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Voltammetry quiz

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  • What is the main function of a galvanic or voltaic cell?
    A galvanic or voltaic cell generates electricity through spontaneous chemical reactions, functioning like a battery.
  • Where does oxidation occur in a galvanic cell?
    Oxidation occurs at the anode, which is the negative electrode in a galvanic cell.
  • What happens at the cathode in a voltaic cell?
    Reduction occurs at the cathode, which is the positive electrode, where electrons are gained.
  • In which direction do electrons flow in a galvanic cell?
    Electrons flow from the anode to the cathode.
  • What is the purpose of the salt bridge in a voltaic cell?
    The salt bridge allows ions to move between the two half-cells, maintaining electrical neutrality and completing the circuit.
  • What types of ions are typically found in the salt bridge?
    Neutral ions such as sodium (Na+), chloride (Cl-), or nitrate (NO3-) are typically found in the salt bridge.
  • Why do negative ions move toward the anode through the salt bridge?
    Negative ions move toward the anode to neutralize the buildup of positive ions produced by oxidation at the anode.
  • What happens to the mass of the anode over time in a galvanic cell?
    The anode loses mass over time as it dissolves due to the loss of electrons.
  • How does the cathode change during the operation of a voltaic cell?
    The cathode gains mass as positive ions in solution plate out onto its surface.
  • What periodic trend is important for electron loss at the anode?
    Low ionization energy is important for the anode to lose electrons easily.
  • What periodic trend is important for electron gain at the cathode?
    High electron affinity is important for the cathode to attract and gain electrons.
  • What does a higher standard cell potential indicate?
    A higher standard cell potential indicates a greater likelihood of reduction and a stronger oxidizing agent.
  • What does a lower standard cell potential indicate?
    A lower standard cell potential indicates a greater likelihood of oxidation and a stronger reducing agent.
  • What happens to a galvanic cell when it is fully discharged?
    When fully discharged, the cell reaches equilibrium and becomes a dead battery.
  • Why is it important to keep the concentration of positive ions low at the anode?
    Keeping the concentration of positive ions low at the anode helps maintain a higher voltage and encourages electron flow toward the cathode.