Question 1

In a galvanic cell composed of 1.0 M Al(NO$$_3$$)$$_3$$ and 1.0 M Pb(NO$$_3$$)$$_2$$, which electrode acts as the anode?

Accepted Answer

Al electrode

Question 2

Given the cell notation: $$\mathrm{Al} | \mathrm{Al}^{3+} || \mathrm{Pb}^{2+} | \mathrm{Pb}$$, what is the overall cell reaction?

Accepted Answer

$$\mathrm{Al} + 3\mathrm{Pb}^{2+} \rightarrow \mathrm{Al}^{3+} + 3\mathrm{Pb}$$

Question 3

If the standard cell potential for the Al/Pb cell is 1.53 V, which of the following equations correctly represents the calculation of the cell potential?

Accepted Answer

$$E^\circ_{cell} = E^\circ_{cathode} - E^\circ_{anode}$$

Question 4

In a galvanic cell, electrons flow through the external wire from:

Accepted Answer

Anode to cathode

Question 5

What happens to the mass of the aluminum electrode as the cell operates?

Accepted Answer

It decreases

Question 6

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

Accepted Answer

It maintains electrical neutrality by allowing ion migration

Question 7

In the cell $$\mathrm{Mg} | \mathrm{Mg}^{2+} || \mathrm{Fe}^{2+} | \mathrm{Fe}$$, which species is being reduced?

Accepted Answer

$$\mathrm{Fe}^{2+}$$

Question 8

A student sets up a galvanic cell with $$\mathrm{Zn}$$ and $$\mathrm{Ag}$$ electrodes. If the standard reduction potentials are $$E^\circ_{Ag^+/Ag} = 0.80\ \mathrm{V}$$ and $$E^\circ_{Zn$$^{2+}$$/Zn} = -0.76\ \mathrm{V}$$, what is the standard cell potential?

Accepted Answer

$$1.56\ \mathrm{V}$$

Question 9

In the cell $$\mathrm{Fe} | \mathrm{Fe}^{2+} || \mathrm{Mg}^{2+} | \mathrm{Mg}$$, what is happening to the concentration of $$\mathrm{Fe}^{2+}$$ ions as the cell operates?

Accepted Answer

It is increasing

Question 10

Which of the following line notations correctly represents a cell where nickel is oxidized and cobalt is reduced?

Accepted Answer

$$\mathrm{Ni} | \mathrm{Ni}^{2+} || \mathrm{Co}^{2+} | \mathrm{Co}$$

Question 11

If the standard cell potential for a cell is positive, what does this indicate about the spontaneity of the cell reaction?

Accepted Answer

The reaction is spontaneous

Question 12

In a galvanic cell, which electrode is the site of reduction?

Accepted Answer

Cathode

Question 13

A cell is constructed with $$\mathrm{Zn}$$ and $$\mathrm{Cu}$$ electrodes. If $$\mathrm{Zn} is $$oxidized, what is the half-cell reaction at the anode?

Accepted Answer

$$\mathrm{Zn} \rightarrow \mathrm{Zn}^{2+} + 2e^-$$

Question 14

Which of the following statements about the salt bridge in a galvanic cell is FALSE?

Accepted Answer

It is the path for electron flow between electrodes

Question 15

In the cell $$\mathrm{Mg} | \mathrm{Mg}^{2+} || \mathrm{Fe}^{2+} | \mathrm{Fe}$$, which electrode is increasing in mass?

Accepted Answer

Fe electrode

Question 16

A student observes that the silver electrode in a $$\mathrm{Zn} | \mathrm{Zn}^{2+} || \mathrm{Ag}^{+} | \mathrm{Ag}$$ cell is increasing in mass. What process is occurring at the silver electrode?

Accepted Answer

Reduction of Ag$$^+$$

Question 17

Which of the following best explains why the concentration of $$\mathrm{Al}^{3+}$$ ions increases in the Al/Pb cell as it operates?

Accepted Answer

Al metal is oxidized at the anode, producing Al$$^{3+}$$ ions

Question 18

In a galvanic cell, what is the direction of cation flow in the salt bridge?

Accepted Answer

From anode to cathode

Question 19

Which of the following is the correct net ionic equation for the cell $$\mathrm{Zn} | \mathrm{Zn}^{2+} || \mathrm{Ag}^{+} | \mathrm{Ag}$$?

Accepted Answer

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

Galvanic (Voltaic) Cells and Electrochemistry Study Notes

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