See also:

• CYANOGEN (Gr. ebavos, blue 'yevvav, to produce), C2N2

CYANOGEN (Gr. ebavos, See also:

• BLUE (common in different forms to most European languages)

blue 'yevvav, to produce), C2N2  , in See also:

• CHEMISTRY
• CHEMISTRY (formerly "chymistry"; Gr. xvµela; for derivation see ALCHEMY)

chemistry, a See also:

• GAS

gas composed of See also:

• CARBON (symbol C, atomic weight 12)

carbon and See also:

• NITROGEN [symbol N., atomic weight 14.01, 0=16]

nitrogen . The name was suggested by Prussian See also:

• BLUE (common in different forms to most European languages)

blue, the earliest known See also:

• COMPOUND
• COMPOUND (from Lat. componere, to combine or put together)

compound of See also:

• CYANOGEN (Gr. ebavos, blue 'yevvav, to produce), C2N2

cyanogen . It was first isolated in 1815 by J . See also:

• GAY, JOHN (1685-1732)
• GAY, MARIE FRANCOISE SOPHIE (1776-1852)
• GAY, WALTER (1856– )

Gay-Lussac, who obtained it by See also:

• HEATING

heating See also:

• MERCURY
• MERCURY (MERCU1uus)
• MERCURY (symbol Hg, atomic weight = 2oo)

mercury or See also:

• SILVER

silver See also:

• CYANIDE

cyanide; this See also:

• DISCOVERY

discovery is of considerable See also:

• HISTORICAL

historical importance, since it recorded ' the See also:

• ISOLATION

isolation of a " compound See also:

• RADICAL (Lat. radix, a root)

radical." It may also be prepared by heating ammonium oxalate; by passing See also:

• INDUCTION (from Lat. inducere, to lead into; cf. Gr. ilrayu yli)

induction See also:

• SPARKS, JARED (1789-1866)

sparks between carbon points inan See also:

• ATMOSPHERE (Gr. fir µ6r, vapour; orkaipa, a sphere)

atmosphere of nitrogen (see H. von Wartenburg, Abs . J.C.S., 1907, i. p . 299), or by the addition of a concentrated See also:

• SOLUTION (from Lat. solvere, to loosen, dissolve)

solution of See also:

• POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium cyanide to one of See also:

• COPPER (symbol Cu, atomic weight 63.1, H=1, or 63.6, O = 16)

copper sulphate, the mixed solutions being then heated . It also occurs in blast-See also:

• FURNACE

furnace gases . When cyanogen is prepared by heating mercuric cyanide, a See also:

• RESIDUE (through the French, from the Lat. residuum, a remainder, from residere, to remain)

residue known as See also:

• PARA
• PARA (officially BELEM; sometimes BELEM DO PARA)

para-cyanogen, (CN)=, is See also:

• LEFT

left; this is to be regarded as a polymer of cyanogen . It is a brownish amorphous solid, which is insoluble in See also:

• WATER

water . Cyanogen is a colourless gas, possessing a See also:

• PECULIAR

peculiar characteristic See also:

• SMELL (connected etymologically with " smoulder " and " smoke ")

smell, and is very poisonous . It See also:

• BURNS, JOHN (1858– )
• BURNS, ROBERT (1759-1796)
• BURNS, SIR GEORGE

burns with a See also:

• PURPLE

purple See also:

• FLAME (Lat. flamma; the root flag- appears in flagrare, to burn, blaze, and Gr. d, XEryew)

flame, forming carbon dioxide and nitrogen; and may be condensed (by cooling to -25° C.) to a colourless liquid, and further to a solid, which melts at -34.4 C . (M .

See also:

• FARADAY, MICHAEL (1791-1867)

Faraday, See also:

• ANN

Ann., 1845, 56, p, 158) . It dissolves readily in water and the aqueous solution decomposes on See also:

• STANDING

standing; a dark-See also:

• BROWN
• BROWN, CHARLES BROCKDEN (1771-181o)
• BROWN, FORD MADOX (1821-1893)
• BROWN, FRANCIS (1849- )
• BROWN, GEORGE (1818-188o)
• BROWN, HENRY KIRKE (1814-1886)
• BROWN, JACOB (1775–1828)
• BROWN, JOHN (1715–1766)
• BROWN, JOHN (1722-1787)
• BROWN, JOHN (1735–1788)
• BROWN, JOHN (1784–1858)
• BROWN, JOHN (1800-1859)
• BROWN, JOHN (1810—1882)
• BROWN, JOHN GEORGE (1831— )
• BROWN, ROBERT (1773-1858)
• BROWN, SAMUEL MORISON (1817—1856)
• BROWN, SIR GEORGE (1790-1865)
• BROWN, SIR JOHN (1816-1896)
• BROWN, SIR WILLIAM, BART
• BROWN, THOMAS (1663-1704)
• BROWN, THOMAS (1778-1820)
• BROWN, THOMAS EDWARD (1830-1897)
• BROWN, WILLIAM LAURENCE (1755–1830)

brown flocculent precipitate of azulmic See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid, C4H5Ns0, separating whilst ammonium oxalate, See also:

• UREA, or CARBAMIDE, CO(NH2)2

urea and hydrocyanic acid are found in the solution . In many respects it resembles See also:

• CHLORINE (symbol Cl, atomic weight 35`46 (0=16)

chlorine in its chemical behaviour, a circumstance noted by Gay-Lussac; it combines directly with See also:

• HYDROGEN [symbol H, atomic weight x-oo8 (0=16)]

hydrogen (at sod' to 550 C.) to See also:

• FORM (Lat. forma)

form hydrocyanic acid, and with chlorine, See also:

• BROMINE (symbol Br, atomic weight 79-96)

bromine, See also:

• IODINE (symbol I, atomic weight '26.92)

iodine and See also:

• SULPHUR

sulphur, to form cyanogen chloride, &c.; it also combines directly with See also:

• ZINC

zinc, See also:

• CADMIUM (symbol Cd, atomic weight 112.4 (0=16))

cadmium and See also:

• IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron to form cyanides of these metals . It combines with sulphuretted hydrogen, in. the presence of water, to form the compound C2N2•H2S, and in the presence of See also:

• ALCOHOL

alcohol, to form the compound C2N2.2H2S . Concentrated hydrochloric acid converts it into oxamide . Potash solution converts it into a mixture of potassium cyanide and cyanate . When heated with hydriodic acid (specific gravity 1.96) it forms amino-acetic acid, and with See also:

• TIN (Lat.- stannum, whence the chemical symbol " Sn "; atomic weight =117.6, 0=16)

tin and hydrochloric acid it yields See also:

• ETHYLENE, or ETHENE, C2H4

ethylene diamine .