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Question Bank: Electrochemistry

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FAQs on Question Bank: Electrochemistry

1. What is electrochemistry?
Ans. Electrochemistry is a branch of chemistry that deals with the study of the relationship between electricity and chemical reactions. It involves the transfer of electrons between different substances, and the conversion of chemical energy into electrical energy or vice versa.
2. What are electrochemical cells?
Ans. Electrochemical cells are devices that convert chemical energy into electrical energy through redox reactions. They consist of two electrodes, an anode (where oxidation occurs) and a cathode (where reduction occurs), connected by an electrolyte. Examples of electrochemical cells include batteries and fuel cells.
3. How does a battery work?
Ans. A battery works by utilizing the chemical reactions that occur between its two electrodes and the electrolyte. During discharge, the anode undergoes oxidation, releasing electrons that flow through an external circuit to the cathode, where reduction occurs. This flow of electrons generates an electric current.
4. What is the Nernst equation?
Ans. The Nernst equation is a mathematical equation that relates the equilibrium potential of an electrochemical cell to the concentrations of reactants and products involved in the cell's redox reaction. It is given by Ecell = E°cell - (RT/nF)ln(Q), where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred, F is the Faraday constant, and Q is the reaction quotient.
5. What is the significance of electrode potential?
Ans. The electrode potential is a measure of the tendency of an electrode to gain or lose electrons. It determines the direction and magnitude of the flow of electrons in an electrochemical cell. The sign of the electrode potential indicates whether the electrode acts as an anode (negative potential) or a cathode (positive potential).
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