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Chem 116 Post Exam 3
Question | Answer |
---|---|
Oxidation | loss of electrons |
Reduction | gain of electrons |
Oxidation agent | species that is reduced |
Reduction agent | species that is oxidized |
For an atom in elemental form, what is the oxidation number? | 0 |
What determines the concentration of an oxidizing agent from the known concentration of the reduction agent? | redox titration |
Generally, metal is the ______ agent and nonmetal is the ______ agent | reducing; oxidizing |
Voltaic cell: | uses a spontaneous reaction to generate electrical energy (delta G>0) |
Electrolytic cell: | uses electrical energy to drive nonspontaneous reaction (delta G<0) |
Oxidation half reaction occurs in the... | anode |
Reduction half reaction occurs in the... | cathode |
Anode has _______ charge; Cathode has _______ charge | negative; positive |
Joins half cells allowing ions to flow through both compartments and complete the circuit | salt bridge |
Cell potential (Ecell) | Electrical potential between the two electrodes (voltage) |
For a spontaneous process, Ecell... | >0 |
standard Ecell | =standard E (cathode/reduction) - standard E (anode/oxidation) |
As E(half cell) increases, oxidizing agent ________; reducing agent __________ | increases; decreases |
As E(half cell) decreases, oxidizing agent ________; reducing agent __________ | decreases; increases |
Self contained voltaic cells arranged in a series so that their individual voltages are added | batteries |
As cell operates, it's potential ___________ | decreases |
In electrolysis of pure molten salts, __________ will be reduces and __________will be oxidized | cation; anion |
Positive electrode potential corresponds to _______ | reduction |
Negative electrode potential corresponds to _______ | oxidation |
Steps to balance redox reactions: | 1. Separate into half reaction 2. Balance atoms other than O and H 3. Balance O by adding H2O 4. Balance H by adding H+ 5. Balance charges with e- 6. Multiply each half reactions so that e- are equal |