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AP Chemistry 9.9 A Explain Whether an Electrochemical Cell Is Thermodynamically Favored Based on Its Standard Cell Potential and Questions

Practice AP Chemistry questions on calculating standard cell potential from half-reactions and relating its sign to ΔG° and favorability.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Calculate standard cell potential from oxidation and reduction half-reaction potentials with correct signs.
  • Write balanced overall redox equations, identify electrons transferred, and use stoichiometry with cell potentials.
  • Relate cell-potential sign to thermodynamic favorability and calculate ΔG° = −nFE° with correct units.

AP Chemistry 9.9 A Explain Whether an Electrochemical Cell Is Thermodynamically Favored Based on Its Standard Cell Potential and Questions question 1

[Maximum number: 1]

A scientist constructs a galvanic cell as shown in the diagram. As the cell operates, the Zn(s)\mathrm{Zn}(s) electrode increases in mass and the Al(s)\mathrm{Al}(s) electrode decreases in mass. A data table with the standard reduction potentials for the substances follows the diagram.

Figure for Question AP Chemistry 9.9 A Explain Whether an Electrochemical Cell Is Thermodynamically Favored Based on Its Standard Cell Potential and Questions question 1 — AP Chemistry
Table for Question AP Chemistry 9.9 A Explain Whether an Electrochemical Cell Is Thermodynamically Favored Based on Its Standard Cell Potential and Questions question 1 — AP Chemistry
Table for Question AP Chemistry 9.9 A Explain Whether an Electrochemical Cell Is Thermodynamically Favored Based on Its Standard Cell Potential and Questions question 1 — AP Chemistry

The standard Zn/Al cell has a value of Ecell ∘E_{\text {cell }}^{\circ} equal to 0.90 V. The scientist needs a galvanic cell that produces a greater voltage. The scientist has access to the chemical systems in the table.

If the scientist uses the Zn half-cell and one of the other options from the table, what is the MAXIMUM voltage that could be generated at standard conditions?

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