Unit 4 Nuclear Reactions.

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Presentation transcript:

Unit 4 Nuclear Reactions

What happens when you shoot the cue ball into an area of densely packed pool balls? * they spread apart  you “BREAK” the pack

Nuclear Fission The splitting of a nucleus into two (2) nuclei with smaller masses. * “fission” means to divide

Only large nuclei with atomic numbers above 90 can undergo nuclear fission.

What happens in nuclear fission? n + U  Ba + Kr + 3n 1 Uranium atom 1 neutron 1 Barium atom 1 Krypton atom 3 neutrons

MASSIVE ENERGY RELEASE

Chain Reaction An ongoing series of fission reactions * Domino effect  a mouse trap setting off more mouse traps

Splitting 1 uranium nucleus produces several million times more energy than reacting 1 molecule of dynamite.

Nuclear Fusion The combining of two nuclei with low masses to form one nucleus of greater mass. * “fusion” means to put together

Nuclear fusion is difficult to induce because extremely HIGH temperatures are required. * A.K.A. = thermonuclear reaction

Our Sun, and all stars, are fueled by nuclear fusion reactions. * hydrogen atoms combine to create helium

Why do you think the Sun can go through nuclear fusion? Extremely high temperatures in the Sun’s core.

Scientist are searching for a way to induce and control nuclear fusion. * WHY?  unlimited supply of energy for electricity

THE END