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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, the copper was still be warm enough to be oxidized by the air again.
The color of the heated copper powder becomes black when air is passed over it because of its reaction with oxygen i.e. air. When it reacts with oxygen it forms copper oxide which is black in color.
2Cu + O2 — —> 2CuO
combination reaction
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