Chem 1 exam 4 fall 07 - Chemistry 1450 Exam 4 Fall 2007...

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Chemistry 1450, Exam 4 Fall 2007 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. The following ball-and-stick molecular model is a representation of the amino acid alanine (unshaded spheres = H). Only the connections between atoms are shown; multiple bonds and nonbonded electrons are not indicated. 1) What is geometry around the carbon atom labeled C 1 ? A) bent B) tetrahedral C) trigonal planar D) trigonal pyramidal 1) 2) What is the hybridization of the carbon atom labeled C 3 ? A) sp B) sp 2 C) sp 3 D) sp 3 d 2) 3) Use the given standard enthalpies of formation to calculate • H ° for the following reaction 3 Fe 2 O 3 ( s ) + CO( g ) • 2 Fe 3 O 4 ( s ) + CO 2 ( g ). Species H ° f , kJ/mol Fe 2 O 3 ( s ) -824.2 Fe 3 O 4 ( s ) -1118.4 CO ( g ) -110.5 CO 2 ( g ) -393.5 A) -5213.4 kJ B) +47.2 kJ C) -47.2 kJ D) -577.2 kJ 3) 4) The values of • H ° f for the three states of benzene are approximately -22 kcal/mol, -11 kcal/mol, and 20 kcal/mol. Which is the value for solid benzene? A) 20 kcal/mol B) -11 kcal/mol C) -22 kcal/mol D) cannot be determined without additional information 4) 1
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5) What is the bond angle in the following molecular model of XeF 2 ? A) less than 120° B) 120° C) less than 180° but greater than 120° D) 180° 5) 6) The enthalpy change for an endothermic process A) is positive B) is negative C) is zero D) depends on the standard state 6) 7) For which should the standard heat of formation • H ° f , be zero at 25°C? A) O
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Chem 1 exam 4 fall 07 - Chemistry 1450 Exam 4 Fall 2007...

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