Fission
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Nuclear Fission
What does this have to do with nuclear reactions?
QuickTimeª and a decompressor are needed to see this picture.
What is the difference between chemical reactions and nuclear reactions? • Recall that in chemical reactions, only the electrons are involved and the nucleus remains intact • Nuclear reactions involve the particles in the nucleus of the atom. – Protons – Neutrons
Is there more energy involved in nuclear reactions or chemical reactions? • There is a great deal more energy involved in nuclear reactions than in chemical reactions
What is nuclear fission? • Nuclear fission occurs when a heavy nucleus splits into two or more parts. • When the atom splits, a large amount of energy is released.
Nuclear Fission
Nuclear Fission
Nuclear Fission
QuickTimeª and a Sorenson Video decompressor are needed to see this picture.
How do you initiate fission? • The penetration of a large nucleus (such as U-235) by a neutron is one way to initiate a fission reaction.
What happens when an atom undergoes fission? • When an atom undergoes fission, atoms that have smaller nuclei result. In the process smaller particles such as neutrons may be ejected from the splitting nucleus.
How does a chain reaction occur? • If one or more ejected neutron strikes another U-235 nucleus, another fission reaction may occur. The continuation of this process is called a chain reaction. There must be a certain critical mass of fissionable material in close proximity for a chain reaction to occur.
How does this demonstrate a chain reaction?
QuickTimeª and a decompressor are needed to see this picture.
What is critical mass? • Critical mass is the amount of fissionable material required so that each fission reaction produces approximately one more fission reaction.
What else about the mass? • The mass of the products of a fission reaction is much less than the mass of the reactants.
Have you ever heard of fission? • Fission is the type of nuclear reaction that occurs in nuclear power plants, and in other nuclear applications (weapons, submarines, etc.)
What does this have to do with nuclear reactions?
QuickTimeª and a decompressor are needed to see this picture.
What is the difference between chemical reactions and nuclear reactions? • Recall that in chemical reactions, only the electrons are involved and the nucleus remains intact • Nuclear reactions involve the particles in the nucleus of the atom. – Protons – Neutrons
Is there more energy involved in nuclear reactions or chemical reactions? • There is a great deal more energy involved in nuclear reactions than in chemical reactions
What is nuclear fission? • Nuclear fission occurs when a heavy nucleus splits into two or more parts. • When the atom splits, a large amount of energy is released.
Nuclear Fission
Nuclear Fission
Nuclear Fission
QuickTimeª and a Sorenson Video decompressor are needed to see this picture.
How do you initiate fission? • The penetration of a large nucleus (such as U-235) by a neutron is one way to initiate a fission reaction.
What happens when an atom undergoes fission? • When an atom undergoes fission, atoms that have smaller nuclei result. In the process smaller particles such as neutrons may be ejected from the splitting nucleus.
How does a chain reaction occur? • If one or more ejected neutron strikes another U-235 nucleus, another fission reaction may occur. The continuation of this process is called a chain reaction. There must be a certain critical mass of fissionable material in close proximity for a chain reaction to occur.
How does this demonstrate a chain reaction?
QuickTimeª and a decompressor are needed to see this picture.
What is critical mass? • Critical mass is the amount of fissionable material required so that each fission reaction produces approximately one more fission reaction.
What else about the mass? • The mass of the products of a fission reaction is much less than the mass of the reactants.
Have you ever heard of fission? • Fission is the type of nuclear reaction that occurs in nuclear power plants, and in other nuclear applications (weapons, submarines, etc.)
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