The next group precipitate may contain the white gelatinous aluminium hydroxide, the greenish chromium hydroxide, reddish ferric hydroxide, and possibly zinc and manganese hydroxides.
To the filtrate from the aluminium, iron and chromium precipitate, ammonia and ammonium sulphide are added; the precipitate may contain nickel, cobalt, zinc and manganese sulphides.
If phosphoric acid is absent, aluminium, chromium and ferric hydrates are precipitated.
The phosphates of aluminium, chromium and iron are precipitated, and the solution contains the same metals as if phosphoric acid had been absent.
If, however, phosphoric acid is present in the original substance, we may here obtain a precipitate of the phosphates of the remaining metals, together with aluminium, chromium and ferric hydrates.
However, if there is present a third substance capable of oxidation, the chromiumcompound gives up a portion of its oxygen to this substance.
Chromium is a very hard metal of about the same density as iron.
What weight of ferrochromium containing 40% chromium must be added to a ton of steel to produce an alloy containing 1% of chromium?
When ammonium sulphide is added to a solution of a chromium salt, such as the sulphate, chromium hydroxide precipitates instead of the sulphide.
While chromium forms two series of salts, chromous salts are difficult to prepare and are of little importance.
Considerable quantities of an alloy of chromium with iron, called ferrochromium, are now produced for the steel industry.
It will be noticed that the oxidizing action of potassium dichromate leaves potassium sulphate and chromium sulphate as the products of the reaction.
Like manganese, chromium forms two unstable acids, namely, chromic acid and dichromic acid.
This is the best known dichromate, and is the most familiar chromium compound.
A number of the salts of chromium are also used in the dyeing industry, for they hydrolyze like aluminium salts and the hydroxide forms a good mordant.
It is applied in the same manner as alizarin, the chromium mordant being alone employed.
It dyes a dark, somewhat reddish, brown on chromium mordant, the colour being very even and extremely fast to light.
Alizarin Black is dyed on chromium mordant in the same manner as alizarin, and is used as a self-colour or in combination with other Alizarin Colours.
Wool is dyed in a similar manner, sodium sulphate being added to the dyebath, and the dyed colour treated with fluoride of chromium or bichromate of potash.
During this operation the wool at first attracts chromic acid, which is gradually reduced to chromium chromate, so that the mordanted fibre has finally a pale olive-yellow tint.
They are applied in the usual manner on a chromium mordant.
The modern view of their development is that they are part of the sympathetic system, and the reaction of their cells tochromium salts bears this out.
They also serve as substitutes for fustic in wool or silk dyeing, and are dyed either on a chromium mordant, or first in an acid bath and afterwards saddened with bichromate of potash.
Their general dyeing properties are similar, a claret-brown being obtained with chromium mordant, a brownish red with aluminium, a brighter red with tin, and purplish brown with iron.
The silk is steeped for several hours in cold neutral or basic solutions of chromium chloride, alum, ferric sulphate, &c.
Coerulein is employed in dyeing wool, silk or cotton with aluminium or chromium mordants, either as a self-colour or for compound shades.
With aluminium mordant the colour is a moderately bright green, more particularly on silk; with chromium mordant, an olive-green.
Celestine Blue and Chrome Blue dye purplish blue and bright blue respectively, and are dyed in the ordinary way upon a chromium mordant.
In wool-dyeing it is usually applied on chromium mordant for browns and a variety of compound shades in combination with other Alizarin Colours and dyewood extracts, less frequently on aluminium mordant.
A sharp fall in chromium prices reduced hard currency receipts from the mining sector.
A sulphide of chromiumobserved in some meteoric irons.
An element of the chromium group, found in certain rare minerals, as pitchblende, uranite, etc.
A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal.
A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible.
The insoluble trinitrobenzoic acid is filtered off, and carefully washed with cold water until free from chromium salts.
It is then dissolved in 5 per cent sodium hydroxide solution, filtered from any chromium hydroxide remaining, and also from unchanged nitrotoluene.
In order to remove the chromium salts as completely as possible, the crude nitrobenzoic acid is warmed on the water bath and agitated with 1 l.
The amount necessary varies greatly in different runs, according to the manner in which the chromium salts separate.
In transferring the crystals from the reaction flask to the Buchner funnel it is necessary to use a certain amount of water to dissolve the pasty chromium salts which are otherwise quite impossible to filter.
They therefore considered the oxide of chromium to be the coloring agent, without, however, denying the presence of organic matter.
The amount of the oxide of chromium found by many chemists varies from one to two per cent.
They also contain small quantities of nickel and chromium which have been concentrated with the iron.
A solution of recently precipitated hydrated oxide of chromium in liquor of ammonia, diluted with distilled water, q.
All the green dyes in use, with the practically unimportant exception of Chinese green and oxide of chromium green, are compounded of blue and yellow.
The chloride of chromium is again precipitated with carbonate of lime, and by ignition converted into chromate of lime.
A hydrated oxide of chromium forms the emerald green of Pannetier; it is prepared by melting in a crucible equivalent quantities of anhydrous boracic acid and bichromate of potassium, and treating the fused mass with water.
Pass dry chlorine over a mixture of sesquioxide of chromium and charcoal, heated to redness, in a porcelain tube.
Oxide of chromiumfurnishes some which are very beautiful.
The precipitate of the aluminium group may contain aluminium, chromium and ferric hydroxides (possibly traces of manganic hydroxide) and their basic carbonates.
The acid character of aluminium and chromium hydroxides (and even of ferric hydroxide, see p.
Chromium hydroxide, like aluminium hydroxide, is amphoteric; but, in agreement with the greater atomic weight of chromium, it is an even weaker acid than is aluminium hydroxide.
A similar result is obtained when the solution of a chromium salt is treated with a solution of ammonium sulphide.
But ammonium salts do not prevent the precipitation of aluminium, chromium and ferric hydroxides, which are much less soluble than the hydroxides just mentioned, and as much weaker bases, (Chap.
Its sodium salt, sodium chromite, is completely decomposed by boiling water, chromium hydroxide being precipitated in a less hydrated, insoluble form.
Orren was hit a few times but wasn't hurt, the chromium armour protecting him from the blasts.
It looked menacing when it was on his head and especially when he wore his chromium armour with it.
He stood on the wall dressed in his chromium armour and impressive helmet and he stared at Boyce as he stood at the base of the wall in his own majestic armour and helmet.
Chromium and manganese are often used in combination with tungsten when high-speed cutting tools are made.
Chromium forms chrome steel, and with the further addition of nickel is called chrome nickel steel.
Unfortunately, its energy rapidly decreases, and the alteration of the liquid, as well as the large deposit of oxide of chromium that occurs on the positive electrode, prevents its being employed in experiments of quite long duration.
Mr. Grenet, it is true, obviated these two defects by first renewing the liquid slowly and continuously, and causing a current of air to bubble up in the pile so as to detach the oxide of chromium in measure as the deposit formed.
The advantages of chromiumover iodine-131, which has also been used, are that smaller doses are required, and that there is no transfer of radioactivity to the fetal circulation.
When chromium trichloride, CrCl₃, is used as the tagging agent, the chromium is bound almost exclusively to plasma proteins, rather than the red cells.
The same type of computation is carried on for red cells (after correction for a small amount of chromium taken up by the red blood cells).
The labeling is more difficult than labeling with chromium for the same purposes, so this procedure no longer has the importance it once had.
This procedure is easy to carry out because the radioactive chromium chloride is injected directly into a vein.
The amount is found by simple measurement of chromium in the blood that appears in the stools.
Chromium hydroxide is reprecipitated from this solution on boiling.
From the corrected volumes of the two standard solutions, and their relations to normal solutions, calculate the percentage of chromium in the ore.
The tetrahedron is the form of chromium and molybdenum, but not that of the head of their group, oxygen, which is, like hydrogen, sui generis.
The a of beryllium, the b of calcium and strontium, and d of calcium, the e and f of strontium, are all there; j in chromium is the same as the central sphere in the b ovoid.
Another use for the slag from the thermit process in which chromium is used has been discovered.
Another interesting thing about the slag from chromium thermit is that small rubies have been found in it.
Guillaume[64] the temperature at which the magnetic susceptibility of nickel-steel is recovered is lowered by the presence of chromium; a certain alloy containing chromium was not rendered magnetic even by immersion in liquid air.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "chromium" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: gold; iron; lead; metal; silver
