Question 1

Which of the following statements correctly describes the function of the salt bridge in a galvanic cell?

Accepted Answer

It provides a path for ions to move between half-cells, maintaining electrical neutrality.

Question 2

In a galvanic cell composed of a zinc electrode in ZnSO$$_4$$ solution and a copper electrode in CuSO$$_4$$ solution, which of the following correctly identifies the anode and the process occurring there?

Accepted Answer

Zinc is the anode, and oxidation occurs there.

Question 3

A student sets up a galvanic cell with a silver electrode in AgNO$$_3$$ solution and a copper electrode in CuSO$$_4$$ solution. Which half-reaction occurs at the cathode?

Accepted Answer

$$\mathrm{Ag^+ + e^- \rightarrow Ag}$$

Question 4

Which of the following best explains why no reaction occurs when a copper strip is placed in a solution of zinc sulfate?

Accepted Answer

Copper is less reactive than zinc and cannot reduce zinc ions.

Question 5

In a galvanic cell, electrons flow:

Accepted Answer

From the anode to the cathode through the wire.

Question 6

A galvanic cell is constructed using a magnesium electrode in MgSO$$_4$$ solution and a silver electrode in AgNO$$_3$$ solution. Given that the standard reduction potential for Ag$$^+ is $$higher than for Mg$$^{2+}$$, which statement is correct?

Accepted Answer

Silver ions will be reduced at the cathode.

Question 7

Which of the following equations correctly represents the overall cell reaction for a galvanic cell with zinc and copper electrodes?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$ + Zn \rightarrow Cu + Zn$$^{2+}$$}$$

Question 8

During the operation of a galvanic cell, what is the primary role of the external wire connecting the two electrodes?

Accepted Answer

To provide a path for electrons to flow from the anode to the cathode.

Question 9

If the potential difference between two half-cells is negative, what will happen when the circuit is completed?

Accepted Answer

No spontaneous reaction will occur.

Question 10

In a silver-copper galvanic cell, which of the following statements about ion movement through the salt bridge is correct?

Accepted Answer

Anions move from the cathode to the anode.

Question 11

A battery in a flashlight is an example of a practical application of which chemical principle?

Accepted Answer

Spontaneous redox reactions in a galvanic cell.

Question 12

Which of the following best describes the charge changes at the electrodes during the operation of a galvanic cell?

Accepted Answer

The anode becomes negatively charged and the cathode becomes positively charged.

Question 13

A student wants to increase the voltage of a zinc-copper galvanic cell. Which of the following changes would most likely achieve this?

Accepted Answer

Increase the concentration of Cu$$^{2+}$$ ions.

Question 14

Which of the following is a necessary condition for a redox reaction to produce an electric current in a galvanic cell?

Accepted Answer

There must be a positive potential difference between the half-cells.

Question 15

In a galvanic cell, which of the following statements about the direction of electron flow and the processes at the electrodes is correct?

Accepted Answer

Electrons flow from the anode to the cathode; oxidation occurs at the anode.

Question 16

A galvanic cell is set up with a nickel electrode in NiSO$$_4$$ solution and a copper electrode in CuSO$$_4$$ solution. The standard reduction potential for Cu$$^{2+} is $$higher than for Ni$$^{2+}. $$Which metal will be deposited on its electrode as the cell operates?

Accepted Answer

Copper will be deposited on the copper electrode.

Question 17

Which of the following best explains why the salt bridge is essential for the continuous operation of a galvanic cell?

Accepted Answer

It prevents the buildup of charge in the half-cells by allowing ion migration.

Question 18

In a galvanic cell, which of the following correctly describes the movement of cations and anions through the salt bridge?

Accepted Answer

Cations move from the anode to the cathode; anions move from the cathode to the anode.

Question 19

A galvanic cell is constructed with a copper electrode in CuSO$$_4$$ solution and a silver electrode in AgNO$$_3$$ solution. If the cell potential is measured to be 0.46 V, what does this value represent?

Accepted Answer

The maximum energy per unit charge that can be obtained from the spontaneous redox reaction.

Galvanic Cells and the Principles of Electrochemistry

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