What happens when oxygen is passed over copper and heated?
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If hydrogen gas is passed over heated copper oxide (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained. ...
The hydrogen is gaining oxygen and is being oxidised.In other words, one reactant gets oxidised while the other gets reduced
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Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, thecopper was still be warm enough to be oxidized by the air again.
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