Why Do Pennies Turn Green?

Answer

Pennies turn green when their copper content interacts with elements in their environment, including the carbon dioxide in the air. Copper and carbon dioxide combine to form a compound called copper carbonate and this greenish substance is often called verdigris.
Q&A Related to "Why Do Pennies Turn Green"
in about a week i did it as a science project.
http://wiki.answers.com/Q/How_fast_will_a_penny_tu...
Pennies turn green and the bottoms of the pennies stay copper coloured. .
http://www.chacha.com/question/what-causes-pennies...
1. Add 1/2-teaspoon of zinc dust the the bottom of a clean evaporating dish. An evaporating dish is essentially a shallow glass bowl. Add four teaspoons of liquid lye to the zinc.
http://www.ehow.com/how_6524716_turn-penny-gold.ht...
Copper oxide (CuO) which is always present on copper surface reacts with acetic acid (the solution of which is vinegar) and forms green copper (II) acetate: CuO + 2CH3COOH = Cu(CH3COO
http://answers.yahoo.com/question/index?qid=200711...
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