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CHEMISTRY 102 ELECTROCHEMISTRY OUTLINE

CHEMISTRY 102 ELECTROCHEMISTRY OUTLINE. I. OXIDATION (REVIEW) . A. Lose electrons "OXIDATION" (LEO) - Low Electronegativity B. Oxidation Numbers (+ charge: "0" for elements) C. Solid Metals (IA, IIA, Transitions) D. SOP - Standard Oxidation Potential

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CHEMISTRY 102 ELECTROCHEMISTRY OUTLINE

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  1. CHEMISTRY 102ELECTROCHEMISTRYOUTLINE

  2. I. OXIDATION (REVIEW) A. Lose electrons "OXIDATION" (LEO) - Low Electronegativity B. Oxidation Numbers (+ charge: "0" for elements) C. Solid Metals (IA, IIA, Transitions) D. SOP - Standard Oxidation Potential E. "0" - Hydrogen Reference Electrode

  3. II. REDUCTION(REVIEW) A. Gain electrons "REDUCTION" (GER) High Electronegativity B. Oxidation Numbers (- charge: "0" for elements) C. Metal Cations (Usually Transitions) & Non-Metal Elements(Halogens) D. SRP - Standard Reduction Potential E. "0" - Hydrogen Reference Electrode

  4. III. CELLS (VOLTAIC) A. Oxidized Species - Anode(attracts anions): ANOX = "-" electrode B. Reduced Species – Cathode (attracts cations): REDCAT ="+" electrode C. Salt Bridge (electrolyte) - provides flow of anions D. Circuit - electron flow (spontaneous) delta G = "-" E. Half-Reactions (must have both, cannot have one without the other) F. NET REACTION (no electrons) Review Redox Reactions

  5. IV. BATTERIES A. Dry Cell: non-rechargeable B. Alkaline: non-rechargeable C. Mercury: non-rechargeable D. Lead Storage: rechargeable E. Ni-Cd: rechargeable F. Li-H (lithium hydride): rechargeable G. Fuel cell: hydrogen + oxygen yields water (non-polluting)

  6. V. ELECTROLYTIC CELLS A. NaCl 1. Molten – “Know Products” 2. Aqueous – “Know Products” B. Electroplating 1. Protection 2. Jewelry

  7. VI. CORROSION A. Iron: "RUST" requires H2O, O2 and is enhanced by salt and low temperatures B. Other Metals 1. Copper: Green 2. Silver: Black 3. Zinc: White C. Protection 1. Paint 2. Plate with different metal 3. Cathodic Protection – Sacrificial Anode

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