This reaction occurs more rapidly in older eggs as the whites are more alkaline. This color change is due to iron(II) sulfide, which forms as iron from the yolk reacts with hydrogen sulfide released from the egg white by the heat. When eggs are cooked for a long time, the yolk's surface may turn green. Pyrrhotite is a waste product of the Desulfovibrio bacteria, a sulfate reducing bacteria. These metal sulfides, such as iron(II) sulfide, are often black or brown, leading to the color of sludge. Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides, which are not water-soluble. Iron sulfides occur widely in nature in the form of iron–sulfur proteins.Īs organic matter decays under low-oxygen (or hypoxic) conditions such as in swamps or dead zones of lakes and oceans, sulfate-reducing bacteria reduce various sulfates present in the water, producing hydrogen sulfide. In moist air, iron sulfides oxidize to hydrated ferrous sulfate. Iron sulfide reacts with hydrochloric acid, releasing hydrogen sulfide: FeS + 2 HCl → FeCl 2 + H 2S FeS + H 2SO 4 → FeSO 4 + H 2S All are black, water-insoluble solids.įeS can be obtained by the heating of iron and sulfur: Fe + S → FeSįeS adopts the nickel arsenide structure, featuring octahedral Fe centers and trigonal prismatic sulfide sites. Iron sulfides are often iron-deficient non-stoichiometric. sulphide) is one of a family chemical compounds and minerals with the approximate formula Fe S. The name originates from the German word kupfernickel, which means "false copper" from the illusory copper color of the ore.Iron(II) sulfide or ferrous sulfide (Br.E. The bulk of mined nickel comes from laterite and magmatic sulfide ores. Nickel is sometimes found free in nature but is more commonly found in ores. It is one of four elements that are ferromagnetic and is used in the production of various type of magnets for commercial use. Nickel is a hard and ductile transition metal that is considered corrosion-resistant because of its slow rate of oxidation. In its elemental form, nickel has a lustrous metallic silver appearance. The nickel atom has a radius of 124 pm and a Van der Waals radius of 184 pm. Nickel was first discovered by Alex Constedt in 1751. The number of electrons in each of nickel's shells is and its electron configuration is 3d 8 4s 2. Nickel (atomic symbol: Ni, atomic number: 28) is a Block D, Group 4, Period 4 element with an atomic weight of 58.6934. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement. Typical and custom packaging is available. American Elements produces to many standard grades when applicable, including Mil Spec (military grade) ACS, Reagent and Technical Grade Food, Agricultural and Pharmaceutical Grade Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Nanoscale elemental powders and suspensions, as alternative high surface area forms, may be considered. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards. Nickel Sulfide is generally immediately available in most volumes. Metallic ions can also be dispersed utilizing suspended or coated nanoparticles and deposited utilizing sputtering targets and evaporation materials for uses such as solar energy materials and fuel cells. Organometallic forms are soluble in organic solutions and sometimes in both aqueous and organic solutions. Most metal sulfate compounds are readily soluble in water for uses such as water treatment, unlike fluorides and oxides which tend to be insoluble. Sulfate compounds are salts or esters of sulfuric acid formed by replacing one or both of the hydrogens with a metal. Nickel Sulfide is a moderately water and acid soluble Nickel source for uses compatible with sulfates. Thin Film Deposition & Evaporation Materials.Additive Manufacturing & 3D Printing Materials.
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