August 2017 Chemistry Regents #82-85

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Questions 82-85

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Base your answers to questions 82 through 85 on the information below and on your knowledge of chemistry.

 

The isotope Rn-222 is produced by the decay of uranium in Earth’s crust. Some of this isotope leaks into basements of homes in areas where the ground is more porous. An atom of Rn-222 decays to an atom of Pb-206 through a series of steps as shown on the graph below.

 82 Determine the number of neutrons in an atom of Pb-214. [1]

Answer-->  132

83 Complete the nuclear equation in your answer booklet for the decay of Po-218 by writing a notation for the missing product. [1]

Answer-->  alpha 

4

He

2

84 Determine the fraction of an original sample of Rn-222 that remains unchanged after 7.646 days. [1] 85 Explain, in terms of elements, why the decay of Bi-210 is considered a transmutation. [1]

Answer-->  1/4  or 0.25  or 25%

85 Explain, in terms of elements, why the decay of Bi-210 is considered a transmutation. [1]

Answer-->A different element forms.

 

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

Questions 51-52 Questions 53-54 Questions 55-58 Questions 59-60 Questions 61-65 Questions 66-68 Questions 69-72 Questions 73-77  Questions 78-81  Questions 82-85

 

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