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ICP
10/2/12Finish radioactivity
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Warmup
1) Which particles are lightest: protons, neutrons, electrons?
2) Which particles are in the nucleus: protons, neutrons, electrons?
3) Write a nuclear symbol: 3 protons, 4 neutrons, 2 electrons
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Agenda
• Fission/Fusion Notes• Finish Lab Report (Centsium) / Check
homework (Half-Life Problems)• Go over answers to Half-Life Problems
• Tomorrow: Meet in computer lab with textbook and 1st quarter test study guide.
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What is fission?
http://library.thinkquest.org/17940/texts/fission/fission.html
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Why does the chain reaction work?
http://library.thinkquest.org/17940/texts/fission/fission.html
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C. Johannesson
F ission
• splitting a nucleus into two or more smaller nuclei
• 1 g of 235U = 3 tons of coal
U23592
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Where does the energy in fission come from?
• 235U + 1 neutron 2 neutrons + 92Kr + 142Ba + ENERGY
• The energy was stored in the strong binding forces that held the uranium nucleus together.
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Fission Chain Reactions
• An uncontrolled fission reaction results in a big explosion. Hiroshima!
• A controlled fission reaction will give nuclear power at a power plant.
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C. Johannesson
F ission
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C. Johannesson
Nuclear Power
• Fission Reactors Cooling Tower
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C. Johannesson
Nuclear Power
• Fission Reactors
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Fusion• Fusion occurs in the sun when four hydrogens are forced
together by the energy of high temperature and high pressure.
• 4 Hydrogens 1 Helium.• What bizarre thing happened?• The protons changed to neutrons. This change releases
energy, and this is why fusion produces energy.
Fusion
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C. Johannesson
Mass Defect
• Difference between the mass of an atom and the mass of its individual particles.
4.00260 amu 4.03298 amu