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ICP

ICP. 10/2/12 Finish radioactivity. Warmup. Which particles are lightest: protons, neutrons, electrons? Which particles are in the nucleus: protons, neutrons, electrons? Write a nuclear symbol: 3 protons, 4 neutrons, 2 electrons. Agenda. Fission/Fusion Notes

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  1. ICP 10/2/12 Finish radioactivity

  2. Warmup • Which particles are lightest: protons, neutrons, electrons? • Which particles are in the nucleus: protons, neutrons, electrons? • Write a nuclear symbol: 3 protons, 4 neutrons, 2 electrons

  3. 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.

  4. What is fission? http://library.thinkquest.org/17940/texts/fission/fission.html

  5. Why does the chain reaction work? http://library.thinkquest.org/17940/texts/fission/fission.html

  6. Fission • splitting a nucleus into two or more smaller nuclei • 1 g of 235U = 3 tons of coal C. Johannesson

  7. 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.

  8. Fission Chain Reactions • An uncontrolled fission reactionresults in a big explosion. Hiroshima! • A controlled fission reaction will give nuclear power at a power plant.

  9. Fission C. Johannesson

  10. Cooling Tower Nuclear Power • Fission Reactors C. Johannesson

  11. Nuclear Power • Fission Reactors C. Johannesson

  12. 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

  13. Mass Defect • Difference between the mass of an atom and the mass of its individual particles. 4.00260 amu 4.03298 amu C. Johannesson

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