Chromic salts are oxidised to chromate by fusion with "fusion mixture" and nitre, or by treating with chlorine in an alkaline solution.
For oxidised ores, charcoal or tartar is employed as the reducing agent.
If the substance contains much iron, the solution is next oxidised by boiling with a little nitric acid; and the iron, alumina, &c.
This method is more especially adapted for the assay of liquors containing much ferric iron and of those oxidised ores which are completely soluble in hydrochloric acid.
It is only when the iron has been oxidisedthat the arsenide of cobalt begins to be attacked; and when the removal of the cobalt is complete, the nickel commences to pass into the slag, the copper being left till last.
But the proportion of sulphur oxidised completely will vary with the conditions of the assay.
The sulphur and arsenic of such minerals as mispickel and pyrites are oxidised by the hot air and pass off as sulphur dioxide and "white arsenic.
This method, which is the one commonly used, is based on the determination of the amount of ferrous iron oxidised by a known weight of the ore.
This sulphide may be oxidised with hydrochloric acid and chlorate of potash; and the selenium separated in the manner described.
With grey copper ores and the oxidised ores, iron pyrites is added.
The antimony is separated as sulphide, redissolved in hydrochloric acid, and oxidised with a crystal of chlorate of potash.
Titanium only occurs as a mineral in its oxidised state, or as titanic oxide (TiO{2}).
When the sulphur exists in the sample received by the assayer in an oxidised state as sulphate, it is usual to report it in terms of sulphuric oxide (SO{3}).
Neither opposes much obstacle to the entry of the rain into the chalk, where any organic impurity which the water may carry in is soon oxidised and rendered harmless.
It is only necessary to reduce the bismuth to powder and expose it for a short time to the air to cause the particles to become so far oxidised as to render them perfectly insulating.
During the period of turning the machine a certain amount of combustible substance was oxidised or burnt in the muscles of my arm.
Special organs which do more work would be more quickly consumed: the heart, for example, if entirely unsustained, would be oxidised in about a week.
The contents of the tube are filtered and washed, the filtrate is oxidised with permanganate, and the nitrogen determined as nitric oxide by the Schultze-Tieman method.
It is partly derived from the sulphur contained in the albuminous compounds, which is oxidised and converted into sulphuric acid during the process of burning the organic matter, and remains in the ash.
Many metallic sulphides (for example, pyrites) are very easily oxidised with access of air and moisture.
Certain substances are oxidised by strong nitric acid so rapidly and with so great an evolution of heat that they deflagrate and burst into flame.
Besides which, sulphurous anhydride acts on such sulphuric acid, being oxidised at the expense of the nitrous anhydride, and forming nitric oxide from it, which again enters into the cycle of action.
Potassium iodide is oxidised by this gas just as it is by ozone (and by peroxide of hydrogen, chromic and other acids, but not by dilute nitric acid nor by sulphuric acid), with the separation of iodine.
Thus nearly all metals and organic substances containing carbon and hydrogen are more or less oxidised when heated with nitric acid.
When copper is oxidised at the expense of the air at the ordinary temperature in the presence of ammonia, oxygen is absorbed, not only for combination with the copper, but also for the formation of nitric acid.
Organic substances are also oxidisedwhen heated with nitre--that is, they burn at the expense of the nitre.
Silver is oxidised by it at the ordinary temperature, whilst oxygen is not able to oxidise silver even at high temperatures; a bright silver plate rapidly turns black (from oxidation) in ozonised oxygen.
Such oxidised metals are found in the earth, and form the majority of metallic ores.
Iodine is directly oxidisedby ozone, but not by oxygen.
Sometimes to distinguish between the degrees of oxidation a change of suffix is made in the oxidised element, -ic oxide denoting the higher degree of oxidation, and -ous oxide the lower degree.
Nitres are formed in the soil when a nitrogenous substance is slowly oxidised in the presence of an alkali by means of the oxygen of the atmosphere.
It will be understood that in consequence of the decomposition, or rather reduction, of chromic acid by organic matter, the latter is also decomposed and oxidised in a corresponding degree.
The oxidised portion of the latter remains soluble and may be entirely removed by treating with warm water.
This arises in consequence of the organic matter being oxidised by the chromic acid, a corresponding decomposition and reduction of the chromate salt to chromate of chromium taking place.
We often find this red paste oxidised on the surface; the coating of green carbonate then gives it the appearance of a richly patinated bronze, the blood-red body only showing when the specimen has been chipped.
Mr Kingzett believes the active properties of the oxidised turpentine oil are due to the formation of monohydrated terpene oxide (C{10}H{16}O.
The baryta is mixed with a portion of hydrate of calcium or of magnesium, and the mixture being placed in an appropriate earthen tube heated to dull redness, is oxidised by passing a current of dry atmospheric air over it.
According to Liebig, they are oxidisedessential oils.
In the preparation of distilled waters for medical purposes the utmost care should be taken to prevent contamination from contact with either copper, lead, or zinc, since these metals are gradually oxidised and dissolved by them.
Silver, iron, copper, when moistened, are oxidisedon the surface immediately at ordinary temperatures by ozone.
Mr Kingzett has shown the incorrectness of Schoenbein's statement that, when oil of turpentine and other essential oils are oxidised by exposure to the air, ozone is formed.
The baryta is then again oxidised by a fresh current of air and deoxidized by steam, and the whole process is repeated as frequently as required.
Schoenbein was misled because from the oxidised oil and the air in its vicinity he obtained the ozone reaction with potassium iodide.
Free exposure to the action of the air, by which the organic matters become oxidised and insoluble, and speedily subside.
Phosphorus is, in like manner, oxidised to phosphoric acid, the quantity of which is determined by precipitation in combination with sesquioxide of iron, or otherwise.
The high appreciation in which ornamental articles in oxidised silver are now held, renders a notice of the process followed interesting.
In this proceeding the reduced lead of the dark spot has been re-oxidised on passing into the hot gases, rich in oxygen, which abound at the point of the flame.
Streaks due to the presence of dirt (as apart from oil or grease contamination, or that due to pieces of oxidised scrap) are unusual, and when they do appear their origin seems to be somewhat of a mystery.
Unless this dark surface were carefully cut off, there would result a crepe containing dark streaks caused by the mixture of the oxidised surface portion with the bulk of the paler coagulum.
Under certain conditions some of the lump rubber darkens rapidly during transport to the store, and any such oxidised portions must be rejected if a uniform colour is to be expected in the crepe.
As a rule the scraps are picked over, and heavily oxidised pieces are sorted out; otherwise the crepe rubber prepared exhibits black streaks.
Metallic alloys are much more easily oxidised than the separate metals, a phenomenon which may be ascribed to the increase of affinity for oxygen which results from the tendency of the one of the oxides to combine with the other.
One of the alloys most useful to the arts is brass; it is more ductile and less easily oxidised than even its copper constituent, notwithstanding the opposite nature of the zinc.
It is merely the highly oxidised sulphate which is decomposed by the astringent; whence it appears, that the sulphate will produce a different effect according to its state of oxidisement, and call for other proportions.
The substances which are thus oxidised in the muscle or in the blood circulating through it, and from which the energy manifested as heat or muscular movement is believed to be derived, may probably be of different kinds.
The oxidised balsam is then washed, first with warm then with cold water, till the washings cease to have an acid reaction.
A red heat fails to volatilise it to any appreciable extent, and it is only slightly oxidised at that temperature; therefore it is not tarnished when exposed to the air.
For example, it is quite certain, from observation, that gelatin cannot take the place of albumen, though its potential energy is little inferior, and it is easily oxidised in the body.
Energy developed by one gramme, or one ounce of the following substances, when oxidisedin the body.
Vogel found that in a normal solution of arsenious acid that had been prepared for using in the above process, half the quantity of the arsenious acid becameoxidised to arsenic acid in the course of about a year.
Thus the ultimate products are phosphoric acid and ferrous chloride, which on exposure to air is oxidised to ferric chloride and oxide.
This body is rather unstable, and on exposure to the air it rapidly becomes oxidised and converted back again into the blue indigo.
When a number of dyeings have been done, it is possible that the vat may become charged with oxidisedindigo and lose its clean, yellow colour.
Nitrites are oxidised by free chlorine and consequently do not interfere with the estimation of it by the thiosulphate method; the influence of ferric salts can be overcome by substituting 3 c.
By the action of ammonia, p-toluene sulphonamide is produced and is subsequently oxidised by bichromate and sulphuric acid to p-sulphonamidobenzoic acid.
An air-blast is injected through the molten mass, and the impurities are burnt, or oxidised as it is chemically termed.
Ammonia, however, can only be oxidised to nitric acid by means of certain powerful oxidising agents, such as ozone or hydrogen peroxide.
This is due to the fact, that there is generally a certain quantity of nitrogen in most soils in a more easily nitrifiable condition than the rest, so that when this becomes oxidised nitrification proceeds more slowly.
It ought not to remain long out of fermenting liquid, nor ought it to be allowed to over-perform its function, for thus having oxidised all the alcohol it will commence oxidation of the vinegar.
Pure iron is not oxidised in the presence of gases and water-vapour only, but for the appearance of rust the presence of water in the liquid state is necessary.
It is regarded as an oxycellulose, being readilyoxidised by exposure to air at 100 deg.
Cellulose is only oxidised to any appreciable extent by acid and alkali if treated under severe conditions.
It is true that the presence of free acid in a paper is most undesirable, as it seriously attacks the cellulose, converting it into an oxidised form.
The presence of the latter is undesirable, since on exposure to air the sulphate of iron produced during the manufacture of the alum is slowly oxidised and turns brown.
If the saving of time be an object, the joint may be twisted together on ordinarily dirty oxidised wires and heated to, say, 200° C.
When taken apart it was found that the tin-foil had oxidised totally and had distributed itself all over the inner surfaces.
Complement (or alexine) is a thermo-labile readily oxidised body present in variable but unalterable amount in the normal serum of every animal.
The Sulphindigotate media are of a blue colour, which during the growth of anaerobic bacteria is oxidised and decolourised to a light yellow.
In addition to the foregoing media, all of which can be, and are employed in the cultivation of anaerobic bacteria, certain special media containing readily oxidised substances are commonly used for this purpose.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "oxidised" in a variety of sentences. We hope that you will now be able to make sentences using this word.
