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chem 255 final exam

chem 255 final exam - Part I Part II CHM 255 Final Exam(May...

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CHM 255 Final Exam (May 3, 2007) Name (Print) _______________________ Instructions: Answer in the spaces provided. Write the answers in pen only. ( Exams written in pencil will not be re-graded) . Worksheets are attached at the end of exam; nothing written on these worksheets will be considered for grading. Also attached is a table of IR absorption data. Part I consists of questions drawn from the entire course. Part II examines the material covered since the last hour exam. There are a number of short-answer questions throughout Parts I and II. You are urged to do these questions first; they will provide you with the most points per time spent . This exam is 14 pages. Part I A (50 points) ( Semester test questions) Answer the following questions by choosing among the choices offered or by inserting a response. Each is worth 4 points unless otherwise noted. There will be minimal part credit given in this section. 1. Which one of the following is NOT true? A nodal region in an orbital: a. occurs where the wave function changes sign b. represents a region of maximum electron density c. is associated with increasing energy for that orbital 2. (3 pts) Indicate the hybridization of the circled carbon atoms in the following structures: C H 3 C H 3 C H 2 CCH 3 O 3. (6 pts) 1 Part I Part II
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i. What is the hybridization of the nitrogen atom in the structure below? CH 3 C N sp sp 2 sp 3 ii. Insert the nitrogen valence electrons as they are employed to generate the structure in “i” using the template below that corresponds to your answer in “i”. Show the electron spin, making sure to follow Hund’s Rule. ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ sp sp 2 sp 3 4. (3 pts) How many degrees of unsaturation (i.e what is the Index of Hydrogen Deficiency) for the formula C 7 H 9 ClN 2 O?
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