Unit 7: Electrochemistry
- What does the term “Faraday’s constant” refer to?
- A) The charge of one mole of electrons
- B) The energy required to deposit one mole of metal
- C) The potential difference in a cell
- D) The current through a cell
- Answer: A) The charge of one mole of electrons
- Which type of electrode is commonly used in a concentration cell?
- A) Standard hydrogen electrode
- B) Calomel electrode
- C) Same electrode material with different concentrations
- D) Platinum electrode
- Answer: C) Same electrode material with different concentrations
- The cell potential of an electrochemical cell can be affected by:
- A) The nature of the electrodes
- B) The temperature of the cell
- C) The concentration of ions in the cell
- D) All of the above
- Answer: D) All of the above
- Which of the following is an example of a primary cell?
- A) Rechargeable battery
- B) Lead-acid battery
- C) Dry cell
- D) Nickel-cadmium battery
- Answer: C) Dry cell
- In an electrochemical cell, the term “E_cell” refers to:
- A) The standard cell potential
- B) The electrode potential at standard conditions
- C) The cell potential under non-standard conditions
- D) The electrode potential of a single electrode
- Answer: C) The cell potential under non-standard conditions
- What is the role of the electrolyte in an electrochemical cell?
- A) To conduct electricity between the electrodes
- B) To increase the temperature of the cell
- C) To separate the two electrodes
- D) To supply electrical energy
- Answer: A) To conduct electricity between the electrodes
- What determines the direction of electron flow in an electrochemical cell?
- A) The concentration of the solutions
- B) The standard electrode potentials
- C) The temperature of the cell
- D) The type of electrolyte used
- Answer: B) The standard electrode potentials
- Which of the following substances would make the best electrolyte?
- A) A non-metallic solid
- B) A gas
- C) A salt dissolved in water
- D) An organic solvent
- Answer: C) A salt dissolved in water
- In an electrochemical cell, what does the term “electrochemical potential” refer to?
- A) The ability of a substance to be oxidized
- B) The energy required to complete a reaction
- C) The ability of a substance to gain or lose electrons
- D) The amount of energy released during a reaction
- Answer: C) The ability of a substance to gain or lose electrons
- The “cell potential” of an electrochemical cell is also known as:
- A) Electrolytic potential
- B) Electromotive force (EMF)
- C) Reduction potential
- D) Oxidation potential
- Answer: B) Electromotive force (EMF)
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