Chapter 4 Part 1

Chapter 4 Part 1 - Exam No. 1 (see key on WebCT) Range:...

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Exam No. 1 ( see key on WebCT ) • Range: 23/60 (38.3%) to 59/60 (98.3%) • STD DEV: 6.68 • Median: 49.6/60 (82.7%) • No curve for now Read Chapter 4 first time by Tuesday, 10/9 Homework: Chapter 4, 34 – 52 even. Do relevant review questions. Due Thursday 10/11 1 st Extra Credit Deadline: October 11 (see web site for instructions)
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Chapter 4 Nuclear Chemistry
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• The sun is a giant nuclear (fusion ) reactor • The sun is the ultimate source of virtually all energy on earth • Power plants use uranium fission reactions • Risks and Benefits of Nuclear Power? • Not all radioactive elements are equally harmful
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Nuclear Explosion WWII Nagasaki, Japan Nuclear Accident Chernobyl, Ukraine • Must also consider how to dispose of nuclear waste and how to deal with threats of terrorists with nuclear weapons
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Nuclear Chemistry
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•Ionizing radiation • Get a detector Radiation Sources for your home!
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Background Radiation • 3/4ths of all exposure to ionizing radiation comes from background radiation . • -potassium has a naturally occurring radioisotope (unstable isotope) that is in our bodies: 40 K • Most of the remaining ¼ comes from medical irradiation such as X-rays. • See video (start at 3:05 min) and article (Fiesta Ware) on radioactivity of common objects • Little comes from nuclear accidents: Chernobyl, Ukraine 1986, Three Mile Island plant, PA 1979
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Radiation Damage to Cells • Radiation is capable of removing electrons from cells, forming ions; hence the term ionizing radiation . • Molecules can also splinter into neutral fragments called free radicals . Free radicals can disrupt cellular processes.
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Radiation Damage to Cells • Radiation often affects the fastest growing cells and tissues such as white blood cells and bone marrow (can lead to anemia). • Ionizing radiation can also disrupt DNA, causing mutations -Role in evolution? Role for K-40 in evolution? • Decrease Fear Factor - Not all radioactivity is particularly harmful !
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Nuclear Equations • In nuclear equations, we balance nucleons (protons and neutrons). The atomic number (number of protons) and the mass number
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This note was uploaded on 04/23/2009 for the course PSYCHOLOGY 11002 taught by Professor Heyman during the Spring '09 term at BC.

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Chapter 4 Part 1 - Exam No. 1 (see key on WebCT) Range:...

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