Nickel(II) oxide

Nickel(II) Oxide

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Nickel(II) oxide

Nickel(II) oxide is the chemical compound

Chemical compound

A chemical compound is a Chemical substance consisting of two or more different chemical element Chemical bond together in a fixed mass ratio that can be split into simpler substances....
with the formula Ni

Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
O

Oxygen

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Encyclopedia

Nickel(II) oxide
General
Other names	Nickelous oxide Nickel monoxide
Molecular formula Chemical formula A chemical formula is a way of expressing information about the atoms that constitute a particular chemical compound, and how the relationship between those atoms changes in chemical reactions....	NiO
Molar mass Molar mass Molar mass, symbol M, is the mass of one mole of a substance . It is a physical property which is characteristic of each pure substance. The base SI unit for mass is the kilogram but, for both practical and historical reasons, molar masses are almost always quoted in grams per mole , especially in chemistry....	74.69 g/mol
Appearance	green crystalline solid
CAS number CAS registry number CAS registry numbers are unique numerical identifiers for chemical elements, chemical compound, polymers, biological sequences, mixtures and alloys....	[1313-99-1]
Properties
Density Density The density of a material is defined as its mass per unit volume. The symbol of density is .... and phase Phase (matter) In the physical sciences, a phase is a region of space , throughout which all physical properties of a material are essentially uniform. Examples of physical properties include density, refractive index, and chemical composition....	6.67 g/cm³, solid
Solubility in water Water (molecule) File:Blue-water-pool.jpgWater is the most abundant molecule on Earth's surface, constituting about 70% of the Earth's surface in liquid, solid, and gaseous states....	negligible
Melting point Melting point The melting point of a solid is the temperature range at which it changes states of matter from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium....	1984 °C
Hazards
MSDS Material safety data sheet A material safety data sheet is a form containing data regarding the properties of a particular substance. An important component of product stewardship and workplace safety, it is intended to provide workers and emergency personnel with procedures for handling or working with that substance in a safe manner, and includes information such...
EU classification Directive 67/548/EEC The Dangerous Substances Directive is one of the main European Union laws concerning chemical safety. It was made under Article 100 of the Treaty of Rome....	Carc. Cat. 1 Carcinogen The term carcinogen refers to any substance, radionuclide or radiation that is an agent directly involved in the promotion of cancer or in the increase of its propagation.... Toxic (T)
NFPA 704 NFPA 704 NFPA 704 is a standard maintained by the United States-based National Fire Protection Association. It defines the colloquial "fire diamond" used by emergency personnel to quickly and easily identify the risks posed by nearby hazardous materials....
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Standard state In chemistry, the standard state of a material is a reference point used to calculate its properties under different conditions. In principle, the choice of standard state is arbitrary, although the International Union of Pure and Applied Chemistry recommends a conventional set of standard states for general use.... Infobox disclaimer and references

Nickel(II) oxide is the chemical compound

Chemical compound

Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
O

Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
. It is notable as being the only well characterised oxide of nickel although there have been many reports of others (nickel(III) oxide

Nickel(III) oxide

Nickel oxide has been referred to in the literature but is not a well characterised compound. The substance black nickel oxide is sometimes described as being Ni2O3 however the composition quoted by suppliers has a nickel content of around 77% by weight whereas Ni2O3 would have 70.98% Ni by w...
, Ni₂O₃, and nickel dioxide, NiO₂).

The mineralogical form of NiO, bunsenite, is very rare. It was suspected for causing green colour of chrysoprase

Chrysoprase

Chrysoprase or chrysophrase is a gemstone variety of chalcedony that contains small quantities of nickel. Its color is normally apple-green, but varies to deep green....
, but later it was rejected.

Preparation and properties

The best method of preparation is through pyrolysis of a nickel(II) compounds such as Ni(OH)₂, Ni(NO₃)₂, and NiCO₃, which yield a light green powder.Synthesis from the elements by heating the metal in oxygen can yield grey to black powders which may indicate nonstoichiometry

Non-stoichiometric compound

Non-stoichiometric compounds are chemical compounds with an chemical element composition that cannot be represented by a ratio of well-defined natural numbers, and therefore violate the law of definite proportions....
. NiO is a basic oxide

Basic oxide

In chemistry, a basic oxide is an oxide that either*reacts with water to form a base.*reacts with an acid to form a salt.Examples include:...
.

Structure

NiO adopts the NaCl structure, with octahedral Ni(II) and O²⁻ sites. Like many other binary metal oxides, NiO is often non-stoichiometric, meaning that the Ni:O ratio deviates from 1:1.