) _________________ point defects occur when impurity atoms fill the voids or interstices between host atoms in the crystal structure. Answer: Save answer Question 2 (2 points) How many vacancies are present in a cubic meter of a material with the following properties at 556°C? The energy for vacancy formation is 1.41 eV/atom. The density of the material is 13.1 g/cm 3 . The atomic weight of the material is 174 g/mol. Use scientific notation, significant figures in answer: 3 Answer: Save answer Question 3 (1 point) Find the composition in weight percent (wt%) of the copper in an aluminum-copper alloy that consists of 74.52 at% aluminum. Use decimal notation, digits after decimal: 2 Answer: Units: Save answer Question 4 (2 points) Consider a copper-aluminum solid solution containing 89.3 at% Al. How many atoms per cubic centimeter (atoms/cm^3) of
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