Chemistry: Matter and Change

Section 1: Voltaic Cells

Self Check Quizzes

1
Which of the following must be true of a salt bridge?

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A)Ions can move through the salt bridge.
B)The salt bridge must prevent the flow of charged particles.
C)The solutions joined by the salt bridge can mix freely.
D)The tube of the salt bridge must remain open
2
A voltaic cell consists of a standard hydrogen electrode connected by a salt bridge and a wire to an electrode consisting of a strip of Cd metal dipping into a 1M solution of Cd(NO3)2. When the cell produces a current, the electrons flow through the wire from the _________ electrode to the ________ electrode. In this cell, the _______ electrode acts as the cathode.
A)Cd, H2, Cd
B)H2, Cd, Cd
C)H2, Cd, H2
D)Cd, H2, H2
3
Under standard conditions, which of the following is the net reaction that occurs in the cell?

Cd|Cd2+ || Cu2+|Cu
A)Cu + Cd2+ → Cd + Cu2+
B)Cu + Cd → Cu2+ + Cd2+
C)Cu2+ + Cd2+ → Cu + Cd
D)Cu2+ + Cd → Cu + Cd2+
4
Explain why current will not flow in the cell shown.

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A)Copper is not a good conductor.
B)There is no salt bridge to move ions.
C)There is no potential between zinc and copper.
D)There is no load on the wire.
5
When compared to the standard hydrogen electrode, zinc has a reduction potential of -0.762 volts and copper a reduction potential of + 0.342 volts. What is the reduction potential when zinc and copper are connected to one another?

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A)+0.420 volts
B)-0.420 volts
C)+1.104 volts
D)-1.104 volts
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