2008_CEM_143_EXAM1_key

2008_CEM_143_EXAM1_key - CEM 143 Spring 2008 Exam 1: 13...

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CEM 143 Spring 2008 Exam 1: 13 February 2008 Name__________KEY______________ Section_____ PID___________ Seat number _____ 1 (24 pts.) 2 (24 pts.) 3 (12 pts.) 4 (10 pts.) 5 (25 pts.) 6. (5 pts.) Total 100 pts
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1.a (9 pts.) Provide the chemical formulas (i.e. C x H y ) for the following 1.b (3 pts) Rank the following 4 elements in order of INCREASING electronegativity. Cl, C, Li, F Lowest electronegativity Li, C, Cl, F highest 1.c (3 pts) Draw the electron dot structures for BF 3 . 1.d (3 pts) What is the formal charge on nitrogen in: 1.d (3 pts) Arrange the following in terms of INCREASING melting point. AB C A < C < B Packing arguments: A is branched, least effective packing, B is most symmetrical, packs most efficiently (maximizes van der Waals interations) H 3 C N CH 3 CH 3 + CH 3 formal charge = +1 Br C 8 H 14 C 7 H 12 C 11 H 15 Br B F F F
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2.d (12 pts) Draw the structures of: vinyl chloride R -1-bromo-1-chloropropane isopropyl bromide p -dichlorobenzene 2.d (12 pts) Name the following: 2-methyl-3-hexene methylcyclopentane o -bromonitrobenzene or o -nitrobromobenzene or 2-bromonitrobenzene or 2-nitrobromobenzene toluene or methylbenzene CH 3 Br NO 2 CH 3 Cl H H H Br Cl Cl Br CH 3 Cl H
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3.a (4 pts.) There are 3 important resonance structures in the bromination of benzene.
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2008_CEM_143_EXAM1_key - CEM 143 Spring 2008 Exam 1: 13...

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