It is blue in colour and sublimes readily.
Pure amorphous boron is a chestnut-coloured powder of specific gravity 2.45; it sublimes in the electric arc, is totally unaffected by air at ordinary temperatures, and burns on strong ignition with production of the oxide B 2 0 3 and the nitride BN.
It is decomposed by water, and with a solution of yellow phosphorus in carbon bisulphide it gives a red powder of composition PBI 2, which sublimes in vacuo at 210° C. to red crystals, and when heated in a current of hydrogen loses its iodine and leaves a residue of boron phosphide PB.
It sublimes in small rhombic tables or needles, and is slightly soluble in cold water, the solution possessing an acid reaction.
It sublimes in thin plates of a dark colour and metallic lustre, and is soluble in solutions of the caustic alkalis.
It forms a golden yellow crystalline mass, which sublimes slowly in vacuo, and melts at 25.5° C. It blackens on exposure to moisture, and decomposes when exposed to light.
It sublimes, but on rapid heating decomposes into carbon dioxide and phenol.
It is a crystalline solid, which sublimes at 112°-115° C. It is insoluble in water, and is only slightly soluble in alcohol and ether.
Oliveri, Gazz., 1886, 16, p. 493) It crystallizes in colourless needles which melt at 50° C. It possesses a disagreeable faecal odour, sublimes readily, and turns brown on exposure to air.
When heated in a current of hydrogen it sublimes in the form of brilliant prismatic crystals.
Anthraquinone crystallizes in yellow needles or prisms, which melt at 277° C. It is soluble in hot benzene, sublimes easily, and is very stable towards oxidizing agents.
It melts at about 800°, but sublimes at a lower temperature.
It crystallizes in colourless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water.
It sublimes in golden yellow needles.
The fluoride, CrF3, results on passing hydrofluoric acid over the heated chloride, and sublimes in needles.
So obtained, it is a white crystalline solid, which slowly sublimes just below its melting point 094 0).
It crystallizes in yellow needles which melt at125° C. It sublimes readily, is volatile in steam and reduces to the corresponding dihydroxynaphthalene.
It sublimes readily and is volatile in steam.
It readily sublimes when heated in a current of chlorine, forming golden yellow scales.
The oxide, Yb203, is white and forms colourless salts; the crystallized chloride, YbC1 3.6H 2 0, forms colourless, deliquescent crystals; the anhydrous chloride sublimes on heating (C. Matignon, Ann.
When heated in a vacuum to 530 it sublimes, and on condensation forms microscopic needles.
It is also prepared by the action of iodine on gaseous phosphine, or by heating amorphous phosphorus with concentrated hydriodic acid solution to 160° C. It crystallizes in large cubes and sublimes readily.
It sublimes when heated, but under pressure it melts at 148°, giving a normal vapour density, but on further heating it dissociates into the trichloride and chlorine; this dissociation may be retarded by vapourizing in an atmosphere of chlorine.