Many metallic sulphides (for example, pyrites) are very easily oxidised with access of air and moisture.
The same occurs with many metallic sulphides and organic substances.
The sulphurous anhydride, SO{2}, which is obtained in the combustion of sulphur and in roasting many metallic sulphides in the air is an example of this kind.
Calcium sulphide, CaS, like many metallic sulphides which are soluble in water, is decomposed by it (Chapter X.
That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with but one atom of sulphur in the molecule.
Native silver is not a very rare mineral and it is mined in certain parts of the world, but most of the metal is obtained from certain silver-bearing minerals, especially sulphides and a chloride.
Nearly all the ores are sulphides of copper (mainly chalcocite) which occur with quartz in a great system of nearly parallel veins in granite of Tertiary Age.
Such calciners are used especially in roasting zinc blende into zinc oxide, and in the conversion of copper sulphides into chlorides in the wet extraction process.
With sulphur it unites at high temperatures, forming sulphurets (sulphides of boron); and when placed in chlorine gas it spontaneously inflames, and a gaseous chloride of boron is formed.
The hydrated sulphides of iron, iron filings, and ferro-cyanide of potassium have also been strongly recommended, and are exhibited in the same way.
The discovery of the singular action of sulphur and the mineral sulphides on caoutchouc was made by Mr Charles Goodyear, of New York, in 1842, at which date the manufacture of vulcanised india rubber may be said to have commenced.
These sulphides form the basis of Balmain's luminous paint.
This precipitate is insoluble in cold dilute acids, in ammonium sulphide, and in solutions of the caustic alkalis, a behaviour which distinguishes it from the yellow sulphides of arsenic and tin.
Defn: That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with but one atom of sulphur in the molecule.
When received the sample had an odour of sulphuretted hydrogen, due to the sulphides present, and a slight pink colour, caused by matter in suspension.
The presence of sulphides is due to the action of reducing organisms on the sulphates.
Boron sulphides and selenides and silicon selenide Detection of Peanut Oil in Olive Oil.
A paper upon the sulphides of boron is communicated by M.
Heated in contact with sulphureted hydrogen, it forms sulphides of boron and phosphorus and hydriodic acid, without liberation of iodine.
When sulphidesor mercaptans in glacial acetic acid solution are heated with permanganate, the resulting sulphonic acid compounds exhibit great similarity to compounds containing free carboxyl groups.
Twenty-five years ago I obtained some rather remarkable results from simply boiling auriferous ferro-sulphides in water.
I have long been of opinion that it is really so held in many of the ferro-sulphides and arsenio-ferro sulphides.
He also included salts of platina and silver in this general law, and demonstrated that solutions of any of these metals traversing a vein rock containing certainsulphides would be decomposed, and the pure metal deposited.
The first six of these sulphides were also operated upon simply in the solution without organic matter, but they remained unaltered.
With regard to auriferous pyritous lodes, it does not appear even now to be clear, as some scientists assert, that their gold is never found in chemical combination with the sulphides of the base metals.
According to Herbert Lang, its most prominent chance of success is in localities where fuel is dear, and the ores contain precious metals and sufficient sulphides and arsenides to render profitable dressing unnecessary.
The following method of assaying is adopted in several large Continental establishments, where the ores have, beside the usual earthy matter and the sulphides of lead, an admixture of zinc, iron, and copper.
The sulphides of tin and cadmium are certainly also yellow, but the latter is quite insoluble in ammonia, while the former gives no metallic sublimate when heated with reducing substances.
The sulphides are best treated with this solvent on the filter; all the sulphides mentioned, save mercury sulphide, dissolve and pass into the filtrate.
Both ammonium and hydric sulphides blacken silver and filter-paper moistened with acetate of lead solution.
The sublimed arsenic itself may not be entirely pure, sometimes containing arsenical sulphides and antimonious oxide.
Afterwards it is once more saturated with hydric sulphide, the precipitate is collected on a filter, well washed, and the sulphidestreated with moderately concentrated nitric acid (1 vol.
It may be boiled in concentrated ClH without solution; but aqua regia, sulphides of potassium and sodium readily dissolve it.
Mercurous Salts= yield black precipitates, with sulphides of ammonium and hydrogen.
The filtrate from the original hydric sulphide precipitate will contain, if present, the sulphides of zinc and chromium in solution.
The chlorides give hydrochloric acid, the sulphides sulphuretted hydrogen and the silicides the hydrogen silicide.
As the surface and the atmosphere above it gradually cooled, the formation of nitrides, and later of hydrides, sulphides and chlorides, occurred.
The fluorides are lowest in the scale, while quartz, corundum, the sulphides and arsenides, are among the highest.
The precious metals and the sulphides of the base metals are rare.
They consist dominantly of the oxide minerals, though in several ore bodies sulphides have been shown by diamond-drilling.
The orange-red sulphides of arsenic, orpiment and realgar, are formed both as primary minerals of igneous source and as secondary products of weathering.
Very commonly the copper sulphides are associated with large quantities of the iron sulphide, pyrite, as well as with varying amounts of lead and zinc sulphides and gold and silver minerals.
For instance, zinc sulphides in the Mississippi valley limestones (pp.
The zinc sulphide is associated with lead, iron, and coppersulphides and gold and silver minerals.
Sulphides of zinc, lead, silver, and other metals are similarly concentrated, in varying degrees.
The source of the primary sulphideshas been a subject of much discussion.
The zone of deposition of secondary sulphidesthus formed is called the zone of secondary sulphide enrichment.
It is associated with quartz and metallic sulphides and is similar in origin to the copper ores of the same district (pp.
The flows carry native copper and copper sulphides in minutely disseminated form and in amygdules, but apparently not in quantities sufficiently concentrated to mine.
These are situated in the basal portions of a great norite intrusive, and are ascribed to segregation of the sulphides as the rock solidified.
The primarysulphides are believed to be genetically related in some fashion to these porphyries.
Sulphuretted hydrogen, recognized by its odour, results from sulphides containing water, and hydrosulphides.
This explains its usefulness, as referred to later, for the titration of strong acids, such as hydrochloric acid, even in the presence of carbonates orsulphides in solution.
Many other minerals may be inclosed in limestones in small quantities, and an exact qualitative analysis will often show the presence of sulphides or sulphates, phosphates, and titanates, and the alkali or even the heavy metals.
These rocks are usually Huronian, and in many places they carry good indications of minerals, copper pyrites and different sulphides of that kind.
This is likewise the case with the sulphides of the alkalies.
Reddened litmus paper is a very sensitive reagent for free alkalies, the carbonates of the alkalies, alkaline earths, sulphides of the alkalies and of the alkaline earths, and alkaline salts with weak acids, such as boracic acid.
A small piece of silver foil is used for the purpose of detecting sulphur and the sulphides of the metals, which impart a dark stain to it.
In blowpipe analysis, we use it particularly to convert sulphides (as those of arsenic, antimony, &c.
If the substances treated with this salt consist of sulphides or arsenides, the bead must be heated on charcoal.
The metallic sulphides are insoluble in borax, and many of the metals in the pure state.
It explains the origin of the Laurentian limestones in consistency with that of similar rocks in the later periods, and in like manner it helps us to account for the graphite and sulphides and iron ores of these old rocks.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sulphides" in a variety of sentences. We hope that you will now be able to make sentences using this word.
