MASC 310 Sample MT

MASC 310 Sample MT - SAMPLE MIDTERM (With solutions) Closed...

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1 SAMPLE MIDTERM (With solutions) Closed book, closed notes Scientific calculators allowed
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2 1. Atomic bonding. a. Explain why it is difficult to find a material that has both a high stiffness and a high coefficient of thermal expansion. Stiffness is related to the curvature (or second derivative) of the bond energy curve at its minimum, while CTE is related to the asymmetry of the curve. Bond energy curves that are sharply curved have large 2 nd derivatives and high stiffness. However, such curves are also relatively symmetric, so they will exhibit LOW CTEs. A stiff material with a high CTE requires both a sharp (tight) curvature of the bond energy curve, and an asymmetric shape. This is difficult to achieve. b. For each of the primary bond types, answer the following questions i. Does this type of primary bond usually involve electronegative atoms, electropositive atoms, or both types? ii.
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MASC 310 Sample MT - SAMPLE MIDTERM (With solutions) Closed...

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