Question

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What happens when copper is heated ?????

Answer 1

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.

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Answer 2

Copper changes colors because of surface oxidation. A clean copper surface will appear, well, copper colored. As it is heated, a layer of black copper oxide will form, thus changing its color. As the temperature increases, the oxide layer will get thicker, up to a point.

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