Copper(II) oxide
Systematic name	Copper(II) oxide
Other names	cupric oxide
Molecular formula	CuO
Molar mass	79.545 g/mol
CAS number	[1317-38-0]
Density	6.31 g/cm3
Solubility (water)	~0 g/l
Melting point	1201 °C +
Boiling point	xx.x °C
Disclaimer and references

Copper(II) oxide or cupric oxide (CuO) is the higher oxide of copper. It is a black solid with an ionic structure which melts above 1200 °C with some loss of oxygen. It can be formed by heating copper in air, but in this case it is formed along with copper(I) oxide; thus, it is better prepared by heating copper(II) nitrate, copper(II) hydroxide or copper(II) carbonate: Sample of copper(II) oxide File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... IUPAC nomenclature is a systematic way of naming organic chemical compounds. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per volume. ... It has been suggested that Solid solubility be merged into this article or section. ... This article describes water from a scientific and technical perspective. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... An oxide is a chemical compound of oxygen with other chemical elements. ... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic pinkish red Atomic mass 63. ... An ionic bond can be formed after two or more atoms give up (or gain) electrons, so as to become ions. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... Copper(I) Oxide or Cuprous oxide (Cu2O) is an oxide of copper. ... A sample of copper(II) nitrate trihydrate Copper(II) nitrate, commonly referred to as copper nitrate, is a blue, crystalline solid at STP. The roman numeral sign is to specify the ionic makeup of the copper, in this case a +2 charge. ... Copper(II) hydroxide is the hydroxide salt of the metal copper, with atomic mass approximately 97. ... Copper(II) carbonate (often called copper carbonate or cupric carbonate) is a blue-green compound (chemical formula CuCO3) forming most of the patina one sees on weathered brass, bronze, and copper. ...

CuCO₃ → CuO + CO₂

Copper(II) oxide is a basic oxide, so it dissolves in mineral acids such as hydrochloric acid, Sulfuric acid or nitric acid to give the corresponding copper(II) salts: The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... An oxide is a chemical compound of oxygen with other chemical elements. ... The chemical compound hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... The chemical compound nitric acid (HNO3), otherwise known as aqua fortis or spirit of nitre, is an aqueous solution of hydrogen nitrate (anhydrous nitric acid). ...

CuO + 2 HNO₃ → Cu(NO₃)₂ + H₂O

It can also be reduced to copper metal using hydrogen or carbon monoxide: General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic pinkish red Atomic mass 63. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... Carbon monoxide, with the chemical formula CO, is a colourless, odourless, and tasteless gas. ...

H₂ + CuO → Cu + H₂O

Copper (II) oxide has uses as a p-type semiconductor, with a narrow band gap of 1.2 eV. In solid state physics and related applied fields, the band gap is the energy difference between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. ...

See also

• copper(I) oxide

Copper(I) Oxide or Cuprous oxide (Cu2O) is an oxide of copper. ...

External links

• National Pollutant Inventory - Copper and compounds fact sheet

• Link page to external chemical sources.