General Chemistry II Exam I - Chemistry Exam I Oxidation Loss of electrons by a species(increase oxidation Reduction Gain of electrons by a

General Chemistry II Exam I - Chemistry Exam I Oxidation...

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Chemistry Exam I: Oxidation: Loss of electrons by a species (increase oxidation #) Reduction: Gain of electrons by a species (decrease oxidation #) Oxidizing Agent: electron acceptor, species is reduced Reducing agent: electron donor, species is oxidized Balancing Redox Reactions: 1) Write out all oxidation numbers to see what’s being oxidized, reduced 2) Write out half reactions 3) Balance Oxygens by adding H2O and balance Hydrogens by adding H+ 4) For acidic solutions: Balance net charges by adding electrons 5) Multiply equations so electrons cancel out 6) Add two half reactions 7) Add OH- to make water and cancel out H+ 8) Cancel out what you can (Especially water molecules) Types of Redox reactions: o Direct: No external circuit (no useful electric current) o Indirect: External circuit (useful current, external wire used) Electrochemical cells: Apparatus that allows a redox reaction to occur by transferring electrons through an external connector (circuit). o Galvanic/voltaic cell: Produces electrical energy. Chemical change produces electric current. DeltaGrxn<0. Product favored reaction. Ex. Batteries o Electrolytic cell: Requires electrical energy. Electrical current used to cause chemical change in a non-spontaneous reaction. DeltaGrxn>0.

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