Copper oxide is a yellow or even red crystalline powder. The difference in color is caused by the size of particles. The structure is a chalcopyrite type structure (cubic crystal system) with a relative density of 6.04. The melting point is at 232 â?? and the heat of formation is 166.67 kJ/mol. At 1800 â??, it loses oxygen and is insoluble in water but soluble in ammonia water. It reacts with concentrated hydrochloric acid to produce white cuprous chloride crystalline powder.
Cuprous oxide, also named Copper I Oxide, is the inorganic compound with the formula Cu2O. It is one of the principal oxides of copper. This brownish red powder is a component of some antifouling paints. Cuprous nanoparticles is a stable, red solid powder formed by the reduction of Cu2+ solutions and contains Cu+ ions in linear coordination to oxygen.
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