2008_CEM_143_EXAM1 - CEM 143 Spring 2008 Exam 1: 13...

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CEM 143 Spring 2008 Exam 1: 13 February 2008 Name____________________________ Section_____ PID___________ Seat number and row _____ 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 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. B A C H 3 C N CH 3 CH 3 + CH 3 Br
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2.c (12 pts) Name the following: 2.d (12 pts) Draw the structures of: dichlorobenzene R -1-bromo-1-chloropropane p - isopropyl bromide vinyl chloride CH 3 Br NO 2 CH 3
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3.a (4 pts.) There are 3 important resonance structures in the bromination of benzene. I have drawn one of the structures. You provide the other two. 3.b (2 pts.) Circle the molecules that have conjugated bonds. 3 c. (4 pts) Draw 1,2-dimethylcyclohexane in a chair conformation with both methyl groups in axial positions. (I already drew the cyclohexane ring for you).
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2008_CEM_143_EXAM1 - CEM 143 Spring 2008 Exam 1: 13...

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