January 2013 Chemistry Regents #70-72

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  Base your answers to questions 70 through 72 on the information below.

Metallic elements are obtained from their ores by reduction. Some metals, such as zinc, lead, iron, and copper, can be obtained by heating their oxides with carbon. More active metals, such as aluminum, magnesium, and sodium, can not be reduced by carbon. These metals can be obtained by the electrolysis of their molten (melted) ores. The diagram below represents an incomplete cell for the electrolysis of molten NaCl. The equation below represents the reaction that occurs when the completed cell operates.

70 Identify the component required for the electrolysis of molten NaCl that is missing from the cell diagram. [1]

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source of electrical energy

battery

71 Identify one metal from the passage that is more active than carbon and one metal from the passage that is less active than carbon. [1]

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More active than carbon:  aluminum  Mg  Na

Less active than carbon:  zinc  Pb  Fe  copper

72 Write a balanced half-reaction equation for the reduction of the iron ions in iron(III) oxide to iron atoms. [1]

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Fe3+ + 3e- → Fe

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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