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chemical compound containing sulfur and one other element or sulfur and a radicalradical,
in chemistry, group of atoms that are joined together in some particular spatial structure and that take part in most chemical reactions as a single unit. Important inorganic radicals include ammonium, NH4; carbonate, CO3 ; chlorate, ClO3
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. Sulfides may be salts or esters of hydrogen sulfidehydrogen sulfide,
chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbon disulfide.
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, H2S, or may be formed directly, e.g., by heating a metal with sulfur. Hydrosulfides are formed when only one of the hydrogens in hydrogen sulfide is replaced with a metal or radical. Soluble metal sulfides are used in preparing dyes, in leather tanning, as depilatory compounds, and as pesticides. Sulfides of antimony, copper, lead, mercury, silver, and zinc are important as ores; the ores are often roasted, yielding sulfur dioxidesulfur dioxide,
chemical compound, SO2, a colorless gas with a pungent, suffocating odor. It is readily soluble in cold water, sparingly soluble in hot water, and soluble in alcohol, acetic acid, and sulfuric acid.
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 and an oxide of the metal. Pyritepyrite
or iron pyrites
, pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of cubes and pyritohedrons) but is also found in massive, granular, and stalactite
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 is iron disulfide; tarnish on silver is mostly silver sulfide. In chemical analysis, hydrogen sulfide is often used to precipitate from a solution of metal salts certain metal sulfides that have characteristic colors and solubilities. Carbon disulfidecarbon disulfide,
CS2, liquid organic compound; it is colorless, foul-smelling, flammable, and poisonous. It can be prepared by direct reaction of carbon, e.g., as charcoal, with sulfur. It is a widely used solvent, e.g.
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 is an important solvent for organic compounds.



any of several compounds of sulfur with more electropositive elements; sulfides may be regarded as salts of hydrogen sulfide, H2S. There are two sulfide series: the normal sulfides, with the general formula M2S, and the acid sulfides, with the general formula MHS, where M is a monovalent metal.

Sulfides of alkali metals are colorless and dissolve readily in water. Their aqueous solutions are strongly hydrolyzed and exhibit a basic reaction. The action of dilute acids on such sulfides results in liberation of H2S. Sulfides of alkaline-earth metals are colorless, with sparing solubility in water. They liberate H2S in humid air. In other properties they are similar to the sulfides of alkali metals. Both types of sulfides oxidize readily to sulfates.

Sulfides of heavy metals are virtually insoluble in water. Almost all of them are black or brownish black, with the exception of white ZnS, pinkish MnS, yellow CdS, reddish orange Sb2S3, and yellow SnS2. The differing relationship of sulfides to acids and ammonium sulfide is used in chemical analysis.

Many elements form polysulfides, with the general formula M2Sx. These compounds decompose upon heating, with the formation of normal sulfides. Na, K, NH+4, Ca, Sr, and Ba have a particular tendency to form polysulfides.

Sulfides are obtained by (1) direct addition of elements, (2) reaction of aqueous solutions of salts with H2S or (NH4)2S, (3) reaction of hydroxides with H2S, and (4) reduction of sulfates by coal during roasting.

Many sulfides have great practical importance: Na2S, CaS, and BaS are used in the leather industry for tanning, and polysulfides of calcium and barium are used to combat agricultural pests. In addition, PbS, CdS, and ZnS are used as semiconductor materials, and crystals of these and other sulfides are used as semiconductor laser materials. The sulfides of the alkaline-earth metals, along with ZnS and CdS, are bases for luminophors, MoS2 is a solid lubricant, (NH4)2S is an important reagent in qualitative analysis, and FeS2 is a raw material for the production of sulfuric acid.



Any compound with one or more sulfur atoms in which the sulfur is connected directly to a carbon, metal, or other nonoxygen atom; for example, sodium sulfide, Na2S.
References in periodicals archive ?
After using hydrogen sulfide to successfully induce torporlike states in several non-mammalian species, such as yeast, worms, and flies, Mark Roth and his colleagues at the Fred Hutchinson Cancer Research Center in Seattle attempted this feat in common lab mice (Musmusculus), which don't normally undergo torpor.
DTSC-monitored air testing equipment at Belmont has not detected dangerous levels of the hydrogen sulfide in the air, Oudiz said.
While a portion of these oxides and sulfides float to the surface of the molten iron in the treatment vessel.
When the researchers retrieved the samples less than 2 months later, each of the iron-bearing sulfide samples had a pitted, microbe-infested surface that was coated with iron oxide particles.
The hydrogen sulfide naturally combines with the iron in the 35-foot canisters and changes into a solid, iron sulfide.
As the activity levels of the bacteria reach satisfactory levels the process of filling the BIOX(R) tanks with inoculated sulfide material, which is expected to take three months, will commence;
The bacteria harbored in the gland oxidize dissolved sulfides that are absorbed through the snail's gills, says Shana K.
Bernard Endres, an independent petroleum engineer, has argued that the hydrogen sulfide is coming from a natural vein of petroleum that runs under the school site.
Researchers thought that to be degraded, hydrogen sulfide would need to be in contact with bacteria for 10 seconds or even longer, which would require an impractically large filter for a sewage-treatment plant.
The hydrogen sulfide problem is the latest to surface in a continuing Daily News investigation of environmental concerns that threaten completion of construction of the school, which was sold as a bold, new experiment in public-private partnership with Kajima construction company.
4 meter interval of auriferous massive sulfide perched over 30 meters of strongly altered and foliated meta-volcanic rock.
The first complete synthesis of what might be called the iron sulfide theory for the origin of life appeared in the January Philosophical Transactions of the Royal Society of London B.