June 2014 Chemistry Regents #62-65

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Question 62-65

 

 

Base your answers to questions 62 through 65 on the information below and on your knowledge of chemistry.

An operating voltaic cell has zinc and iron electrodes. The cell and the unbalanced ionic equation representing the reaction that occurs in the cell are shown below.

62 Identify the subatomic particles that flow through the wire as the cell operates. [I]

Answer--> electrons

63 Balance the equation in your answer booklet for the redox reaction that occurs in this cell, using the smallest whole-number coefficients.

____Zn(s)  +  _____Fe3+(aq)==>  ____Zn2+(aq)   +  ____Fe(s)

Answer--> __3__Zn(s) + __2__Fe3+(aq)==> __3__Zn2+(aq) + __2__Fe(s)

64 Identify one metal from table J that is more easily oxidized than Zn.

Answer-->a metal above Zn....Mn,Ti, Al, Mg, Na, Ca, Sr, Ba, Cs, K, Rb, Li

65 Explain, in terms of Zn atoms and Zn ions, why the mass of the Zn electrode  decreases as the cell operates.

Answer--> the Zn atoms become Zn2+

on to Questions 66-69

 

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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