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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Electrochemistry Glossary

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                     Electrochemistry: The study of chemical changes produced by electricity and generation of electricity by chemical changes.

                     Electrochemical Reaction (Electrolysis): A reaction that takes place to generate electricity or a decomposition reaction carried out by electricity.

                     Electrolytic Cell: A device to carry out electrolysis.

                     Electrochemical Cell: A device to generate electricity.

                     Electrode: A metal or carbon rod by which an electric current passes into or out of a cell.

                     Anode: An electrode at which oxidation takes place.

                     Cathode: An electrode at which reduction takes place.

                     Storage Cell or Accumulators: An electrochemical cell that can be recharged. Example: Lead storage battery.

                     Reactivity Series of Metals: Metals are arranged in the decreasing order of reactivity or increasing order of electrode potential.

                     Electrode Potential: The difference in potential between the metal or a gas in contact with its ions.

                     Standard Electrode Potential: The potential of a half cell when concentration of the electrolyte is 1M.

                     Cell Potential: Ecell = Ecathode - Eanode

                     Nerns't Equation: It is the equation which describes the variation of electrode potential with concentration.

E = E -

2.303RT

log Q

nF

                      

                     Reference Electrode: It is the electrode whose potential is determined accurately and is reproductible. Example: Calomel Electrode

                     Indicator Electrode: It is the electrode whose potential depends upon the concentration of a particular ion in solution. Example: Electrodes for pH and acid base titrations.

                     Electromotive Force (e.m.f): The flow of current due to the potential difference from the electrode of higher potential to the electrode of lower potential is called electro motive force. It is expressed in volts or milli volts.

                     Standard Hydrogen Electrode: Passing of pure and dry hydrogen gas through an electrode at one atmosphere at 298 K through a platinum foil and one molar HCl solution.

                     De Electronation: Passing of metal atoms on a metal rod into the solution as metal cations.

                     Electronation: Abstraction of electrons by metal cations in a solution from a metal rod and form neutral metal atoms.

                     Reversible Cell: By the application of external opposing e.m.f. greater than the cell e.m.f., the cell reaction can be reversed. This is reversible cell.

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