ICP 10/2/12 Finish radioactivity. Warmup 1)Which particles are lightest: protons, neutrons, electrons? 2)Which particles are in the nucleus: protons,

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Presentation transcript:

ICP 10/2/12 Finish radioactivity

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

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 1 st quarter test study guide.

What is fission?

Why does the chain reaction work?

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

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.

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.

C. Johannesson F ission

C. Johannesson Nuclear Power Fission Reactors Cooling Tower

C. Johannesson Nuclear Power Fission Reactors

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

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