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# Homework 2 - Answers - Homework Problem Set 2 Iverson...

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Homework Problem Set 2 Iverson CH310N Due Friday, February 1 Chemistry 310N Dr. Brent Iverson 2nd Homework January 23, 2008 NAME (Print): _____________________________ SIGNATURE: _____________________________ Please print the first three letters of your last name in the three boxes

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Homework Problem Set 2 Iverson CH310N Due Friday, February 1 Score: _________
Homework Problem Set 2 Iverson CH310N Due Friday, February 1 (1 pt. each) Circle all the statements relating to the theory of NMR that are true. A magnetic field will cause charges to move. A magnetic field will not cause charges to move. Moving charge creates a magnetic field. Moving charge does not create a magnetic field. Electrons, neutrons, and protons are all charged. Neutrons and protons are both charged. Only electrons are charged. Both electrons and protons are charged. Atomic nuclei with an odd atomic mass or an odd atomic number have a quantum mechanical property called spin. The best way to the think about nuclear spin is as if nuclear postive charge (from the protons) were circulating within the nucleus, thereby creating a small magnetic field that can interact with a strong laboratory magnetic field. 1 H and 13 C nuclei have a spin quantum number of 2. 1 H and 13 C nuclei have a spin quantum number of 1. 1 H and 13 C nuclei have a spin quantum number of 1/2. The two spins states of a 1 H nucleus in a strong magnetic field are +1 and -1. The two spins states of a 1 H nucleus in a strong magnetic field are +1/2 and -1/2. The two spins states of a 1 H nucleus in a strong magnetic field are +2 and -2.

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Homework Problem Set 2 Iverson CH310N Due Friday, February 1 A magnetic field will cause the electron density to circulate in the molecule. The circulating electron density will create its own magnetic field that is in the same direction as the laboratory magnetic field. The circulating electron density will create its own magnetic field that opposes the laboratory magnetic field. A 1 H nucleus with spin +1/2 will be higher in energy than an equivalent nucleus with a spin of -1/2 The difference in energy between +1/2 and -1/2 spin states for a given 1 H nucleus is directly proportional to the strength of the external magnetic field. If electromagnetic energy of the precise energy diffence between the +1/2 and -1/2 spins states is used to irradiate the sample, the energy is absorbed as the spin "flips" from the +1/2 state to the -1/2 state. "Resonance" in NM R refers to the phenomenon of absorption of energy when a nuclear spin "flips".
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