June 2017 Chemistry Regents #77-80

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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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

 

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Question 77-80

 

 

Base your answers to questions 77 through 80 on the information below and on your knowledge of chemistry.

A student constructs an electrochemical cell during a laboratory investigation. When the switch is closed, electrons flow through the external circuit. The diagram and ionic equation below represent this cell and the reaction that occurs.

77 State the form of energy that is converted to electrical energy in the operating cell. [1]

Answer-->  chemical

78 State, in terms of the Cu(s) electrode and the Zn(s) electrode, the direction of electron flow in the external circuit when the cell operates. [1]

Answer-->  Zn to Cu

79 Write a balanced equation for the half-reaction that occurs in the Cu half-cell when the cell operates. [1]

Answer-->  Cu2+ 2e- --> Cu

80 State what happens to the mass of the Cu electrode and the mass of the Zn electrode in the operating cell. [1]

Answer--> 

Cu increase in mass (it's a product)

Zn decreases (it's a reactant)

on to Questions 81-82

 

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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 
 

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