1022JDBOMIDTERMEXAMICHAPTERS10,11,12,13&15SPRING2010MAINCAMPUSVersionAAnswerKey

- Dr Jim Bloxton CHEM 1022 Spring 2010 MIDTERM EXAM I 12 13 15 Name Recitation Day and Time Answer Key Please place your name recitation day and

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Dr. Jim Bloxton Name CHEM 1022 Spring 2010 Recitation Day and Time MIDTERM EXAM I Answer Key Please place your name, recitation day and time on the front page of this exam. Group Numbers: H, K IA; C IVA; N VA; O VIA; I VIIA 1. Write a Lewis structure for (CH 3 ) 3 N and give the molecular geometry and predict the central bond angle about the N atom in (CH 3 ) 3 N. The molecular geometry is trigonal pyramidal and the bond angle about the N atom is 107.3 . H H .. H─C─N─C─H H H H─C─H H 2. Write condensed structures for two compounds that are isomers and are both secondary alcohols and have the formulas C 6 H 14 O. Various answers are possible. CH 3 CH 2 CH 2 CH 2 CHCH 3 (CH 3 ) 2 CHCH 2 CHCH 3 OH OH 3. Draw an expanded structural formula of a compound that contains an aldehyde and an alkyne and has the formula C 6 H 8 O. H H H O H─C≡C─C─C─C─C─H H H H 4. Identify the polar bonds in problem 3 and indicate the direction of polarity in the polar bonds in problem 3. + ὁ ὁ - C═O
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5. Draw the Lewis structure for an ester with the formula C 2 H 4 O 2 . If this cannot be drawn then explain why not. :O: H .. H─C─O─C─H .. H 6. Write the structure of an alcohol that is an isomer of a carboxylic acid that has five carbons. Various answers are possible. CH 3 OCH 2 CH═CHCH 2 OH 7. What is the name of the following compound? (CH 3 CH 2 ) 2 C(CH 2 ) 4 CH 3 CH 2 CH(CH 3 ) 2 4,4-diethyl-2-methylnonane 8. Which compound would you predict has a higher boiling point and why: 2-methylnonane or 4-isopropyl-2-methylpentane? 2-Methylnonane will have the higher boiling point since it has a longer continuous chain of carbon atoms and it has less branching and also has a higher molecular weight than 4- isopropyl-2-methylpentane. All of these factors result in stronger London Dispersion forces for 2-methylnonane and a higher boiling point. 9.
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This note was uploaded on 03/29/2011 for the course CHEMISTRY 1022 taught by Professor Jimbloxton during the Spring '10 term at Temple.

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- Dr Jim Bloxton CHEM 1022 Spring 2010 MIDTERM EXAM I 12 13 15 Name Recitation Day and Time Answer Key Please place your name recitation day and

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