Unit 7: Electrochemistry
- Which type of electrode is used as a reference electrode in electrochemical cells?
- A) Calomel electrode
- B) Silver-silver chloride electrode
- C) Standard hydrogen electrode
- D) Platinum electrode
- Answer: C) Standard hydrogen electrode
- In a concentration cell, the cell potential is a result of:
- A) The difference in electrode materials
- B) The difference in temperature
- C) The difference in ion concentrations
- D) The difference in the size of the electrodes
- Answer: C) The difference in ion concentrations
- The E cell of an electrochemical cell can be determined by:
- A) Adding the standard reduction potentials of the half-reactions
- B) Subtracting the standard reduction potentials of the half-reactions
- C) Multiplying the standard reduction potentials of the half-reactions
- D) Dividing the standard reduction potentials of the half-reactions
- Answer: B) Subtracting the standard reduction potentials of the half-reactions
- In an electrolytic cell, what drives the non-spontaneous reactions?
- A) Electrical energy
- B) Chemical energy
- C) Thermal energy
- D) Mechanical energy
- Answer: A) Electrical energy
- What is the relation between Gibbs free energy change and cell potential?
- A) ΔG = nFE
- B) ΔG = -nFE
- C) ΔG = nE/F
- D) ΔG = -n/E
- Answer: B) ΔG = -nFE
- Which of the following describes a concentration cell?
- A) A cell with identical electrodes but different concentrations of electrolyte
- B) A cell with different types of electrodes and the same concentration of electrolyte
- C) A cell with no electrolyte
- D) A cell that operates at a constant temperature
- Answer: A) A cell with identical electrodes but different concentrations of electrolyte
- The term “overpotential” in electrolysis refers to:
- A) The extra voltage required beyond the theoretical value
- B) The decrease in voltage during electrolysis
- C) The maximum voltage that can be applied
- D) The voltage drop due to resistance
- Answer: A) The extra voltage required beyond the theoretical value
- What is the purpose of using a reference electrode in electrochemical measurements?
- A) To measure the cell potential
- B) To provide a stable reference potential
- C) To supply electrons
- D) To balance the cell
- Answer: B) To provide a stable reference potential
- What is the relationship between the cell potential and the Gibbs free energy for a reaction?
- A) ΔG = -nFE
- B) ΔG = nFE
- C) ΔG = E/nF
- D) ΔG = nF/E
- Answer: A) ΔG = -nFE
- In an electrochemical cell, the anode is:
- A) The site of reduction
- B) The site of oxidation
- C) The electrode with the highest potential
- D) The electrode with the lowest potential
- Answer: B) The site of oxidation
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