CEM143_2006_Exam_1_key

CEM143_2006_Exam_1_key - CEM 143 Fall 2006 Exam 1 6 October...

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CEM 143 Fall 2006 Exam 1 6 October 2006 Name_________KEY____________ Section_____ PID___________ 1 (21 pts.) 2 (24 pts.) 3 (12 pts.) 4 (11 pts.) 5 (24 pts.) 6. (8 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. F, O, Li, N Lowest electronegativity Li < N < O < F highest 1.c (3 pts) Draw the electron dot structure forAlCl 3 . (Consider only the valence electrons of Al). 1.d (3 pts) What is the formal charge on boron in: 1.e (3 pts) Arrange the following in terms of INCREASING melting point. H 3 CO B OCH 3 OCH 3 H 3 CO formal charge = -1 C C 8 H 14 C 7 H 12 C 9 H 14 AB C A, B, C. - C is most symmetrical, packs best; A is least symmetrical Al Cl Cl Cl
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2.d (12 pts) Draw the structures of: m -dibromobenzene S -1-bromo-1-chloropropane tert -butyl bromide allyl chloride 2.d (12 pts) Name the following: Br Br C CH 3 Br CH 3 CH 3 Br C CH 2 CH 3 Cl H Cl allyl group Br 4-bromo-3-methylheptane Cl Cl p -dichlorobenzene 1,4-dichlorobenzene cyclohexene CC CH 3 CH 3 2-butyne
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3.a (3 pts.) You can draw 3 resonance structures that describe the intermediate formed in the
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CEM143_2006_Exam_1_key - CEM 143 Fall 2006 Exam 1 6 October...

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