exam 3 key spring 08 - 10 9 8 7 6 5 4 3 2 (30) (24) (21)...

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Unformatted text preview: 10 9 8 7 6 5 4 3 2 (30) (24) (21) (29) (16) (22) (18) (15) (19) (26) (17) (19) (13) (16) (285) 11 1 Page Points 12 13 14 T Score HW Total Grade (HW score + Exam Grade) % Total Honor Code The core values of the University of Texas at Austin are learning, discovery, freedom, leadership, individual opportunity, and responsibility. Each member of the University is expected to uphold these values through integrity, honesty, trust, fairness, and respect toward peers and community. (Your signature) CH 3 CH 2- H R 2 C C H H H-N( i- C 3 H 7 ) 2 RC C H COR' O RC H 2 CR' O RC H 2 CH O RC H 2 CCl O RC H 2 RCH 2 O H HO H ROC O COR' O C H 2 RC O COR' O C H 2 RC O CR' O C H 2 H 4 N CO- H O R RCH 2 O H 2 H 3 O H-Cl 10 51-7 Compound pK a 3-5 15.7 16 18-20 11 23-25 18-20 13 15-19 40 Carboxylic acids !-Dicarbonyls !-Ketoesters !-Diesters Water Alcohols Acid chlorides Aldehydes Ketones Esters LDA Alkanes Terminal alkynes 25 Terminal alkenes 44 9.2 Ammonium ion Hydronium ion Hydrochloric acid Protonated alcohol-2-1.7 Pg 1 _____________(30) Signature_________________________ 1. (14 points) Suppose a relative of yours is having an MRI. In no more than four sentences, explain to them what is happening when they have the MRI scan. We will be looking for a minumum of 7 key points here. The popular medical diagnostic technique of magnetic resonance imaging (MRI) is based on the same principles as NMR , namely the flipping (i.e. resonance) of nuclear spins of protons by radio frequency irradiation when a patient is placed in a strong magnetic field . Magnetic field gradients are used to gain imaging information, and rotation of the gradient around the center of the object gives imaging in an entire plane ( i.e. slice inside patient ) . In an MRI image, you are looking at individual slices that when stacked make up the three-dimensional image of relative amounts of protons , especially the protons from water and fat, in the different tissues . True False 2. (2 pt. each) Here are a number of statements regarding aromaticity. Do not second guess yourself, this is not meant to be tricky! Check the appropriate box to indicate whether the statement is true or false. X X X X X X X B. According to Huckel's rule, aromatic molecules are flat, monocyclic, all ring atoms have a 2p orbital (no sp3 ring atoms) and there are 4n + 2 pi electrons (i.e. 2, 6, 10, 14.....). A. When using molecular orbital theory, it is best to think of electron density as being like waves, since it is described mathematically using wave equations. C. When drawing mechanisms or resonance contributing structures, the arrows indicate where positive or negative charges are moving between structures. D. When drawing mechanisms or resonance contributing structures, the arrows indicate where pairs of electrons are moving between structures....
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This note was uploaded on 02/09/2009 for the course CH 310 N taught by Professor Blocknack during the Spring '08 term at University of Texas at Austin.

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exam 3 key spring 08 - 10 9 8 7 6 5 4 3 2 (30) (24) (21)...

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