Electrochemical Cells
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Questions and Answers

What is the primary function of an electrochemical cell?

  • To generate electricity from a chemical reaction (correct)
  • To convert electrical energy into mechanical energy
  • To store electrical energy
  • To convert mechanical energy into electrical energy

    • What type of electrochemical cell requires a source of electricity to drive a chemical reaction?

  • Voltaic cell
  • Galvanic cell
  • Battery cell
  • Electrolytic cell (correct)

    • What is the purpose of the salt bridge in an electrochemical cell?

  • To separate the two half-cells
  • To allow ions to flow between the two half-cells (correct)
  • To provide ions for the chemical reaction
  • To carry electrons from the anode to the cathode

    • What is a characteristic of metals used as electrodes in an electrochemical cell?

    <p>They are highly reactive</p> Signup and view all the answers

    What is the name of an electrochemical cell that generates electricity from a spontaneous redox reaction?

    <p>Galvanic cell</p> Signup and view all the answers

    What is the function of the anode and cathode in an electrochemical cell?

    <p>To facilitate the flow of electrons between the two half-cells</p> Signup and view all the answers

    What is the purpose of the electrolyte solution in an electrochemical cell?

    <p>To provide ions or charged particles for the chemical reaction</p> Signup and view all the answers

    What is the direction of electron flow in an electrochemical cell?

    <p>From the anode to the cathode</p> Signup and view all the answers

    What is the reaction that occurs at the anode in an electrochemical cell?

    <p>Oxidation reaction</p> Signup and view all the answers

    What is the purpose of the salt bridge in an electrochemical cell?

    <p>To connect the half cells</p> Signup and view all the answers

    What is the electrochemical potential of a cell a measure of?

    <p>The energy the cell can produce</p> Signup and view all the answers

    How do you determine the electrochemical potential of a cell?

    <p>Subtract the electrochemical potential of the anode from the cathode</p> Signup and view all the answers

    What is the anode in a Galvanic cell?

    <p>Negative electrode</p> Signup and view all the answers

    What is the reaction that occurs at the cathode in an electrochemical cell?

    <p>Reduction reaction</p> Signup and view all the answers

    What is the significance of the double line in cell notation?

    <p>It represents the salt bridge that connects the half cells</p> Signup and view all the answers

    Study Notes

    Electrochemical Cells

    • An electrochemical cell is a device that generates electricity from a chemical reaction or uses electrical energy to drive a chemical reaction.
    • Electrochemical cells can be classified into two types: voltaic (Galvanic) cells, which generate electricity from a spontaneous redox reaction, and electrolytic cells, which require a source of electricity to drive a chemical reaction.

    Components of an Electrochemical Cell

    • The main components of an electrochemical cell are the anode, the cathode, and the electrolyte.
    • The anode and cathode are separated into two half-cells and connected by a metal wire.
    • A salt bridge allows ions to flow between the two half-cells to complete the electrical circuit.
    • The electrolyte solution provides ions or charged particles for the chemical reaction.

    Anode and Cathode

    • The anode and cathode are electrodes, typically made of metal conductors like Zinc and Iron.
    • In a voltaic cell, the anode is negative and the cathode is positive, while in an electrolytic cell, the anode is positive and the cathode is negative.
    • The anode is the site of oxidation, where electrons are lost, and the cathode is the site of reduction, where electrons are gained.

    Half-Cell Reactions

    • The reaction at the anode is an oxidation reaction, represented by the equation: Ox + ne- → Red
    • The reaction at the cathode is a reduction reaction, represented by the equation: Ox + ne- → Red
    • Using Zinc as the anode, the anode reaction is: Zn → Zn2+ + 2e-
    • Using copper as the cathode, the cathode reaction is: Cu2+ + 2e- → Cu

    Cell Notation

    • Cell notation is a simplified way to represent the two half-reactions.
    • The single lines represent a change between the solid and liquid or aqueous phase, and the double line represents the salt bridge that connects the half-cells.
    • The anode is always written on the left of the double lines, and the cathode is always written on the right.

    Electrochemical Potential (E cell)

    • E cell is shorthand for the electrochemical potential of the cell, which is a measure of the energy the cell can produce.
    • The electrochemical potential is a result of the difference in the number of charges of the anode and the cathode.
    • The electrochemical potential can be calculated by finding the difference in the electrochemical potential of the cathode and anode.

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    Description

    Learn about electrochemical cells, including voltaic and electrolytic cells, and how they generate electricity or drive chemical reactions.

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