Nuclear Chemistry: Nuclear fission

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Nuclear Chemistry


<ul><li> 1. Nuclear ChemistryNuclear FissionPrepared By:Julie S.R.Roll No: 9Physical Science,GCTE,Trivandrum</li></ul> <p> 2. Involve changes in the composition of nuclei Accompanied by the release of tremendousamounts of energy 3. 3Nuclear FissionIn nuclear fission, a large nucleus is bombarded with a smallparticle the nucleus splits into smaller nuclei andseveral neutrons large amounts of energy are released 4. 4Nuclear Fission some elements undergo fissionspontaneously some elements can be induced to undergofission when bombarded with otherparticles (e.g. neutrons)When a neutron bombards U-235, an unstable nucleus of U-236 forms and undergoesfission (splits) smaller nuclei are produced such as Kr-91 andBa-142 neutrons are released to bombard more 235U 5. 5Nuclear Fission Diagram andEquation1 235 236 91 142 10 92 n + U 92 U 36 Kr + 56Ba + 30n + energy 6. The Atomic Bomb(FISSION) when the nucleus of U-235 splits, 2isotopes are formed, plus neutrons areemitted these neutrons collide with other U-235atoms, causing them to undergo fission;they release neutrons, and so on The result - CHAIN REACTION!! 7. 7Chain ReactionA chain reaction occurs when a critical mass ofuranium undergoesfission releasing a largeamount of heat andenergy that producesan atomic explosion 8. 9Nuclear Power PlantsIn nuclear power plants, fission is used to produce energy control rods in the reactor absorb neutrons toslow and control the chain reactions of fission 9. 1) Fission heats up water in vessel and heat iscarried away.2) This heat is used to heat up water in a secondsystem, which turns into steam.3) Steam turns turbine of a generator.4) Generator makes electricity. 10. Thank You </p>


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