Chemistry 123

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Chemistry 123

• Week of 3 March 2008

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Rust

• The first step in the formation of rust is
  oxidation of Fe to Fe2.  What reaction occurs at
  the cathode?
• Why does having salt on the roads salt increase
  the rusting of iron (rusting involves oxidation
  of Fe)?
•  

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Corrosion rust
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Preventing rust painting, passivation
http//www.allposters.com/-sp/Chrome-Lights-on-Red
-Car-Posters_i1596190_.htm
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Blueing (magnetite coating)
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www.gutridgeinc.com/
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Stainless steel
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Tin cans, galvanized steel
http//dragonscale.alyra.org/chainmail/stainless-g
alvy_800-2.jpg
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Corrosion
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Electrolysis

• The shoes at right were electroplated with 108 g
  of copper metal (from a copper(II) sulfate
  solution) using a current of 2.50 amperes.
• How long did the process take?

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