PE3a - CHM 111 Exam 3 Fall 2007 Name_ MULTIPLE CHOICE....

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CHM 111 Exam 3 Fall 2007 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question (60%). 1) What geometric arrangement of charge clouds is expected for an atom that has five charge clouds? A) tetrahedral B) square planar C) octahedral D) trigonal bipyramidal 1) 2) What are the bond angles in the following molecular model of SCl 4 ? A) some less than 90° and one less than 180° B) 90° and 180° C) some less than 90° one less than 120° but greater than 90°, and one less than 180° but greater than 120° D) 90°, 120°, and 180° 2) 3) The first law of thermodynamics A) defines entropy. B) is a statement of conservation of energy. C) provides a criterion for the spontaneity of a reaction. D) defines chemical energy. 3) 4) Which is the most acceptable electron dot structure for N 2 H 2 ? A) H ± N M N ± H B) H ± .. N M .. N± H C) H ± .. N = .. N± H D) H ± .. N .. ± .. N .. ± H 4) 5) Given: 4 NO 2 ( g ) + O 2 ( g ) ± 2 N 2 O 5 ( g ) ̇ H ° = - 110.2 kJ find ̇ H ° for N 2 O 5 ( g ) ± 2 NO 2 ( g ) + 1/2 O 2 ( g ). A) 55.1 kJ B) 220.4 kJ C) - 220.4 kJ D) - 55.1 kJ 5) 1
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6) What is the angle between adjacent sp 3 hybrid orbitals? A) 109.5° B) 120° C) 90° D) 180° 6) 7) What is the geometry around the central atom in the following molecular model of SO 3 2 - ? A) linear B) bent C) trigonal pyramidal D) tetrahedral 7) 8) Arrange the following in order of increasing ionic character: Al 2 S 3 , MgS, Na 2 S, P 4 S 3 , S 8 . A) Na
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This note was uploaded on 02/29/2012 for the course CHM 111 taught by Professor Colyer during the Summer '08 term at Wake Forest.

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PE3a - CHM 111 Exam 3 Fall 2007 Name_ MULTIPLE CHOICE....

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