August 2010 Chemistry Regents #64-66

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Base your answers to questions 64 through 66 on the information below.

The diagram below represents an operating voltaic cell at 298 K and 1.0 atmosphere in a laboratory investigation. The reaction occurring in the cell is represented by the balanced ionic equation below.

64 Identify the anode in this cell. [1]

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NOTE= The anode is element that is higher on Table J. Also, electrodes are solids. NO IONS!!!

Ni(s)  or   the nickel electrode

Note: Do not allow credit for Ni2+(aq).

65 Determine the total number of moles of Ni2+(aq) ions produced when 4.0 moles of Ag+(aq) ions completely react in this cell. [1]

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NOTE=look at the balanced reaction for the mole ratio for the two ions

(4.0mols Ag+ / 2Ag+)= x mol/ 1Ni2+

answer =2.0 moles    

66 Write a balanced half-reaction equation for the reduction that occurs in this cell. [1]

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Reduction=Charge goes down electrons on the more positive side

Ag+ + e- ==>Ag

2Ag+ + 2e-  ==>2Ag

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 
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