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practice_exams_MIDTERM 1 Winter 06

practice_exams_MIDTERM 1 Winter 06 - university of washing...

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1 CHEMISTRY 162A MIDTERM EXAM #1 Winter Qtr 2006 Friday, January 27, 2006 Name: TA Section: Student Number: TA Name: Score (page) 1______, 2______, 3______, 4_____ 5_____ 6 _______ TOTAL _______ The periodic table and other information are provided as a separate sheet for your convenience. ANSWER ALL QUESTIONS B
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2 1. ( 4 points ) The hybridization of each carbon in acetylene gas HCCH is: a) sp b) sp 2 c) sp 3 d) dsp 3 e) d 2 sp 3 2. ( 4 points ) What is the hybrid orbitals used by oxygen for bonding in CO 2 ? 3. ( 6 points ) Consider the organic molecule shown below: H 2 C CH C CH 2 C N O 1 2 3 4 5 (i) Select the correct set of hybridizations of carbon atoms. (Lone pairs are not drawn in.) C–1 C–2 C–3 C–4 C–5 (ii) The number of sigma bonds is __________ and the number of pi bonds is __________. 4. ( 6 points ) Use the MO theory to decide: a. The valence electron configuration for nitric oxide, NO. b. Nitric oxide anion NO - is diamagnetic: True or false? ________
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