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Casey Lee
Geography
3 January, 20:48
What causes clean change?
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Kara
3 January, 20:49
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Here's what's happening: The oxygen in the air and the copper in the pennies form an oxide that coats the pennies and makes them look dirty. The acids (usually vinegar - acetic acid) break the copper oxide free from the penny. As we have seen experimentally, acid alone does not clean as well as acid and salt.
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