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en.wikipedia.org/wiki/Copper(II)_oxide

Copper(II) oxide or cupric oxide is the inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu 2 O or cuprous oxide.As a mineral, it is known as tenorite.It is a product of copper mining and the precursor to many other copper-containing products and chemical compounds.

en.wikipedia.org/wiki/Copper(I)_oxide

Copper(I) oxide or cuprous oxide is the inorganic compound with the formula Cu 2 O. It is one of the principal oxides of copper, the other being CuO or cupric oxide. This red-coloured solid is a component of some antifouling paints. The compound can appear either yellow or red, depending on the size of the particles.

www.wisegeek.com/what-is-copper-oxide.htm

Oxygen can combine with copper can combine in different ways to form two types of compound: copper(I) oxide, which is normally a reddish powder, and copper(II) oxide, which is usually a black powder. They occur naturally as minerals in crystal form. Both forms of copper oxide are used in the production of pigments, but they have a number of other, differing, uses.

www.reference.com/science/formed-copper-reacts-oxygen-af93...

Copper oxide is formed when copper reacts with oxygen. In chemistry experiments, this reaction can be sparked by heating copper with a burner, turning the original copper black. The black copper oxide that is produced can be restored to original copper color through a reaction with hydrogen.

www.quora.com/Why-is-copper-oxide-green

First of all CuO or copper oxide is black in colour. It is actually a Salt. CuO is a very important reagent in the laboratory. It has many uses like proper disposal of some organic and inorganic compounds( cyanide, etc.,.) and it is also used to preserve wood too.

www.rsc.org/.../reacting-copper-ii-oxide-with-sulfuric-acid...

In this experiment an insoluble metal oxide is reacted with a dilute acid to form a soluble salt. Copper(II) oxide, a black solid, and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution. From this solution, blue copper(II) sulfate pentahydrate crystals can be obtained.

www.reference.com/science/copper-oxide-d1a6d126247c2226

Copper oxide is a chemical compound made up of two elements, namely copper and oxygen. Copper combines with oxygen to form copper I oxide or copper II oxide. Copper I oxide is a black compound while copper II oxide is red. Copper I oxide occurs naturally in some parts of the world as mineral cuprite.

www.britannica.com/science/cuprous-oxide

In copper: Principal compounds …industrial compounds of copper(I) are cuprous oxide (Cu 2 O), cuprous chloride (Cu 2 Cl 2), and cuprous sulfide (Cu 2 S). Cuprous oxide is a red or reddish brown crystal or powder that occurs in nature as the mineral cuprite. It is produced on a large scale by reduction of mixed copper oxide ores with copper…

www.kbcc.cuny.edu/.../PHYSCI/PL/chm11/Documents/Copper.pdf

Solid copper oxide, zinc metal in a hydrogen-generator bottle with thistle tube, 3 M sulfuric acid, a large test tube, a small test tube, two beakers (100 mL), Bunsen burner, calcium sulfate in a drying tube. ... Brass is formed from a mixture of copper and zinc. Bronze is formed from copper and tin. In the United States copper is used at a ...

www.rsc.org/...the-formula-of-copper-ii-oxide?cmpid=CMP00006606

Students heat copper(II) oxide in a glass tube while passing methane over it. The copper(II) oxide is reduced to copper. If the reactants and products are weighed carefully the formula of the copper oxide can be deduced. This could also be used simply as an example of reduction.