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23 Cards in this Set
- Front
- Back
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reduction
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gain of e-
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oxidation
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loss of e-
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OIL RIG
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oxi is lossing
Reduc is gaining |
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oxidizing agent
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becomes reduced (gain) oxidize someting eles
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reducing agent
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becomes oxidized (loss) reduce someting eles
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oxidation # of element in its standard form is
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0
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oxidation # of monoatomic ion is the same as its
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charge
Na+ =+1 Cl-1 = -1 |
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oxidation # of oxygen is
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-2
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oxidation # of H
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+1
except when it occurs in metal ion =-1 |
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oxidation # of F (halogen)
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-1
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oxidation # of group 1A
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+1
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oxidation # of group 2A
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+2
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sum of all oxidation # in compound is
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zero
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sum of all oxidation # in polyatomic ion
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equal to charge of the ion
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oxidation # of binary compound
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the element w/ higher electronegativity equal to its charge in simple ionic compound
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balancing redox
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1.seperate two half exn
2. balance all atom except H and O 3. acidic, use H2O for O and H for H basic OH- for H2O and H2O for H 4. balance charge 5. two equation must have same # of e- |
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galvanic/voltaic cell
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redox half rxn carry out in sep compartment
neg dG indicates spontaneous postive EMP indicates spontaneuos flow of e-, from anode to cathodel oxidation (loss) take place in anode reduction in cathod |
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electrolytic cell
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postive dG and - EMF
indicates nonspontaneous thus electrical energy is required has battery oxidation is at anode but anode is postive means positive side of the battery is connected to the anode |
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Faraday's law
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amt of oxidation reduction rxn occuring in electrolytic cell is propotinal to amt of current passing through
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electrodes (an ox, red cat)
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oxidation happens at the anode (an Ox)
reduction happens at the cathode (red cat) |
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reduction potential
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more postive the potential the greater tendency to be reduce
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electromotive force (EMF)
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EMF = Ered + Eox
E=red potential and ox potential |
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dG=-nFEcell
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more positive EMF more negative dG thus more favorable it is
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