June 2022 Chemistry Regents #51-53

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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 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85  
 

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Question 51-53

 

 

Base your answers to questions 51-

Baseyouranswerstoquestions51through53ontheinformationbelowandonyourknowledgeofchemistry. The two naturally occuring isotopes of lithium are Li-6 and Li-7. The table below shows the atomic mass and percent natural abundance for these isotopes.

 

51 State the number of electrons in an atom ofLi-7. [1]

Answer-->  3       (2-1 on PT)

52 Compare the energy of an electron in the first shell of a lithium atom to the energy of an electron in the second shell of the same atom. [1]

Answer-->The 2nd shell electron has more energy than the 1st shell electron   or

the 1st shell electron has less energy than the 2nd

53 Show a numerical setup for calculating the atomic mass of the element lithium. [1]

Answer-->  ((6.015u*7.59%) + (7.016u*92.41%))  / 100%

Questions 54-56

 

 

  

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 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85  

 

 

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