Electrochemistry
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Oxidation | Loss of electrons
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| Reduction | Gain of electrons
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| Oxidizing agent | Species that causes other species to be oxidized, or the species that is reduced
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| Reducing agent | Species that causes the other species to be reduced, or the species that is oxidized
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| Anode | The species in a galvanic cell that is oxidized
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| Cathode | The species in a galvanic cell that is reduced
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| In a galvanic cell, electrons flow from ___ to ___. | anode to cathode
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| In a galvanic cell with a salt bridge, ___ ions flow to the anode and ___ ions flow to the cathode | negative ions (anions) to anode, positive ions (cations) to cathode
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| In a galvanic cell with a porous disc, ___ ions flow to the anode. | negative ions (anions)
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| A spontaneous reaction must have a ____ sign on the cell potential | positive
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| The Faraday Constant | 96,485 C/mol e-
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| The equation for finding the free energy of an electrochemical reaction | deltaG = - n * F * E where n is the number of moles of electrons transferred, F is the Faraday constant, and E is the total cell potential
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| Order of steps when balancing a simple redox reaction | 1. Write half-reactions
2. Balance atoms
3. Balance charges by adding electrons
4. Multiply equations to have same number of electrons on either side
5. Cancel electrons
6. Add half-reactions together
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| Order of steps when balancing a complex redox reaction in acidic solution | 1. Write half-reactions
2. Balance atoms
3. Balance oxygens by adding H2O
4. Balance hydrogens by adding H+
5. Balance charges by adding e-
6. Multiply equations to have same number of electrons on either side
7. Cancel e-
8. Add half-reactions
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| Order of steps when balancing a complex redox reaction in basic solution | 1. Write half-rxns
2. Balance atoms
3. Balance Os by adding H2O and Hs by adding H+
5. Balance charges by adding e-
6. Multiply to have same # of e- on each side
7. Cancel e-
8. Add half-rxns
9. Add OH- to each side matching # of H+
10. Cancel H2O
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Created by:
shudonmiller
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