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Why Do Pennies Turn Green When Vinegar Is Added?

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Pennies turn green because a chemical change with oxygen. The chemical change creates copper oxide (2Cu + O2 ---> CuO). Which eventually turns the pennies green.
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Ok...
There is a chemical reaction in the penny that somehow involves oxygen. I think that it is called copper oxide...
So that turns the penny green. When it is left under vinegar, something happens that brings the chemicals out of the penny and on to the vinegar soaked cloth. The oxygen mixes in with the cloth, and the penny absorbs the whole mixture. (you may notice that after a day, the cloth smells real bad.) that is why the penny turns green.
P.s. You guys r all stupid! This was written by an 11 yr. Old!!!

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