Beryllium sentence example
Beryllium to a certain extent stands alone in many of its chemical' properties, resembling to some extent the metal aluminium.
The old cartridge tags are replaced with gold plated, copper beryllium versions.
The so-called alkaline earth-metals are the elements beryllium, magnesium, calcium, strontium and barium.
Beryllium and magnesium are permanent in dry air; calcium, strontium and barium, however, oxidize rapidly on exposure.
Most of these were simple records of patient and laborious analytical operations, and it is perhaps surprising that among all the substances he analysed he only detected two new elements - beryllium (1798) in beryl and chromium (1797) in a red lead ore from Siberia.Advertisement
Nilson and Pettersson's observations on beryllium and germanium have shown that the atomic heats of these metals increase with rise of temperature, finally becoming constant with a value 5.6.
The name beryllium was given to the metal by German chemists and was generally used until recently, when the earlier name was adopted.
By the same method as had succeeded with aluminium (reduction of the chloride by potassium) Wohler in 1828 obtained metallic beryllium and yttrium.
On concentration of the solution, the major portion of the aluminium present separates as alum, and the mother liquor remaining contains beryllium and iron sulphates together with a little alum.
This is now treated for some days with a hot concentrated solution of ammonium carbonate, which precipitates the iron and aluminium but keeps the beryllium in solution.Advertisement
The iron and aluminium precipitates are filtered off, and the filtrate boiled, when a basic beryllium hydroxide containing a little ferric oxide is precipitated.
To remove the iron, the precipitate is again dissolved in ammonium carbonate and steam is blown through the liquid, when beryllium oxide is precipitated.
Beryllium oxide, beryllia or glucina, BeO, is a very hard white powder which can be melted and distilled in the electric furnace, when it condenses in the form of minute hexagonal crystals.
Beryllium chloride BeC1 2, like aluminium chloride, may be prepared by heating a mixture of the oxide and sugar charcoal in a current of dry chlorine.
This exposure limit will not be reached during the simple use of beryllium metal or Beryllium oxide ceramics.Advertisement
A simple explanation of what is happening You need to think about where the beryllium hydroxide came from in the first place.
Beryllium, unfortunately, is a toxic material, and increasing the Be fraction in the recipe actually depressed the superconductivity transition temperature.
Beryllium is a gray metal that's very light and doesn't tarnish.
The aquamarine is a type of beryl, a mineral made of beryllium aluminum silicate.
Beryllium compounds are almost wholly prepared from beryl.Advertisement
The hydroxide Be(OH)2 separates as a white bulky precipitate on adding a solution of an alkaline hydroxide to a soluble beryllium salt; and like those of aluminium and zinc, this hydroxide is soluble in excess of the alkaline hydroxide, but is reprecipitated on prolonged boiling.
Double sulphates of beryllium and the alkali metals are known, e.g.
Several basic carbonates are known, being formed by the addition of beryllium salts to solutions of the alkaline carbonates; the normal carbonate is prepared by passing a current of carbon dioxide through water containing the basic carbonate in suspension, the solution being filtered and concentrated over sulphuric acid in an atmosphere of carbon dioxide.
Beryllium salts are easily soluble and mostly have a sweetish taste (hence the name Glucinum, from yXv,dc, sweet); they are readily precipitated by alkaline sulphides with formation of the white hydroxide, and may be distinguished from salts of all other metals by the solubility of the oxide in ammonium carbonate.
Beryllium is estimated quantitatively by precipitation with ammonia, and ignition to oxide.Advertisement