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THE SUN: Fusion, Fission and Combustion

Earth & Environmental Science. THE SUN: Fusion, Fission and Combustion. Definitions. Fusion- Combining of nuclei Fission- Splitting of a nucleus Combustion- Chemical reaction in which an atom combines with oxygen. What is the Fuel?. Fusion Uses small, light atoms like Hydrogen Fission

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THE SUN: Fusion, Fission and Combustion

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  1. Earth & Environmental Science THE SUN: Fusion, Fission and Combustion

  2. Definitions • Fusion- Combining of nuclei • Fission- Splitting of a nucleus • Combustion- Chemical reaction in which an atom combines with oxygen

  3. What is the Fuel? • Fusion • Uses small, light atoms like Hydrogen • Fission • Uses large, heavy atoms like Uranium • Combustion • Uses any substance that will react with Oxygen

  4. How Does it Start? • Fusion • Requires great heat and pressure • Fission • Starts when a neutron strikes the nucleus and causes it to split. More neutrons are released causing a chain reaction. • Combustion • Requires small amount of energy to activate the reaction.

  5. What is Released and/or Converted? • Fusion • Releases large amounts of energy. Mass is converted to energy. • Fission • Releases large amounts of energy. Mass is converted to energy. • Combustion • Releases smaller amounts of energy that are present in the bonds between atoms. Reactants start at a higher energy level than products.

  6. How Long does the Reaction Last? • Fusion • Does not explode because there is no chain reaction • Fission • Can explode because of chain reaction • Combustion • Once started, heat from combustion will keep the reaction going as long as the reactants are present.

  7. Where does it Happen? • Fusion • Happens in core of a star. Can happen briefly in a laboratory. Happens in a hydrogen bomb. • Fission • Happens in nuclear power plants. Happens in an atomic bomb. • Combustion • Happens any time there is a fire. Can also happen slowly as in the case of something rusting.

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