Key1[1] - Chemistry 140A Whitesell Fali Quarter, 2006 First...

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Unformatted text preview: Chemistry 140A Whitesell Fali Quarter, 2006 First Midterm Exam, Monday October 16 middle last name initial first name Student ID Number Your answers to this exam are to be oniy 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 of any pages for answers. Up to One week after your exam is returned you may submit it for regrading if and only if you have made NO marks on the exam except for a star (*) next to the munber(s) of the question(s) you. would like regraded. 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) If you feel that we have made an addition error in your score, check the box at the right 1 2 3 4 5 6 7 8 9 0 1234567890 [3 El l. The activation energy difference necessary to produce a rate difference of 100:1 is: D 4.1 kcalfmole [I 13.5 kcalfmole- D 1.35 kcalfmole 2.? local/mole 2. ThepKaongo is: El 7 [I 60 15.6 [I 14 Hybridization of a 25 and a single p orbital results in: D 3 sp hybrid orbitals El 3 sp2 hybrid orbitals 2 Sp hybrid orbitals El 3 sp3 hybrid orbitals DJ 4. The electrOnegativity of C is: 2.5 I] 3.0 III 3.5 [:l 4.0 5- ThepKaofI-"IgO is: El 7 I: 60 15.6 D 14 6. In 2-methylheptane, all of the carbon atoms have hybridizatiou of: |:| sp Sp: 1:] sz El 3134 7. Draw electron-dot pictures for CHZCIZ and ‘OH including all lone pairs of electrons. Place your answers in the boxes below. 8. Using line notation, draw structures for the following compounds in the boxes provided. 2,3—dimethylheptane 3-isopropylhexane 2,2,4,4—tetramethylhexane Your signature (in ink) 2 9. Label all carbon atoms in 2-methylpentane as primary, secondary, or tertiary. Place your answer in the box below. 10. Draw the expected potential—energy diagram for the rotation about the C2-C3 bond in 2,3-dimethylbutane. Only relative energy positions are required, you need not and should not include any energy values. Include the Newman projections of each staggered and eclipsed conformation. You should NOT include any duplicates (to save you time-hint: there are only two unique eclipsed and two unique staggered conformations). Put your answer in the box below. 1—! L' 3" gal-IA p0. [Du-fang .— l. kc. in’ier‘ac'i‘ions Z-gaac fa bwi'twe~ like. Endanae'il'ans 11. Draw a picture of an ethyl radical that shows the hyperconjugation that makes this radical more stable than a methyl radical. Your signature (in ink) 3 12. Draw all possible isomers of C7I-116 (as line notations, n0 atoms, only bond lines). Put your answers in the boxes below. But one and only one isomer in each of the boxes below. 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. Your signature (in ink) 4 13. Write out the propagation steps of the mechanism for the free radical chlorination of ehloromethane (CH3C1) to form dichloromethane (CH2C12)_ Use the appropriate curved arrows to Show the movement of electrons. Put your answer in the box below. Your signature (in ink) S ...
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Key1[1] - Chemistry 140A Whitesell Fali Quarter, 2006 First...

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