Q: In a standard cell, the cell potential $$E^\circ_{\text{cell}} is $$calculated using the following equation. Which option correctly represents this equation?

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

Q: Which of the following is the correct Nernst equation for calculating the cell potential under nonstandard conditions?

$$E_{\text{cell}} = E^\circ_{\text{cell}} - \dfrac{0.0592\ \mathrm{V}}{n} \log Q$$

Question 1

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

Accepted Answer

It allows the flow of ions to balance charge and maintain electrical neutrality.

Question 2

A student is asked to balance the following redox reaction in acidic solution: $$\mathrm{$$MnO_4$$^-} + \mathrm{Fe$$^{2+}$$} \rightarrow \mathrm{Mn$$^{2+}$$} + \mathrm{Fe$$^{3+}$$}. $$Which is the correct first step according to the half-reaction method?

Accepted Answer

Write the oxidation and reduction half-reactions separately.

Question 3

Which of the following statements about electrolytic cells is correct?

Accepted Answer

They require an external electrical current to drive a nonspontaneous reaction.

Question 4

In a standard cell, the cell potential $$E^\circ_{	ext{cell}} is $$calculated using the following equation. Which option correctly represents this equation?

Accepted Answer

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

Question 5

Which of the following changes will increase the cell potential of a concentration cell?

Accepted Answer

Increasing the concentration difference between the two half-cells.

Question 6

A Daniell cell is constructed using zinc and copper electrodes. Which statement about the flow of electrons is correct?

Accepted Answer

Electrons flow from the zinc electrode (anode) to the copper electrode (cathode).

Question 7

Which of the following is NOT a method for preventing the corrosion of iron?

Accepted Answer

Increasing the exposure of iron to acidic environments.

Question 8

Given the following standard reduction potentials: $$E^\circ(\mathrm{Ag^+/Ag}) = +0.80\ \mathrm{V}$$ and $$E^\circ(\mathrm{Cu$$^{2+}$$/Cu}) = +0.34\ \mathrm{V}$$, which metal will be oxidized in a voltaic cell constructed from these two half-cells?

Accepted Answer

Copper will be oxidized.

Question 9

Which of the following best describes the purpose of electrodes in an electrochemical cell?

Accepted Answer

They are conductive surfaces through which electrons enter or leave the half-cells.

Question 10

A lead-acid battery is commonly used in automobiles. Which statement about its operation is correct?

Accepted Answer

It uses a solid lead anode and a lead dioxide cathode in sulfuric acid.

Question 11

Which of the following is the correct Nernst equation for calculating the cell potential under nonstandard conditions?

Accepted Answer

$$E_{	ext{cell}} = E^\circ_{	ext{cell}} - \dfrac{0.0592\ \mathrm{V}}{n} \log Q$$

Question 12

During the electrolysis of molten sodium chloride, what is produced at the cathode?

Accepted Answer

Sodium metal

Question 13

Which of the following best explains why corrosion of iron is accelerated in the presence of salt water?

Accepted Answer

Salt water acts as an electrolyte, increasing the conductivity and rate of redox reactions.

Question 14

Which of the following is true about the anode in both voltaic and electrolytic cells?

Accepted Answer

Oxidation always occurs at the anode.

Question 15

A voltaic cell is constructed with the following cell notation: $$\mathrm{Zn(s) \ | \ Zn$$^{2+}$$(aq) \ |\ | \ Cu$$^{2+}$$(aq) \ | \ Cu(s)}. $$Which half-reaction occurs at the cathode?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$ + 2e^- \rightarrow Cu(s)}$$

Question 16

Which of the following is a correct description of a sacrificial anode used to prevent corrosion?

Accepted Answer

A metal that is more easily oxidized than iron and corrodes instead of the protected metal.

Question 17

Which of the following is the correct relationship between cell potential, free energy, and the equilibrium constant?

Accepted Answer

$$\Delta G^\circ = -nFE^\circ_{	ext{cell}}$$

Question 18

Which of the following best describes the main difference between a primary and a secondary battery?

Accepted Answer

A secondary battery can be recharged; a primary battery cannot.

Question 19

Which of the following is the correct cell notation for a cell where silver is reduced and copper is oxidized?

Accepted Answer

$$\mathrm{Cu(s) \ | \ Cu$$^{2+}$$(aq) \ |\ | \ Ag^+(aq) \ | \ Ag(s)}$$

Electrochemistry: Terms, Definitions, Tables, and Formulas (Chapter 20 Study Notes)

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