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UB CHE 102 - Electrochemistry Part II

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Chem 102 1st Edition Lecture 16 Outline of Last Lecture I. Oxidation- Reduction ReactionII. Voltaic CellsIII. Cell EMFIV. Spontaneity of Redox ReactionsOutline of Current LectureI. Effects of Concentration on Cell EMFII. BatteriesIII. CorrosionIV. ElectrolysisCurrent LectureI. Effects of Concentration on Cell EMF- A voltaic cell is functional until equilibrium has been reached. The Nernst Equation relates emf to concentration. QRTGG ln-We can use this equation to generate a cell that has an emf based solely on difference in M. One compartment will be a dilute solution while the other is concentrated. -A system at equilibrium has a Change in G= 0. II. Batteries -Fuel cells are a direct production of electricity from fuels occurs in a fuel cell. Electric cars are powered by these. III. CorrosionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Corrosion of iron can be oxidized by oxygen, dissolved oxygen in water particularly. Corrosion of iron can be prevented by coating the iron with paint or another metal. Galvanized iron is coated with a thin layer of zinc. To prevent underground pipelines from corrosion, an artificial anode is added, the water pipe is the cathode and active metal is used as an anode.-Most metals have negative reduction potentials and should react with oxygen. Some metals are inert because of the metal oxide which forms at the surface. Passivation is the of coatingthe surface with a thin oxide layer to make it inert. IV. Electrolysis- Non-spontaneous reactions require an external current in order to force the reaction to proceed. Electrolysis reactions are non-spontaneous. The external Emf must be greater thanEcell to drive the reaction. -In voltaic and electrolytic cells, reduction occurs in the cathode and oxidation in the anode. However, in electrolytic cells, electrons are forced to flow from the anode to the cathode, the anode is positive and the cathode is negative. -Electrical Work- Free energy is a measure of the max amount of useful work that can be obtained from a system. If work is negative then work is performed by the system and E is


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UB CHE 102 - Electrochemistry Part II

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