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Chem141 Chapter24 notes

Chem141 Chapter24 notes - Wenlong Wu Chem141 8:30AM Monday...

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Wenlong Wu Chem141 8:30AM Monday, November 05, 2007 Chapter notes 24 Nuclear Reactions and Their Applications 1044 Chemical reactions : substance change, atoms does NOT. Orbital electrons move, NOT nuclei, little energy and mass change, rxn rate affected by conc, temp, catal, etc Nuclear reactions : atoms are converted into another element, protons/neutrons affected, NOT electrons, large change in energy and mass, rxn rate affected by number of nuclei. 24.1 Radioactive Decay and Nuclear Stability 1046 \ 1. a stable nucleus remains intact indefinitely, but Majority of nuclei are unstable. 2. unstable nuclei exhibits radioactivity : spontaneously disintegrates/ decays , by emitting radiation. 3. the nucleus is small in volume but huge in mass 4. nucleons: protons and neutrons collectively 5. nuclide: is a nucleus with specific number of nucleons 6. isotopes: same number of protons, but different neutrons. 7. Radioactivity and types of emissions a. Marie Curie: polonium, radium. b. When a nuclide of one element decays, it changes into a nuclide of a different element. c. Types of radioactive emission: i. Alpha particles: ( α or 2 4 He) like the He nuclei ii. Beta particles ( β or β - or -1 0 β ) like electrons, emitted from
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