Exam 1 Practice Key

Exam 1 Practice Key - Examination I (Practice) Bennett...

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Unformatted text preview: Examination I (Practice) Bennett Department of Chemistry West Virginia University February 7th, 2008 Name: This exam is a closed book, closed notes. Calculators and a molecular model set are allowed. You must show your work in order to receive partial credited. Question #1 (12 points): Question #2 (21 points): Question #3 (18 points): Question #4 (18 points): Question #5 (14 points): Question #6 (8 points): Question #7 (9 points): Total (out of 100) : Chemistry 233 Spring 2008 Question 1 (20 points): 1a) Circle the most protons in the following molecules and provide the approximate pKa of that proton (5 points). 0 H H H20 A CH4 )=< NH4+ HsC CQ H H /(9 5 #5 40 l 0 1b) provide the Keq and AG for the given reaction (4 points). o G) / o / k + LI 9 N A L?) + HN H30 CH3 \ H3C 5H2 3 \ 20 a 5' 1d) Rank the acidity of the following protons from the strongest to the weakest (8 points). H30—NH2 H3C—OH H3C—SH @515“ng ' (a o 07 row i — j: H300 H3C® NH2 H30 OH OH OAOH <3) “ one For“ ' .. o @ p-i Chemistry 233 Spring 2008 Question 2 (21 points): 2a) Draw the Lewis structures of the following molecules (5 points). (3ze BF3NH3 CsHe CHgBel Mae “I “ 02H4s Oi: C2H5AS I \\ ,‘H \H 2b) Draw the Lewis struetures of the following molecules label the formal charges (6 points). N05 we \\‘ - \\ “a CH3SO C “3 #5:.” 9: /9l_‘ CZH6AICI2' - CH3” ‘99 2c) Provide the formal charges of the bold atoms (note, some of the lone pair electrons are omitted for the simplification purpose and all asked atoms are octet unless other noticed) (10 points). ® Q O/CH3 /9 )OJ\ oéN/IN I[-l 9/0 Has—MEN Hsc-cc HaC-NQ O ch C/N Her-0» \ .. a 0 CH3 H2 /.h1\ 0 Chemistr 233 S rin 2008 Question 3 (18 points): 3a) Provide the example of the following functional groups (10 points). Amide Alkane Alkyne Ester Alcohol _ CH A ac a ' “m”? , . Lr B 0}» Thiol Acid Chloride Aldehyde Ketone Sulfide 3b) Use one sentence to clear explain each of the three major intermolecular interactions (6 points). Va“ lnMQC-by'on5 mama/«752g, dim365 w x R , I a p: Inbemcnéaions We?“ D./mle «0.,vde mustaan Pemmk do (a Mflmwflfiu 3c) Rank the general strength of the three intermolecular interactions (2 points . I m {em :25" M We“: . . a , ;a v Habowlka ; Q VQMAWUQ 91,5 Aalefiiéffliffiffi (mg fag?” Elfiaéfimfi wgfifi w (MWWWW* New x/H yang/ea, Question 4 (18 points): 421) Clearly indicate which reactant is the nucleophile and which one is electrophile in the following reactions (6 points). Ma; y“ :8 ‘ :3 it): o A + Na+ CN' H3C CH3 a» M E WK H30 CH3 xvi. E Chemistr 233 S rin 2008 4b) Explain whether the following reactions can occur (6 points). M Cl ~‘ L on + we ram/‘35 t 0" are more #61“: H20 H t A10 {348" Less Ml: «611m .. Era 4c) Label the electrophilic and Nucleophilic site Eighe following molecules (6 points). Question 5 (14 points): 5a) Provide the IUPAC name of the following molecules (6 points). Yk 5L5? will he M , {A firms”: fl Chemistry 233 Sgring 2008 53) Provide the structure of the molecules (4 points). 2,3-Dimethyl-butane 3E1? . 2,2,4,6—TetramethyI-heptane 5c) Label the 1°, 2°, 3° Hs of the following molecule (4 points). l Question 6 (8 points): v 4‘ 6a) Rank the boiling point of the following molecules (4 points). V\OH \/LOH \io H" \Ahu < “xx/\aH 4: \/l\?2 9+ W s W NLVW’MQ Chemistr 233 S rin 2008 6b) Rank the melting point of the following molecules (4 points). W n W \IVN¢V\(<>“< Question 7 (9 points): 7a) Explain why the HCECH has lower pKa than CH3-CH3 (3 points). fi? v’$ 3f3 6 W I fl flaw“ 9% 7b) Draw 5 isomers of C4H3 (3 points). (3% H x3“ 5' \ .. ' \ cH I % / ,3 (3%ET._C}£1 7c) Explain why A is less water soluble than B (3 points). CHO OHC CE CL A06? OH OH " ...
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This note was uploaded on 04/26/2008 for the course CHEM 233 taught by Professor Shi during the Spring '08 term at WVU.

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Exam 1 Practice Key - Examination I (Practice) Bennett...

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