August 2016 Chemistry Regents #74-76

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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 54-55 Questions 56-59 Questions 60-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-76  Questions 77-80  Questions 81-85

 

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Question 74-76

 

 

Base your answers to questions 74 through 76 on the information below and on your knowledge of chemistry.

One type of voltaic cell, called a mercury battery, uses zinc and mercury(II) oxide to generate an electric current. Mercury batteries were used because of their miniature size, even though mercury is toxic. The overall reaction for a mercury battery is given in the equation below.

74 Determine the change in the oxidation number of zinc during the operation of the cell. [1]

Answer-->From 0 to +2

75 Compare the number of moles of electrons lost to the number of moles of electrons gained during the reaction. [1]

Answer-->The number of moles of electrons lost is equal to the number of moles of electrons gained.

76 Using information in the passage, state one risk and one benefit of using a mercury battery. [1]

Answer-->Risk: harmful to humans
Benefit: producing electricity

on to Questions 77-80

 

 

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 54-55 Questions 56-59 Questions 60-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-76  Questions 77-80  Questions 81-85

 

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