Fission and Fusion

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Fission and Fusion : 

Fission and Fusion

Fission : 

Fission Mass of a nucleus is slightly less than the mass of its parts. mnucleus < mprotons + mneutrons mass defect Mass defect is converted to energy, and holds the nucleus together E = mc2

Fission Reactions : 

Fission Reactions Large nucleus split into two or more smaller ones, with some particles left over (maybe) A tiny bit of mass is converted into energy E = mc2 Law of Conservation of Matter does not hold true!

Law of Conservation ofMatter and Energy : 

Law of Conservation ofMatter and Energy Matter and energy can be converted Total of mass and energy is conserved

Fission Reactions : 

Fission Reactions Small amount of matter is lost Large amount of energy is produced

Matter-Energy Conversion : 

Matter-Energy Conversion If a total of 1 gram of matter is converted to energy, how much energy would that be? E = mc2 E = 0.001 kg x (3 x 108 m/s)2 E = 9 x 1013 J (1/3 of the total energy produced in PA nuclear power plants in 2006)

Nuclear Power : 

Nuclear Power U + n  ? + ? + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  ? + ? + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  Ba + ? + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  Ba + Kr + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  Ba + Kr + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  Ba + Kr + ? + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power U + n  Ba + Kr + 3 n + Energy Mass numbers must balance Atomic numbers must balance

Nuclear Power : 

Nuclear Power In Pennsylvania, 34% of our electricity is produced using nuclear power. In the USA, 20% of our electricity is produced using nuclear power.

Nuclear Power Plant : 

Nuclear Power Plant Design Boiling Water Reactor (BWR) Pressurized Water Reactor (PWR) Model Two models will be built, labeled, compared Questions about nuclear power Questions about atomic theory

Nuclear Study so far… : 

Nuclear Study so far… Radioactive decay Nuclear bombardment Fission reactions Next… Fusion reactions

Nuclear Fusion : 

Nuclear Fusion Two small nuclei joined by bombardment High temperature High pressure

Nuclear Fusion : 

Nuclear Fusion H + H  ? + n + Energy

Nuclear Fusion : 

Nuclear Fusion H + H  ? + n + Energy

Nuclear Fusion : 

Nuclear Fusion H + H  ? + n + Energy

Nuclear Fusion : 

Nuclear Fusion H + H  He + n + Energy

Nuclear Fusion in Stars : 

Nuclear Fusion in Stars H  He + Energy +2 e+ + 2 neutrinos Since our sun is a smaller star, it will fuse H to He to C Larger stars fuse C to O to Ne to Mg to Si to Fe

Nuclear Fusion in Stars : 

Nuclear Fusion in Stars H  He + Energy +2 e+ + 2 neutrinos Elements heavier than Fe are formed when large stars undergo supernova explosions.

Nuclear Fusion on Earth : 

Nuclear Fusion on Earth Because of the very high temperatures and pressures needed and the very large amount of energy released, we cannot yet control fusion reactions.