Test question?

Question

The element copper is a lustrous red metal. The element oxygen is a coloress,oderless gass. In a laboratory expariment,which of these wouls demonstrate that fthey have formed compound

A the elements have combined a form a new substance that is black,crytallie solid.

B the elements are in diffenent rows on the periodic table.

c Each element appears to be unaffected when placed near a sample of a clear liquid

d both elements are present in a sample of a mixture.

Answer 1

A compound means that a new substance with unique properties has formed.

Only choice "a" fulfills that requirement

Answer 2

I flunked