Electrochemical cells and cell diagrams Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. A cell is made from Mg²⁺/Mg (E° = −2.37 V) and Ag⁺/Ag (E° = +0.80 V). What is E°cell?
- A. −1.57 V
- B. +1.57 V
- C. +3.17 V
- D. +6.34 V
2. In a cell diagram, how are Fe²⁺(aq) and Fe³⁺(aq) in the same half-cell written?
- A. Fe²⁺(aq) | Fe³⁺(aq)
- B. Fe²⁺(aq) || Fe³⁺(aq)
- C. Fe²⁺(aq), Fe³⁺(aq)
- D. Fe²⁺(aq) / Fe³⁺(aq)
3. Which set of conditions defines a standard electrode potential?
- A. 1.00 mol dm⁻³, 273 K, 100 kPa
- B. 1.00 mol dm⁻³, 298 K, 100 kPa
- C. 0.100 mol dm⁻³, 298 K, 100 kPa
- D. 1.00 mol dm⁻³, 298 K, 10 kPa
4. What is the role of the platinum in the standard hydrogen electrode?
- A. It reacts with H⁺ ions
- B. It conducts electrons and provides a surface for the H⁺/H₂ equilibrium
- C. It lowers the E° of the electrode
- D. It dissolves to form Pt²⁺
5. A student measures a Cu²⁺/Cu electrode in 0.0100 mol dm⁻³ Cu²⁺ and gets +0.28 V rather than +0.34 V. Why?
- A. The voltmeter has too high a resistance
- B. The equilibrium Cu²⁺ + 2e⁻ ⇌ Cu shifted left, so the electrode is less positive
- C. Platinum was used as the electrode
- D. The salt bridge was too long