Unit 7: Electrochemistry
- What is the role of the anode in an electrolytic cell?
- A) To provide a source of electrons
- B) To serve as a reference electrode
- C) To conduct electricity between the electrodes
- D) To facilitate oxidation
- Answer: D) To facilitate oxidation
- Which of the following statements is true about the standard reduction potential of a metal?
- A) It indicates how easily a metal can be reduced
- B) It indicates how easily a metal can be oxidized
- C) It is always positive
- D) It is always negative
- Answer: A) It indicates how easily a metal can be reduced
- The electrochemical cell with the highest cell potential is:
- A) A galvanic cell with the most reactive metals
- B) A concentration cell with the highest concentration gradient
- C) An electrolytic cell with the highest current
- D) A primary cell with the highest voltage
- Answer: B) A concentration cell with the highest concentration gradient
- Which factor does not affect the standard reduction potential of a half-cell?
- A) Temperature
- B) Concentration of the reactants
- C) Nature of the electrode
- D) Presence of a catalyst
- Answer: D) Presence of a catalyst
- The main purpose of the salt bridge in an electrochemical cell is to:
- A) Facilitate the flow of electrons
- B) Maintain the electrical neutrality of the solutions
- C) Increase the rate of the reaction
- D) Measure the cell potential
- Answer: B) Maintain the electrical neutrality of the solutions
- Which of the following statements about a galvanic cell is true?
- A) The anode is positive, and the cathode is negative
- B) The anode is negative, and the cathode is positive
- C) Both electrodes are positive
- D) Both electrodes are negative
- Answer: B) The anode is negative, and the cathode is positive
- What happens to the standard cell potential if the concentration of one of the reactants in a galvanic cell is increased?
- A) The cell potential remains the same
- B) The cell potential decreases
- C) The cell potential increases
- D) The cell potential becomes zero
- Answer: C) The cell potential increases
- Which of the following describes the behavior of an electrolytic cell?
- A) It converts chemical energy into electrical energy
- B) It uses electrical energy to drive a non-spontaneous reaction
- C) It operates spontaneously without external energy
- D) It generates electricity from chemical reactions
- Answer: B) It uses electrical energy to drive a non-spontaneous reaction
- The term “EMF” stands for:
- A) Electrochemical Mole Fraction
- B) Electromotive Force
- C) Electrochemical Mass Factor
- D) Electrical Magnetic Force
- Answer: B) Electromotive Force
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