Exam 4 - Chem 1310 Exam 4 Professor Azizi Fall 2007 Name Date Please pencil in the correct answer on your scantron with a No.2 pencil Each question

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Chem 1310 Exam 4 Name:__________________________ Professor Azizi Fall 2007 Date: ___________________________ Please pencil in the correct answer on your scantron with a No.2 pencil. Each question is worth 4 points. No partial credit will be given. You will NOT be allowed to use a CRIB sheet. 1. Which of the following statements is (are) false? I. The hexagonal closest-packed structure is ABAB – – –. II. A body-centered cubic unit cell has four atoms per unit cell. III. For unit cells having the same edge length, a simple cubic structure would have a smaller density than a body-centered cube. IV. Atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structure was a simple cubic array. a) I b) II c) II, III d) I, IV e) II, III, IV 2. A liquid-liquid solution is called an ideal solution if I. it obeys PV = nRT . II. it obeys Raoult’s law. III. solute-solute, solvent-solvent, and solute-solvent interactions are very similar. IV. solute-solute, solvent-solvent, and solute-solvent interactions are quite different. a) I, II, III b) I, II, IV c) II, III d) II, IV e) I, II, III
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Chem 1310 Exam 4 Name:__________________________ Professor Azizi Fall 2007 Date: ___________________________ 3. The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution? density of ethanol = 0.80 g/cm3 density of water = 1.0 g/cm3 mol. wt. of ethanol = 46 g/mol a) 0.46 M b) 0.80 M c) 0.92 M d) 8.0 M e) 17 M 4. Using the following vapor pressure values at 25 ° C benzene (C 6 H 6 ) 94.4 torr chloroform (CHCl 3 ) 172.0 torr
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This note was uploaded on 05/07/2008 for the course CHEM 1310 taught by Professor Cox during the Fall '08 term at Georgia Institute of Technology.

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Exam 4 - Chem 1310 Exam 4 Professor Azizi Fall 2007 Name Date Please pencil in the correct answer on your scantron with a No.2 pencil Each question

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