CHM152Chapter 22 Cont

Chemistry (MasteringChemistry Series)

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2/11/2009 1 C HAPTER 22 C ONT 22.6 N UCLEAR F ISSION & F USION  Nuclear Reactors ~ Same fission as bombs, but controlled | Containment vessel surrounded by circulating coolant | Control Rods – boron or cadmium ~ Absorb neutrons (regulate flow) ~ Lowered and raised–barely self sustainable rate | Energy heats coolant Æ steam drives turbine (electricity) | UO 2 pellets w/ 3% encased in zirconium rods ~ Pressure system filled with water (control neutrons) | Controls & small amounts don’t make a bomb, but can have overheating and thus meltdown | 21% of world’s power ~ Problem waste disposal F F  Nuclear Fusion ~ Light nuclei combing | H Æ He ~ Fi Fusion powers our sun
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2/11/2009 2 22.6 N UCLEAR F ISSION & F USION  Fusion Cont. ~ Fusion as a power source | Hydrogen isotopes cheap and plentiful N di ti t | No radioactive waste ~ 1 of many problems with fusion as a power source | T = 40,000,000 K needed (yikes!) ~ Would cold fusion be possible? 22.7 N T RANSMUTATION  <300 of 3600 known isotopes occur naturally ~ Nuclear Transmutation – change of one element into another |
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CHM152Chapter 22 Cont - C HAPTER 22 C ONT 22.6 N UCLEAR F...

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