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OpenStudy (anonymous):

when copper is expossed to air what happens?

OpenStudy (anonymous):

Oxidation happens, it turns green like the Statue Of Liberty, and most pennies.

OpenStudy (chmvijay):

it become s copper oxide :)

OpenStudy (anonymous):

Over a course of time, copper is oxidized. It takes a while for it to occur of course. That's why older buildings with copper roofs are greeny blue and newer ones aren't.

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