June 2014 Chemistry Regents #83-85

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Question 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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Question 83-85

 

 

Base your answers to questions 83 through 85 on the information below and on your knowledge of chemistry.

Illuminated EXIT signs are used in public buildings such as schools. If the word EXIT is green, the sign may contain the radioisotope tritium, hydrogen-3. The tritium is a gas sealed in glass tubes. The emissions from the decay of the tritium gas cause a coating on the inside of the tubes to glow.

83 State, in terms of neutrons, how an atom of tritium differs from an atom of" hydrogen-l. [I]

Answer--> tritium has more neutrons  (2 more neutrons)

 84 Determine the fraction of an original sample of tritium that remains unchanged after 24.62 years. [1]

Answer--> 1/4     (24.62y is 2 half lives...1-->1/2-->1/4)

85 Complete the nuclear equation in your answer booklet for the radioactive decay of tritium, by writing a notation for the missing product. [1]

3

H -->

0

B  +

 

1

-1

_______
 
Answer---> 3

He

2

Conversion Table June 2014

raw score (out of 85)scale score (your grade)
7990
75 85
7180
5165

 

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 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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