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exam 1 key spring 08 - NAME(Print SIGNATURE Chemistry 310N...

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Chemistry 310N Dr. Brent Iverson 1st Midterm Feb. 21, 2008 NAME (Print): _____________________________ SIGNATURE: _____________________________ Please Note: This test may be a bit long, but there is a reason. I would like to give you a lot of little questions, so you can find ones you can answer and show me what you know, rather than just a few questions that may be testing the one thing you forgot. I recommend you look the exam over and answer the questions you are sure of first , then go back and try to figure out the rest. Also make sure to look at the point totals on the questions as a guide to help budget your time. Note: You must have your answers written in pen if you want a regrade!!!! Please print the first three letters of your last name in the three boxes For synthesis problems GO FOR PARTIAL CREDIT EVEN IF YOU DO NOT KNOW THE ENTIRE ANSWER!!!WRITE DOWN WHAT YOU DO KNOW IS IN THE REACTION SEQUENCE SOMEWHERE. YOU WILL GET PARTIAL CREDIT IF IT IS CORRECT
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15 14 13 12 11 10 9 8 7 (-) (-) (-) (-) (14) (21) (23) (35) (20) (26) (10) (13) (16) (8) (271) 16 6 Total T Score HW 17 18 19 Total Grade (HW score + Exam Grade) % 5 (15) (20) 4 (15) 3 2 (16) 1 Page Points (19)
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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)
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1 H 13 C 1 H 13 C Pg 1 _____________(16) 1. (1 pt each) Fill in each blank with the word that best completes the following sentences about NMR. Signature_________________________ For organic chemistry, NMR is primarily concerned with atoms having a spin quantum number of ________. The two most important isotopes for organic chemistry structure determination by NMR are _________ and ________. Of these two, ________ is a common isotope and the predominant isotope found in molecules, while ________ is very rare. Electron density is induced to move in a strong external magnetic field, and this movement induces a _________________ field that is _________________ to the external magnetic field. This has the effect of ______________________ the underlying nuclei from the external magnetic field. The signal for an 1 H atom with greater electron density around it will come at ___________________ ppm in an NMR spectrum compared to a similar 1 H atom with less electron density. The _______________ of adjacent nuclei influence each other. If 1 H atoms are no more than ____________ bonds apart, the spin states couple. THEORY: When there are two sets of adjacent H atoms, the number of peaks ___________________. For example, a CH 2 group with a CH 2 group and a CH 3 group on either side shows a theoretical maxium of _________________________ peaks in its signal! 1/2 magnetic opposed shielding lower three spins multiply 3 x 4 = 12 PRACTICE: For alkyl groups that can rotate freely, complex splittings simplify because the ______________________ _________________ ("J") are all about the same. In practice, if there are n adjacent H atoms, equivalent or not, you will see _______________________ peaks in a signal. This is an approximation, but almost always true on spectra taken with all but the most high resolution NMR spectrometers.
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