Cu + O2 → CuO2 – Balanced equation

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This is an oxidation-reduction (redox) reaction:

Cu - 4 e^- → Cu^IV (oxidation)

2 O + 4 e^- → 2 O^-II (reduction)

Cu is a reducing agent, O₂ is an oxidizing agent.

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Reactants:

Cu
- Names: Copper , Copper (dusts and mists, as Cu) , Cu
- Appearance: Solid in various forms. turns green on exposure to moist air ; Reddish, lustrous, malleable, odorless solid.
O₂
- Names: Dioxygen , Oxygen , Oxygen (liquefied)
- Appearance: Odourless compressed gas ; Liquefied gas. colourless-to-blue extremely cold liquid