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Constructed Response . Topic 11: Redox and Electrochemistry

Set F: Voltaic cell, salt bridge, anode

Base your answers to questions 18 and 20 on the diagram of a voltaic cell and the balance ionic

equation below.

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18. Explain the function of the salt bridge 18.

in the voltaic cell.

19. What is the total number of moles of 19.

electrons needed to completely reduce

2+(

6.0 moles of Cu aq) ions?

20. Identify the anode in the voltaic cell. 20.

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Set G: Electrolytic cell, half-reaction equation,

Base your answers to questions 21 through 23 on the diagram and balance equation below, which

represents the electrolysis of molten NaCl.

(+) (-) Switch
Battery

Positive Negative

electrode Cl- electrode
(anode)

Na+ (cathode)

Molten NaCl (810 C)
o
2NaCl ------ > Cl2 + 2Na

21. Write the b alance half-reaction for the reduction 21.
that occurs in this electrolytic cell.

22. What is the purpose of the battery in this 22.
electrolytic cell?

23. When the s witch is closed, which electrode 23.
will attract the sodium ions?

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