Description: A piece of copper is heated in a flame until it is coated with black copper oxide. The flame is extinguished. While still hot, the copper is bathed in hydrogen gas, and the original coppery color returns. The reaction may be repeated as long as the copper object is very hot.

This demonstration is also available on video and JCE "Chemistry Comes Alive!" Vol. 1 CD-Rom.

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Source: UW card catalog

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