| slovo | definícia |
C2N2
(gcide) | Cyanogen \Cy*an"o*gen\ (s?-?n"?-j?n), n. [Gr. ky`anos a dark
blue substance + -gen: cf. F. cyanog[`e]ne. So called because
it produced blue dyes.] (Chem.)
A colorless, inflammable, poisonous gas, C2N2, with a
peach-blossom odor, so called from its tendency to form blue
compounds; obtained by heating ammonium oxalate, mercuric
cyanide, etc. It is obtained in combination, forming an
alkaline cyanide when nitrogen or a nitrogenous compound is
strongly ignited with carbon and soda or potash. It conducts
itself like a member of the halogen group of elements, and
shows a tendency to form complex compounds. The name is also
applied to the univalent radical, CN (the half molecule of
cyanogen proper), which was one of the first compound
radicals recognized.
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Note: Cyanogen is found in the commercial substances,
potassium cyanide, or prussiate of potash, yellow
prussiate of potash, Prussian blue, Turnbull's blue,
prussic acid, etc.
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| | podobné slovo | definícia |
Ag2C2N2O2
(gcide) | Silver \Sil"ver\ (s[i^]l"v[~e]r), n. [OE. silver, selver,
seolver, AS. seolfor, siolfur, siolufr, silofr, sylofr; akin
to OS. silubar, OFries. selover, D. zilver, LG. sulver, OHG.
silabar, silbar, G. silber, Icel. silfr, Sw. silfver, Dan.
s["o]lv, Goth. silubr, Russ. serebro, Lith. sidabras; of
unknown origin.]
1. (Chem.) A soft white metallic element, sonorous, ductile,
very malleable, and capable of a high degree of polish. It
is found native, and also combined with sulphur, arsenic,
antimony, chlorine, etc., in the minerals argentite,
proustite, pyrargyrite, ceragyrite, etc. Silver is one of
the "noble" metals, so-called, not being easily oxidized,
and is used for coin, jewelry, plate, and a great variety
of articles. Symbol Ag (Argentum). Atomic weight 107.7.
Specific gravity 10.5.
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Note: Silver was known under the name of luna to the ancients
and also to the alchemists. Some of its compounds, as
the halogen salts, are remarkable for the effect of
light upon them, and are used in photography.
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2. Coin made of silver; silver money.
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3. Anything having the luster or appearance of silver.
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4. The color of silver.
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Note: Silver is used in the formation of many compounds of
obvious meaning; as, silver-armed, silver-bright,
silver-buskined, silver-coated, silver-footed,
silver-haired, silver-headed, silver-mantled,
silver-plated, silver-slippered, silver-sounding,
silver-studded, silver-tongued, silver-white. See
Silver, a.
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Black silver (Min.), stephanite; -- called also {brittle
silver ore}, or brittle silver glance.
Fulminating silver. (Chem.)
(a) A black crystalline substance, Ag2O.(NH3)2, obtained
by dissolving silver oxide in aqua ammonia. When dry
it explodes violently on the slightest percussion.
(b) Silver fulminate, a white crystalline substance,
Ag2C2N2O2, obtained by adding alcohol to a solution
of silver nitrate; -- also called {fulminate of
silver}. When dry it is violently explosive.
German silver. (Chem.) See under German.
Gray silver. (Min.) See Freieslebenite.
Horn silver. (Min.) See Cerargyrite.
King's silver. (O. Eng. Law) See Postfine.
Red silver, or Ruby silver. (Min.) See Proustite, and
Pyrargyrite.
Silver beater, one who beats silver into silver leaf or
silver foil.
Silver glance, or Vitreous silver. (Min.) See
Argentine.
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C2N2O2H2
(gcide) | Polymeric \Pol`y*mer"ic\, a. [Poly- + Gr. ? part.] (Chem.)
Having the same percentage composition (that is, having the
same elements united in the same proportion by weight), but
different molecular weights; -- often used with with; thus,
cyanic acid (CNOH), fulminic acid (C2N2O2H2), and
cyanuric acid (C3N3O3H3), are polymeric with each other.
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Note: The figures expressing the number of atoms of each
element in a number of polymeric substances are
respectively multiples and factors of each other, or
have some simple common divisor. The relation may be
merely a numerical one, as in the example given above,
or a chemical one, as in the case of aldehyde,
paraldehyde, and metaldehyde.
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H2C2N2O2
(gcide) | Fulmiaic \Ful*mia"ic\, a. [Cf. F. fulminique.]
Pertaining to fulmination; detonating; specifically (Chem.),
pertaining to, derived from, or denoting, an acid, so called;
as, fulminic acid.
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Fulminic acid (Chem.), a complex acid, H2C2N2O2, isomeric
with cyanic and cyanuric acids, and not known in the free
state, but forming a large class of highly explosive
salts, the fulminates. Of these, mercuric fulminate, the
most common, is used, mixed with niter, to fill percussion
caps, charge cartridges, etc. Fulminic acid is made by the
action of nitric acid on alcohol.
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