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e04mtm - Engineering 45 The Structure and Properties of...

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Page 1 Engineering 45 The Structure and Properties of Materials Midterm Exam March 17, 2004 Problem 1: (a) The following materials are good electrical insulators: diamond (DC structure), MgO (NaCl structure), and polyethylene (amorphous structure). In each case, explain why you would expect this. (b) The following materials are excellent conductors: Al, Cu and Na (if you can keep it from oxidizing). What property do they have in common that would cause you to expect this? (c) If I asked you whether Fe or Zn would feel colder to the touch, the values of which material property would you look up? If you could not find this property anywhere, what other property could you use instead?
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Engineering 45: Spring, 2004 Midterm Exam Page 2 Problem 2: The Second Law of Thermodynamics states that the entropy of an isolated system can only increase. The change in entropy in an infinitesimal change of state is dS = 1 T dE + PdV - k µ k dN k 2.1
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