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Chem Test 4 Stack I
Electrochemistry - 12
| Term | Definition |
|---|---|
| Redox Reactions | One chemical species gains electrons while another species loses electrons |
| Reduced | Gains electrons |
| Oxidized | Loses electrons |
| Half-equation Method | Splitting reaction up so that electrons appear explicitly |
| Disproportionation | Different atoms of the same chemical element are oxidized and reduced in the course of a single reaction |
| Electrochemical Cell | Oxidation and reduction half-reactions are carried out at physically separated electrodes |
| Anode | Electrons released by oxidation |
| Cathode | Electrons take up by reduction |
| Salt-bridge | Small passage between anode and cathode |
| Galvanic (voltaic) Cell | Electric current produced by a cell can be used to do work |
| Electrolytic Cell | External souce forces a current through the cell and non-spontaneous reactions are caused to occur |
| Faraday Constant | Gives the charge per mole of electrons |
| Electrical Work | Equal to the change in Gibbs energy of the redox reaction and to the product of the total charge passing through the external circuit and the cell voltage |
| Standard Cell Voltage | Voltage developed by an electrochemical cell in which all reactants and products are in thermodynamic standard states |
| Half-Cell Reduction Potentials | Expresses the intrinsic tendency of a reduction half-reaction to occur when both the reactant and product are in standard states |
| Nernst Equation | The effect of changes of concentrations or pressures on cell voltages |
| pH Meter | An application of the Nernst Equation |