January 2017 Chemistry Regents #80-82

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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

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  

 

 

 

 

 #80-82
  

The diagram and balanced ionic equation below represent two half-cells connected to produce an operating voltaic cell in a laboratory investigation. The half-cells are connected by a salt bridge.

80 Determine the oxidation number of nitrogen in the negative ion in the aqueous solutions. [1]

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+5

81 State the purpose of the salt bridge in this voltaic cell. [1]

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ion flow

82 Explain, in terms of atoms and ions, why the mass of the Mg(s) electrode decreases as the cell operates. [1]

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Atoms become aqueous Mg2+ ions
  

on to Questions 83-85

  

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