Electrochemistry Redox Oxidation / Reduction

Potato Clock

Leo Ger “Lose electron  oxidation” Zn  2e - + Zn 2+ “Gain electron  reduction” 2e - + Cu 2+  Cu My name is Leo. Grr-rrrr…

Rules for assigning oxidation states

Redox Reaction Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 591

Electron Flow Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 592

Ion flow keeps the charge neutral Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 592

The salt bridge contains a strong electrolyte Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 592

The porous disk allows ion flow Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 592

Schematic of a Battery Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 593

Simple Battery Kelter, Carr, Scott, Chemistry A Wolrd of Choices 1999, page 487

Redox of a Battery Kelter, Carr, Scott, Chemistry A Wolrd of Choices 1999, page 487

Standard Electrode Potentials

Types of Batteries Lead Ni-cad Alkaline Rechargeable Mercury Lithium

One Cell of a Lead Battery Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 595

The First Battery Alessandro Volta (1745 – 1827) Generate electricity by putting a layer of cardboard soaked in brine between discs of copper and zinc – a voltaic cell. When he made a ‘pile’ of these cells, he increased the amount of electricity generated. This was the first battery – a collection of cells. Newmark, CHEMISTRY,  1993, page 46 Zinc disc Copper disc

A Mercury Battery Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 596

A Common Dry Cell Battery Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 596

Electroplating

Cathodic Protection of an Underground Pipe Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 598