EXAM12007KEY

EXAM12007KEY - CHEMISTRY 2261 EXAM 1 September 19, 2007...

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CHEMISTRY 2261 September 19, 2007 EXAM 1 NAME (PRINT)____________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TOTAL LIST number Answer Key 1. (8 pts) Fill in the missing elements in their proper positions in the Periodic Table: 1A 2A 3A 4A 5A 6A 7A 8A He Ne Ar Kr Xe Se Te Si Na Li Mg Be H C Br Cl Al B P N S OF I 2. (6 pts) Add formal charges to the following Lewis structures where necessary. C C H H C C C C B H H C C H H N N a) b) c) O N C C C H H H H H H H H H H ++ + 3. (10 pts) Draw acceptable Lewis structures of the following uncharged compounds by adding all the nonbonding electrons, multiple bonds and any necessary formal charges. O N O b) a) CN N H H C H H H + + 4. (4 pts) Calculate the equilibrium constant ( K eq ) for the following acid-base reaction. + p K a = 2.65 K eq = + CO 2 H F CO 2 F CO 2 Cl Cl CO 2 H Cl Cl p K a = 0.65 10 -2
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2 5. (8 pts) Draw resonance structures of the cation [C(NH 2 ) 3 ] + , by adding all the nonbonding electrons, multiple bonds and any necessary formal charges. Indicate the charge on nitrogen and the C-N bond order for the resonance hybrid of these structures.
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EXAM12007KEY - CHEMISTRY 2261 EXAM 1 September 19, 2007...

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