About copper oxides:
Oxygen can be combined with copper in two ways to form two different substances, one being copper I oxide, usually red powder, and copper II oxide, which is black. These two substances are usually found in mineral form in crystalline form. Both compounds of copper oxides are used in the pigment industry, but these two substances are also used separately in other industries.
Copper oxide is naturally found in black or gray tenorite. Like Cu2O, it can be made by heating copper, but at a lower temperature. In this method, a crude substance is produced from copper oxide, although by heating some oxygen-containing copper compounds, such as carbonate, hydroxide, or nitrate, a black solid is formed which melts at 1200 ° C. At this temperature, some of the oxygen is lost and the rest of the copper will be oxide. Like other forms, copper (II) oxide is insoluble in most solvents but reacts with acids.
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