2008_10_24_11_33_10

2008_10_24_11_33_10 - Chemistry 140A Whitesell Fall...

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Unformatted text preview: Chemistry 140A Whitesell Fall Quarter, 2008 First Midterm Exam, Monday October 20 first name middle last name initial Student ID Number 4 _ - Your answers to this exam are to be only your own work. You may use no written information during this test period other than the five pages of this exam. You may not use the back ol‘any pages for answers. Up to one week (exactly 168 hours) after your exam is retumed you may submit it for regrading if and only if you have made NO marks on the exam except for a star (*) ON THIS PAGE next to the number(s) of [he question(s) you would like regradcd. your signature (read the above before signing) To request regrading. Sign below and check the appropriate boxes. your signature i would like the questions marked with a star (*) regraded (check box at right) El If you feel that we have made an addition error in your score, check the box at the right El 1. The activation energy difference necessary to produce a rate difference of 1000:] is: I2] 4.1 kcal/mole CI 13.5 kcal/mole D 1.35 kcal/rnole CI 2.7 kcal/mole 2. The pKa acetic acid is: El 7 [21 4.7 CI 15.6 CI 14 3. Hybridization ofa 2s and two 2p orbital results in: D 3 Sp hybrid orbitals IE 3 spl hybrid orbitals [I 2 Sp hybrid orbitals El 3 ap3 hybrid orbitals 4. The electronegativity ot‘N is: D 2.6 I] 3.0 CI 3.4 1:] 4.0 In Z-nlethylheptane. all of the carbon atoms have hybridization of: El sp 5133 El sp2 [:1 5p4 6. Draw electron-dot pictures for CH3C1 and "01-1 including all lone pairs of electrons. U) Place your answers in the boxes below. 7. Using line notation, draw structures for the following compounds in the boxes provided. 2.3-dimethylpentane 3-isopropylheptane 23,4,4-tetrachlorohexane la.) Your signature (in ink) 8. Label all carbon atoms in 2.3—dimethylhexane as primary! secondary. or tertiary. Place your answer in the box below. 9. Draw Newman projections for the most stable conformation about the bold bond of the molecules shown . ‘__ Chi) >k/ H H 14;: CI"? (.147 l/ >U\ ” “*3 ll 1 l CH _) 10. Draw a picture of an ethyl radical that shows the hyperconiugation that makes this radical more stable than a methyl radical. Your signature (in ink) 3 l 1. Draw all possible isomers ofC7l~l16 (as line notations, no atoms, only bond lines). Put your answers in the boxes below. Put one and only one isomer in each of the boxes below. Each correct answer will receive 1 point but If you duplicate an isomer, neither answer will receive credit. There may be more boxes than you need. A bonus will be award for perfect answers to this question. Your signature (in ink) 12. Write out the propagation steps of the mechanism for the free radical chlorination of chloromethane (CH3C1) to form diehloromethane (CHZCI2). Use the appropriate curved arrows to show the movement of electrons. Put your answer in the box below. 'J I Your signature (in ink) ...
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2008_10_24_11_33_10 - Chemistry 140A Whitesell Fall...

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