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Question:

What is the evidence that copper is copper!?

In science we got a blue ish powder that we know is copper... How can I prove that....I kneed two.... I said it was blue and that it needs two valence electron.... Is that good..... I still want one more option

Answer:

Well copper is a pinkish brown metal, not a blue powder. Perhaps you think you have copper sulphate, which is blue You should do a flame test, the colour will determine the presence of copper. Copper does form 2+ ions, but that isn't a test, it is a fact about copper. How do you know the mystery blue power has 2+ions, and even if you had shown this, it wouldn't prove copper, as many other metals have the same. Blue is also not a test, there are other blue substances. the test for sulphate is barium chloride, i think.

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