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keytest1 - CHM 2200C February 2 2005 Hour Test 1...

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CHM 2200C February 2, 2005 Hour Test 1 Name _______ KEY _____________________ (Please Print) You should have 4 pages. Print your name legibly on each page now . Blank sheets are available for scratch paper if you need them, but please put your answers on the test pages. If something is not clear, raise your hand and ask! Points 1. The formate ion (HCO 2 - ) has a central carbon with one hydrogen and two oxygens attached to it. Page Points 1 _ 28 _ 2 _ 31 _ 3 _ 26 _ 4 _ 15 _ Total __ 100 _ (2) (a) How many valence electrons are in the Lewis structure?: __ 18 ____ (H =1, C = 4, O = 2x6 = 12, neg. charge = 1) (6) (b) Draw the two Lewis resonance structures for the formate anion. 3 pts each structure; C O H O C O H O (2) (c) What is the hybridization of the sigma bonds to carbon? ____ sp 2 _________ (2) (d) What is the geometry about the carbon atom? _ trigonal planar (or 120 o ) ______ (8) 2. In the structure at the right, identify the hybridization of the sigma bonds to each of the carbon atoms specified by a letter. 2 pts each A: __ sp ___ B. ___ sp 2 ____ C. __ sp 2 __ D. ___ sp 3 ___ HC C C CH 2 O H C CH CH 2 CH 3 A B C D (8) 3. In the structure at the right, identify whether each of the specified carbon atoms is a primary, secondary, or tertiary carbon.
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