Chem 107 Exam 3

Chem 107 Exam 3 - CHEM 107 Fall 2007 Dr. M. P. Soriaga...

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CHEM 107 Fall 2007 Dr. M. P. Soriaga Sample Exam Questions (Chapters 8 – 12)
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Assume that metallic Co (atomic radius of 0.125 nm) can exist in both simple and face- centered cubic crystal lattices. (i) Draw the arrangement of the Co atoms on one of the faces of the simple cubic unit cell. (ii) Calculate the dimensions of the simple cube. (iii)i Draw the arrangement of the Co atoms on one of the faces of the face-centered cubic unit cell. (iv) Calculate the dimensions of the face-centered cube. (v) Calculate the density, in g cm -3 , of Co that crystallizes in the simple cubic unit cell. (v) Calculate the density, in g cm -3 , of Co that crystallizes in the face-centered cubic unit cell. Explain why the boiling point of F-CH 3 (-78.2°C) is much higher than that of CF 4 (-127.8°C) even if it has a lower molecular weight. Consider the following molecules: CH 4 , CH 3 I, CI 4 , HI and KI. Arrange these in the order of increasing boiling points. Justify your answer. Describe the band theory of solids and differentiate by way of energy-level diagrams insulators, intrinsic semiconductors, p -doped semiconductors, n -doped semiconductors and metallic conductors.
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True or false. If false, rewrite the statement so that it becomes true; simple insertion of the adverb “not” to negate a false statement will be insufficient. (a) The integrated rate law gives the relationship between the rate and the activation energy. (b) The stored grain in a silo burns slowly but the grain "dust" is explosive. This is because the walls of the silo act as a catalyst for the combustion of the powdered grain. (c).
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Chem 107 Exam 3 - CHEM 107 Fall 2007 Dr. M. P. Soriaga...

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