MSE350-exam1-5oct07b-all

# MSE350-exam1-5oct07b-all - Name ID Number MSE 350 Exam I(b...

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Name:_________________________ ID Number:___________________ 1 MSE 350 Exam I – 10/05/07(b) You may use a page of notes, a periodic table, & a calculator for this exam Good Luck! This exam is taking place under the College of Engineering Honor Code. In order to obtain credit for this exam, you are required to write the Honor Pledge and your signature below: Honor Pledge: _____ Signature: Page 2 /20 Page 3 /16 Page 4 /12 Page 5 /12 Page 6 /20 Page 7 /20 TOTAL /100 h=6.6261x 10 -34 J-s m e =9.11 x 10 -31 kg

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Name:_________________________ ID Number:___________________ 2 True/False: Answer the following questions T rue or F alse (2 points each): 1._____ The cohesive energy is the energy which enables a liquid to freeze. 2._____ A BCC lattice has a lower packing fraction than an FCC lattice 3._____ The kinetic energy associated with a delocalized electron helps hold together a metallic solid. 4._____ The cohesive energy of a pair of ions is usually larger than the the cohesive energy of a 3D ionic solid containing the same atoms. 5._____ A face-centered cubic (FCC) lattice has ABC stacking of its closest-packed planes, while a hexagonal close-packed (HCP) lattice has AB stacking of its closest-packed planes. Fill in the Blanks: 6. Fill in the blanks in the following calculation of the cohesive energy of an ionic solid (1 point each, 8 points total) [Note: #s are not needed here]: 7. Considering your answer in #6, write out an expression for the Cohesive Energy, U cohesive , of an ionic solid (2 points): Be Gas + Be + Gas + + + O - Gas O Gas Be +2 + Gas Cl - Gas O -2 Solid O -2 + + + Be Gas + O Gas Solid + + O -2 Be +2 Be +2 Gas + Be +2 Gas + Be + + + O -2 Gas Gas O - + +
Name:_________________________ ID Number:___________________ 3 Short Answer: 8. Define the Cohesive Energy of a Solid (3 points): 9. Considering the terms in the cohesive energy for ionic, covalent, and metallic bonding, explain why Group IVB elements and Group A transition elements tend to have a significant component of covalent bonding. [Hint: Compare the values of the energy terms on your periodic table] (3 points): 10. A few years ago, Prof. Hales, from the Mathematics Department here at the University of Michigan, found the answer to a problem which mathematicians have been struggling to solve for nearly 400 years. The

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