There is a peice of a copper wire in an aqueous solution. Upon closer expection, you realize the copper has a hard, metallic, substance coating it. Propose what might have happened. Include an...

There is a peice of a copper wire in an aqueous solution. Upon closer expection, you realize the copper has a hard, metallic, substance coating it. Propose what might have happened. Include an example of a possible chemical reaction.

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It sounds like the copper was placed in an solution of an ionic compound with a metal less reactive than copper.  A displacement reaction occurs, the copper replaces the metal in the solution, and the other metal forms an insoluble precipitate around the copper. 

A popular demonstration of this exact type of reaction is to place copper in a Silver Nitrate solution.  2AgNO3(aq) + Cu(s) ------>Cu(NO3)2(aq) + 2Ag(s) The Silver precipitates out slowly forming flakes around the Copper and the solution turns blue as it is now a Copper (II) Nitrate solution.  I did this in High School. 

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