chm115_lecture5

chm115_lecture5 - Chemistry 115 Lecture 5 Outline Chapter...

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Chemistry 115 Lecture 5 Outline Chapter 23 Radioactive Decay Nuclear Stability Nuclear Half-lives Carbon Dating HW2: Due Wed., Jan 26 (11 pm) Recitation: Ch 23: Radioactive Decay, Nuclear Stability Carbon Dating, Nuclear Power, Fission, Fusion, Mass Defect, NB Energy EXAM 1: Tues Feb 15. Covers review material in Chap. 1,2, 4, 11, and Nuclear, Chap 23. (Lectures 1-7).
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The product is 28 13 Al, an unstable nuclide with a half- life of 2.3 min that will decay to 28 14 Si and a β particle. Decay of a series of products is common behavior. Example Question Σ reactant charges = Σ product charges Σ reactant mass numbers = Σ product mass numbers Identify the atomic number of X. 25 12 Mg + 4 2 He A Z X + 1 1 H
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Radioactive Decay: U-238
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Can we predict a decay? Band of Stability. These blue nuclei are not radioactive. Heaviest stable nucleus is 209 83 Bi #n = #p Nuclear Stability, Fig. 23.3
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N/Z too large- increase number of protons Nuclear Stability, Fig. 23.3 N/Z too small- increase N or reduce Z
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Band of Stability and Band of Stability and Radioactive Decay Radioactive Decay 243 95 Am 4 2 He + 239 93 Np α emission reduces Z β emission increases Z 60 27 Co
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chm115_lecture5 - Chemistry 115 Lecture 5 Outline Chapter...

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