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  Home >> Chemistry Dictionary >> Cyanide Process or Gold Cyclohexanol

Curing. The process of making natural rubber harder by vulcanization with sulphur forming cross links between polymer chains.

Cyanamide. (1) An inorganic salt containing the ion CN2 -2 See calcium cyanamide.
A colourless crystalline solid, H2NCN, made by the action of carbon dioxide on hot sodamide. It is a weakly acidic compound (the parent acid of cyanamide salts) that is soluble in water and ethanol. It is hydrolysed to urea in acidic solutions.

Cyanic Acid. An unstable explosive acid, HOCN. The compound has the structure H—O—C N, and is also called fulminic acid. Its salts and eaters are cyanates (or fulminates). The compound is a volatile liquid, which readily polymerizes. In water it hydrolyses to ammonia and carbon dioxide. It is isomeric with another acid, H—N = C = O, which is known as isocyanic acid. Its salts and esters are isocyanates.

Cyanide process or Gold. The extraction of gold from its ores by dissolving the gold in a solution of potassium cyanide, reducing the resulting potassium aurocyanide, KAu (CN)2 with zinc, filting off, melting down and cupelling the metal.

Cyanogen or Ethanedintrile (C2N2). A colourless, poisonous gas, very soluble in water. It is combustible and burns with a violet flame to give carbon dioxide and nitrogen.
C2N2 + 2O2  2CO2 + N2

Cyanogen chloride (ClCN). A colourless, poisonous gas, very soluble in water, alcohol and ether.

Cyano group. The group —CN in a chemical compound.

Cyanuric acid. A white crystalline water soluble trimer of cyanic acid, (HNCO)3.

Cyclo pentane (C5H10). A colourless liquid, b.p. 49.2°C, prepared from petroleum. It is used as a solvent.

Cyclic compound. A compound having a ring of atoms. In case the compound contains all the same atoms then it is called homocyclic and if different atoms, then it is called hetrocyclic.

Cyclization. A reaction in which a straight chain compound is changed into a cyclic compound.

Cyclobutane or Tetramethylene. (C4H8). A colourless, pleasant smelling gas (b.p. 258k). It is more stable than cyclopropane. It is obtained by reduction of cyclobutene with hydrogen in the presence of nickel
at 375k.

Cyclohexane. (C6H12) A colourless liquid obtained by the reduction of benzene with hydrogen in the presence of nickel at 200°C. It is used as a solvent.

Cyclenes.
Cyclic hydrocarbons containing one or more double bonds.

Cyclic. Compounds which contain a closed ring system, such as the cyclohexane ring, as opposed to the open chain aliphatic compounds.

Cyclohexanol. Hexalin, hexahydrophenol. C6H11 (OH), C6H12O. Colourless liquid; m.p. 24°C, b.p. 161°C. Manufactured by heating phenol with hydrogen under pressure in the presence of suitable catalysts.

Oxidized to adipic acid (main use as intermediate for nylon production); dehydrogenated to cyclohexanone. Dehydrated (e.g. AlCl3) to cyclohexane. Used in the manufacture of celluloid, esters (plasticizers), and printing inks.
Cyclonite. An explosive, which obtained by nitrating methenamine with concentrated HNO3. Used in detonators, artillery shells and for blasting.
Cytidine. A nucleoside which is comprising one cytosine molecule linked to a D-ribose sugar molecule.
Cytosine. 2-oxy-4-aminopyrimidine, C4H5N3O. A hydrolysis product of nucleic acids.
Cytotoxic agents. Chemicals injurious to living cells. The term is applied particularly with respect to tumour formation. Many cytotoxic agents are bifunctional alkylating agents, e.g. mustard gas, nitrogen mustards.

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