Important Definitions of Electrochemistry | Class XII

  • Anode: Electrode in an electrochemical cell on which the oxidation reaction occurs.
  • Cathode: Electrode in an electrochemical cell on which the reduction reaction occurs
  • Electrochemistry: A field of chemistry that focuses on the interchange between electrical and chemical energy
  • Electricity: Flow of electrons over a wire that is affected by the presence and flow of electric charge.
  • Electrolysis: The decomposition of a substance by means of electric current. This method pushes a redox reaction toward the non-spontaneous side.
  • Electrolytic cell: Electrochemical cell that is being pushed toward the non-spontaneous direction by electrolysis.
  • Electromotive force, EMF (or cell potential): Difference of potential energy of electrons between the two electrodes.
  • Oxidation number: Charge on an atom if shared electrons where assigned to the more electronegative atom.
  • Oxidation: Lose of electrons, can occur only in combination with reduction. [remember: Oxidation Is Loss, Reduction Is Gain = OIL RIG]
  • Reduction: Gain of electrons, can occur only in combination with oxidation. [remember: OIL RIG]
  • Redox reaction: Shorthand for reduction-oxidation reaction.
  • Voltaic cell or galvanic cell: An electrochemical cell that uses redox reaction to produce electricity spontaneously.

  • Cell potential: The difference between the electrode potentials of the two half cells.
  • Corrosion: The process of slowly eating away of the metal due to attack of the atmospheric gases on the surface of the metal resulting into the formatin of compounds such as oxides, sulphides, carbonates etc.

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