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What copper oxides form when copper is heated in oxygen?

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A periodic table element box for copper shows its symbol Cu, atomic number 29, atomic weight 63.546, electron configuration, and name. Icons indicate copper is a solid, weakly basic transition metal with face-centered cubic crystal structure. A key explains the symbols and color coding.
copper Properties of copper.

When copper is heated in the presence of oxygen, it forms two primary oxides corresponding to its two common valences:1

  • Cupric oxide (CuO): Also known as copper(II) oxide, this is a black powder that forms when copper reacts with oxygen at red heat.213
  • Cuprous oxide (Cuā‚‚O): Also known as copper(I) oxide, this is a red or reddish-brown crystalline material that forms at higher temperatures.2413