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Electrochemistry. Redox Oxidation / Reduction. Potato Clock. My name is Leo. Grr-rrrr…. Leo Ger. “Lose electron  oxidation” Zn  2e - + Zn 2+ “Gain electron  reduction” 2e - + Cu 2+  Cu. Rules for assigning oxidation states. Redox Reaction.

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electrochemistry

Electrochemistry

Redox

Oxidation / Reduction

leo ger

My name is Leo.

Grr-rrrr…

Leo Ger

“Lose electron  oxidation”

Zn  2e-+ Zn2+

“Gain electron  reduction”

2e- + Cu2+  Cu

redox reaction
Redox Reaction

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 591

electron flow
Electron Flow

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 592

ion flow keeps the charge neutral
Ion flow keeps the charge neutral

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 592

the salt bridge contains a strong electrolyte
The salt bridge contains a strong electrolyte

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 592

the porous disk allows ion flow
The porous disk allows ion flow

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 592

schematic of a battery
Schematic of a Battery

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 593

simple battery
Simple Battery

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

redox of a battery
Redox of a Battery

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

types of batteries
Types of Batteries
  • Lead
  • Ni-cad
  • Alkaline
  • Rechargeable
  • Mercury
  • Lithium
one cell of a lead battery
One Cell of a Lead Battery

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 595

the first battery
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.

Zinc disc

Copper

disc

Newmark, CHEMISTRY, 1993, page 46

a mercury battery
A Mercury Battery

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 596

a common dry cell battery
A Common Dry Cell Battery

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 596

cathodic protection of an underground pipe
Cathodic Protection of an Underground Pipe

Zumdahl, Zumdahl, DeCoste, World of Chemistry2002, page 598