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20 Cards in this Set
- Front
- Back
Redox Reaction
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A reaction which involves the transfer of electrons in oxidation and reduction reactions.
Oxidation - loses e- Oxidizing agent - gains e- Reduction - gain e- Reducing agent - loses e- |
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Electrochemical cell
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A device which consists of two electronic conductors dipping into an electrolyte solution or solid
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Half reactions
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Either the oxidation or reduction reactions of a redox reaction showing the transfer of electrons
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Electrode
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Electronic conductor and its surrounding electrolyte
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Salt Bridge
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Electrolyte solution which completes the circuit
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Liquid Junction
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Two solutions in direct contact with one another between a porous membrane which forms the liquid junction
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Galvanic cell
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Cell that produces electricity due to a spontaneous reaction inside
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Electrolyte cell
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A cell where a non spontaneous reaction is driven by a external source
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Fuel cell
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Galvanic cell which CH4, O2, H2 are continuously sourced from outside the cell
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Anode
Cathode |
Loses electrons (oxidation)
Gains electrons (reduction) |
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Zero Current potential
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Potential difference when an electrochemical cell is balanced against an external source of potential
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Half life
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Time required to convert one half of the reactants into products
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Daniel Cell
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A cell consisting of a zinc electrode immersed in a
solution of zinc ions, connected to a solution of copper ions in which a copper electrode is immersed. Zinc is more reactive that copper so is oxidized and has a more negative potential |
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Common redox reactions
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Combustion, respiration, photosynthesis and corrosion
ESSENTIAL ALSO FOR COENZYMES (FAD, NAD, NADH etc) |
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Electrochemistry
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Uses electrical measurements to quantify oxidation and reduction reactions
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When describing a half cell or electrochemical cell what definitions would you use
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Anode, cathode, electrode, electrochemical cell, redox reaction etc
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Electrode types
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Metal electrode
Gas electrode Insoluble salt electrode Redox electrode |
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How do you calculate the zero current potential of a cell?
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Difference between the right hand and left hand electrode
rE - lE Left hand cell loses electrons |
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What is the Nernst Equation?
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E = E° − (RT/νF) lnQ
Can be used to calculate half cell potential |
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Left Hand cell...
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Loses electrons
strong oxidizing agent |