June 2010 Chemistry Regents #62-64

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Base your answers to questions 62 through 64 on the information below. When a uranium-235 nucleus absorbs a slow-moving neutron, different nuclear reactions may occur. One of these possible reactions is represented by the complete, balanced equation below. For this reaction, the sum of the masses of the products is slightly less than the sum of the masses of the reactants. Another possible reaction of U-235 is represented by the incomplete, balanced equation below. 62 Identify the type of nuclear reaction represented by equation 1. [1] HIGHLIGHT TO SEE THE ANSWER fission transmutation note= the transmutation answer is garbage, but accepted by the regents. You should know what fission is. 63 Write a notation for the missing product in equation 2. [1] HIGHLIGHT TO SEE THE ANSWER 142 Xe 54 or Xenon-142 64 Determine the half-life of krypton-92 if only 6.0 milligrams of an original 96.0-milligram sample remains unchanged after 7.36 seconds. [1] HIGHLIGHT TO SEE THE ANSWER Answer-1.84s 96.0mg=>48.0=>24.0=>12.0=>6.0mg 7.36seconds/4 half lives=1.84s   Next Questions

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