What is the role of the KNO3 salt bridge?

Answer: maintains charge neutrality by allowing ion flow between half-cells, enabling sustained current The salt bridge transports K+ toward the cathode and NO3- toward the anode to balance charge as electrons flow through the wire.

What is the role of the salt bridge in a galvanic cell?

Answer: Maintain electrical neutrality by ion flow between half-cells The salt bridge supplies spectator ions (cations to the cathode side, anions to the anode side) to balance charge so the cell can keep operating.

In standard cell-line notation, what does the double vertical bar (||) represent?

Answer: The salt bridge separating the two half-cells Single | denotes a phase boundary; double || denotes the salt bridge or porous separator between the two half-cells.

AP Chemistry · Topic 9.7

Galvanic (Voltaic) and Electrolytic Cells Practice

Part of Applications of Thermodynamics.(ENE-6.A)

Practice questions

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Sample questions

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Sample 1difficulty 1/5
$A student constructs a Zn|Zn^2+(1.0 M) || Cu^2+(1.0 M)|Cu galvanic cell with a KNO3 salt bridge and reads the voltage with a high-impedance voltmeter. Standard reduction potentials: Cu^2+/Cu = +0.34 V; Zn^2+/Zn = -0.76 V. The measured cell voltage at 25 C is 1.08 V.$
$What is the role of the KNO3 salt bridge?$
- A
  $completes the external electron pathway$
- B
  $provides Cu^2+ ions to the cathode$
- C
  $maintains charge neutrality by allowing ion flow between half-cells, enabling sustained current$
  check_circle
- D
  $increases the cell potential beyond E^o$
Why
$The salt bridge transports K+ toward the cathode and NO3- toward the anode to balance charge as electrons flow through the wire.$
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Sample 2difficulty 2/5
$What is the role of the salt bridge in a galvanic cell?$
- A
  $Maintain electrical neutrality by ion flow between half-cells$
  check_circle
- B
  $Provide chemical energy to the cell$
- C
  $Catalyze the redox reaction$
- D
  $Allow electrons to flow between half-cells$
Why
$The salt bridge supplies spectator ions (cations to the cathode side, anions to the anode side) to balance charge so the cell can keep operating.$
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Sample 3difficulty 2/5
$In standard cell-line notation, what does the double vertical bar (||) represent?$
- A
  $An electrode boundary$
- B
  $The salt bridge separating the two half-cells$
  check_circle
- C
  $An electron flow direction$
- D
  $The voltmeter$
Why
$Single | denotes a phase boundary; double || denotes the salt bridge or porous separator between the two half-cells.$
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Sample 4difficulty 2/5
$A working battery is a$
- A
  $Galvanic cell$
  check_circle
- B
  $Catalyst$
- C
  $Capacitor$
- D
  $Electrolytic cell$
Why
$Spontaneous redox produces current (galvanic). Recharging is electrolysis (forced).$
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Sample 5difficulty 2/5
$In a galvanic (voltaic) cell, electrons flow externally in which direction?$
- A
  $From anode to cathode through the salt bridge$
- B
  $Electrons do not flow externally$
- C
  $From cathode to anode through the wire$
- D
  $From anode to cathode through the wire$
  check_circle
Why
$Oxidation at the anode releases electrons, which travel through the external wire to the cathode where reduction occurs.$
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