January 2017 Chemistry Regents #83-85

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 #83-85
  

The radioisotope Mo-99 naturally decays to produce the metastable isotope Tc-99m, which is used in medical diagnosis. A doctor can obtain images of organs and bones by injecting a patient with a solution of Tc-99m. The half-life of the metastable Tc-99m is six hours.

83 Complete the nuclear equation in your answer booklet for the nuclear decay of Mo-99. [1]

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0 B
-1
0 e
-1

84 State both the number of protons and the number of neutrons in a Tc-99 nuclide. [1]

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Protons ==>43 Neutrons ==>56

85 Determine the fraction of an original sample of metastable Tc-99m that remains unchanged after 24 hours. [1]

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1/16
  

Other Regents Exams

  

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85