2007-02-12 03:34:03 · 4 answers · asked by ORLANDO N 1 in Science & Mathematics ➔ Engineering
Forget the bar - unless you want to spend hours filing it to fine turnings!. Get the finest copper wire you can get hold of. Domestic 2 or 3 core power/lighting flex (13 or 5 A) is fine. Strip off the plastic insulation and heat to about 900C in air (a domestic gas flame should just about do it tho a Bunsen or blow torch assures success) You should end up with a nice black powder of cupric oxide ( CuO).
Unless you really just want an oxide coating on a chunk of copper. Heating will do the job by putting down a thin and unstable layer but a chemical treatment might be the answer. I can't think why you'd want to do this latter tho nor can I think of a suitable chemical. Meritic acid? Never heard of it!
2007-02-12 04:00:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Easy - hold it with a pliers in an open flame. It will oxidize there and you will see the typical green colored flame. When it cools you will see the unique cuprous or cupric oxide color on the wire.
2007-02-12 11:40:17 · answer #2 · answered by Rich Z 7 · 0⤊ 1⤋
heat the copper wire!
Cu (s) + O2 (g) -heat-> CuO2 (s)
the Copper wire turns black from reddish/brown.
2007-02-12 11:43:07 · answer #3 · answered by Alju10 1 · 0⤊ 1⤋
brush it with meritic acid. you can buy it at Lowe's
2007-02-12 11:44:31 · answer #4 · answered by iamslydog44 1 · 0⤊ 1⤋