S10_Lec5N - CHM 11500 Lecture 5 Nuclear Chemistry Buddy...

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CHM 11500 Lecture 5, 06-21-10 Nuclear Chemistry
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Buddy question What percent of the original 14 C remains in the heartwood of a bristle cone pine that is 3000. y old? 14 C 14 N + e - t 1/2 = 5730 y ln{N o /N} = kt ln x = y y = e x ln 2 = kt 1/2
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Buddy question What percent of the original 14 C remains in the heartwood of a bristle cone pine that is 3000. y old? 14 C 14 N + e - t 1/2 = 5730 y ln{N o /N} = kt ln x = y y = e x 69.6 % ln 2 = kt 1/2
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Nuclear Stability Band of Stability. These nuclei are not radioactive. Heaviest stable nucleus is 209 83 Bi #n = #p
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Predicting Types of Nuclear Decay n/p too large increase number of protons n/p too small increase n or reduce p
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Predicting Types of Nuclear Decay How would we expect Z to decay? Decay increases N/Z Convert proton to neutron Z
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14 7 N 7 1 1 H + 7 1 0 n 14.0031 amu 14.11543 amu N.B.E. for N-14 = 1.68 x 10 -11 J/nuclide Nuclear binding energy Mass number BE / nucleon = Binding energy per nucleon is a guide to the type of nuclear reactions nuclei will under go.
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Binding Energy per Nucleon The greater the binding energy per nucleon, the more stable the nucleus. B.E. per nucleon maximizes around 56 Fe. These are the most stable nuclei.
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