Copper(II) oxide

Copper(II) oxide
Names
	IUPAC name Copper(II) oxide
	Other names Cupric oxide
Identifiers
CAS Number	1317-38-0 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:75955 ;
ChEMBL	ChEMBL1909057 ;
ChemSpider	144499 ;
ECHA InfoCard	100.013.882
EC Number	215-269-1;
PubChem CID	14829;
RTECS number	GL7900000;
UNII	V1XJQ704R4 ;
CompTox Dashboard (EPA)	DTXSID5034488 ;
	InChI InChI=1S/Cu.O/q+2;-2 Key: KKCXRELNMOYFLS-UHFFFAOYSA-N ; InChI=1/Cu.O/rCuO/c1-2 Key: QPLDLSVMHZLSFG-PHEGLCPBAN; InChI=1/Cu.O/q+2;-2 Key: KKCXRELNMOYFLS-UHFFFAOYAT;
	SMILES [Cu]=O; [Cu+2].[O-2];
Properties
Chemical formula	CuO
Molar mass	79.545 g/mol
Appearance	black to brown powder
Density	6.315 g/cm3
Melting point	1,326 °C (2,419 °F; 1,599 K)
Boiling point	2,000 °C (3,630 °F; 2,270 K)
Solubility in water	insoluble
Solubility	soluble in ammonium chloride, potassium cyanide ; insoluble in alcohol, ammonium carbonate
Band gap	1.2 eV
Magnetic susceptibility (χ)	+238.9·10−6 cm3/mol
Refractive index (nD)	2.63
Structure
Crystal structure	monoclinic, mS8
Space group	C2/c, #15
Lattice constant	a = 4.6837, b = 3.4226, c = 5.1288 α = 90°, β = 99.54°, γ = 90°
Thermochemistry
Std molar; entropy (S⦵298)	43 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−156 kJ·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H410, H412
Precautionary statements	P264, P270, P273, P301+P317, P330, P391, P501
NFPA 704 (fire diamond)	2 0 1
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Safety data sheet (SDS)	Fisher Scientific
Related compounds
Other anions	Copper(II) sulfide
Other cations	Nickel(II) oxide; Zinc oxide
Related compounds	Copper(I) oxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Copper(II) oxide or cupric oxide is an inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu₂O or copper(I) oxide (cuprous oxide). As a mineral, it is known as tenorite, or sometimes black copper. It is a product of copper mining and the precursor to many other copper-containing products and chemical compounds.