Sinônimos de gas: Types of gas
acetylenea colourless flammable gas used in the manufacture of organic chemicals and in cutting and welding metals. Formula: C2H2 afterdampa poisonous mixture of gases containing carbon dioxide, carbon monoxide, and nitrogen formed after the explosion of firedamp in coal mines ammoniaa colourless pungent highly soluble gas mainly used in the manufacture of fertilizers, nitric acid, and other nitrogenous compounds, and as a refrigerant and solvent. Formula: NH3 argonan extremely unreactive colourless odourless element of the rare gas series that forms almost 1 per cent (by volume) of the atmosphere. It is used in electric lights. Symbol: Ar; atomic no: 18; atomic wt: 39.948; density: 1.7837 kg/m3; freezing pt: –189.3°C; boiling pt: –185.9°C arsinea colourless poisonous gas used in the manufacture of organic compounds, to dope transistors, and as a military poisonous gas. Formula: AsH3 biogasa gas that is produced by the action of bacteria on organic waste matter: used as a fuel butadienea colourless easily liquefiable flammable gas that polymerizes readily and is used mainly in the manufacture of synthetic rubbers. Formula: CH2:CHCH:CH2 butanea colourless flammable gaseous alkane that exists in two isomeric forms, both of which occur in natural gas. The stable isomer, n-butane, is used mainly in the manufacture of rubber and fuels (such as Calor Gas). Formula: C4H10 butenea pungent colourless gas existing in four isomeric forms, all of which are used in the manufacture of organic compounds. Formula: C4H8 Calor gas(trademark)carbon dioxide or carbonic-acid gasa colourless odourless incombustible gas present in the atmosphere and formed during respiration, the decomposition and combustion of organic compounds, and in the reaction of acids with carbonates: used in carbonated drinks, fire extinguishers, and as dry ice for refrigeration. Formula: CO2 carbon monoxidea colourless odourless poisonous flammable gas formed when carbon compounds burn in insufficient air and produced by the action of steam on hot carbon: used as a reducing agent in metallurgy and as a fuel. Formula: CO chlorinea toxic pungent greenish-yellow gas of the halogen group; the 15th most abundant element in the earth's crust, occurring only in the combined state, mainly in common salt: used in the manufacture of many organic chemicals, in water purification, and as a disinfectant and bleaching agent. Symbol: Cl; atomic no: 17; atomic wt: 35.4527; valency: 1, 3, 5, or 7; density: 3.214 kg/m3; relative density: 1.56; melting pt: –101.03°C; boiling pt: –33.9°C coal gasa mixture of gases produced by the distillation of bituminous coal and used for heating and lighting: consists mainly of hydrogen, methane, and carbon monoxide compressed natural gas (CNG)cyanogenan extremely poisonous colourless flammable gas with an almond-like odour: has been used in chemical warfare. Formula: (CN)2 diazomethanea yellow odourless explosive gas, used as a methylating agent. Formula: CH2:N:N diboranedichlorodifluoromethanea colourless nonflammable gas easily liquefied by pressure: used as a propellant in aerosols and fire extinguishers and as a refrigerant. Formula: CCl2F2 electrolytic gasa mixture of two parts of hydrogen and one part of oxygen by volume, formed by the electrolysis of water ethanea colourless odourless flammable gaseous alkane obtained from natural gas and petroleum: used as a fuel and in the manufacture of organic chemicals. Formula: C2H6 ethylenea colourless flammable gaseous alkene with a sweet odour, obtained from petroleum and natural gas and used in the manufacture of polythene and many other chemicals. Formula: CH2:CH2 flue gasthe smoke in the uptake of a boiler fire: it consists mainly of carbon dioxide, carbon monoxide, and nitrogen fluorinea toxic pungent pale yellow gas of the halogen group that is the most electronegative and reactive of all the elements, occurring principally in fluorspar and cryolite: used in the production of uranium, fluorocarbons, and other chemicals. Symbol: F; atomic no: 9; atomic wt: 18.9984032; valency: 1; density: 1.696 kg/m3; relative density: 1.108; freezing pt: –219.62°C; boiling pt: –188.13°C formaldehydea colourless poisonous irritating gas with a pungent characteristic odour, made by the oxidation of methanol and used as formalin and in the manufacture of synthetic resins. Formula: HCHO heliuma very light nonflammable colourless odourless element that is an inert gas, occurring in certain natural gases: used in balloons and in cryogenic research. Symbol: He; atomic no: 2; atomic wt: 4.002602; density: 0.1785 kg/m3; at normal pressures it is liquid down to absolute zero; melting pt: below –272.2°C; boiling pt: –268.90°C hydrogena flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding. Symbol: H; atomic no: 1; atomic wt: 1.00794; valency: 1; density: 0.08988 kg/m3; melting pt: –259.34°C; boiling pt: –252.87°C hydrogen bromidea colourless pungent gas used in organic synthesis. Formula: HBr hydrogen chloridea colourless pungent corrosive gas obtained by the action of sulphuric acid on sodium chloride: used in making vinyl chloride and other organic chemicals. Formula: HCl hydrogen fluoridea colourless poisonous corrosive gas or liquid made by reaction between calcium fluoride and sulphuric acid: used as a fluorinating agent and catalyst. Formula: HF hydrogen iodidea colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour: used in making iodides. Formula: HI hydrogen sulphidea colourless poisonous soluble flammable gas with an odour of rotten eggs: used as a reagent in chemical analysis. Formula: H2S ketenea colourless irritating toxic gas used as an acetylating agent in organic synthesis. Formula: CH2:CO kryptonlaughing gas or nitrous oxide (LNG)nitrous oxide used as an anesthetic liquefied petroleum gas (LPG)marsh gasa hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air methanea colourless odourless flammable gas, the simplest alkane and the main constituent of natural gas: used as a fuel. Formula: CH4 methylaminea colourless flammable water-soluble gas, used in the manufacture of herbicides, dyes, and drugs. Formula: CH3NH2 methyl bromidea colourless poisonous gas or volatile liquid with an odour resembling that of chloroform, used as a solvent and extinguishant. Formula: CH3Br methyl chloridea colourless gas with an ether-like odour, used as a refrigerant and anaesthetic. Formula: CH3Cl natural gasa gaseous mixture consisting mainly of methane trapped below ground; used extensively as a fuel neona colourless odourless rare gaseous element, an inert gas occurring in trace amounts in the atmosphere: used in illuminated signs and lights. Symbol: Ne; atomic no: 10; atomic wt: 20.1797; valency: 0; density: 0.899 90 kg/m3; melting pt: –248.59°C; boiling pt: –246.08°C nitric oxidea colourless slightly soluble gas forming red fumes of nitrogen dioxide in air. Formula: NO nitrogena colourless odourless relatively unreactive gaseous element that forms 78 per cent (by volume) of the air, occurs in many compounds, and is an essential constituent of proteins and nucleic acids: used in the manufacture of ammonia and other chemicals and as a refrigerant. Symbol: N; atomic no: 7; atomic wt: 14.00674; valency: 3 or 5; density: kg/m3; melting pt: –210.00°C; boiling pt: –195.8°C nitrogen dioxidea red-brown poisonous irritating gas that, at ordinary temperatures, exists in equilibrium with dinitrogen tetroxide. It is an intermediate in the manufacture of nitric acid, a nitrating agent, and also an oxidizer for rocket fuels. Formula: NO2 nitrous oxidea colourless nonflammable slightly soluble gas with a sweet smell: used as an anaesthetic in dentistry and surgery. Formula: N2O oilgasoxygenozonea colourless gas with a chlorine-like odour, formed by an electric discharge in oxygen: a strong oxidizing agent, used in bleaching, sterilizing water, purifying air, etc. Formula: O3; density: 2.14 kg/m3; melting pt: –192°C; boiling pt: –110.51°C phosgenea colourless easily liquefied poisonous gas, carbonyl chloride, with an odour resembling that of new-mown hay: used in chemical warfare as a lethal choking agent and in the manufacture of pesticides, dyes, and polyurethane resins. Formula: COCl2 phosphinea colourless flammable gas that is slightly soluble in water and has a strong fishy odour: used as a pesticide. Formula: PH3 producer gas or air gasa mixture of carbon monoxide and nitrogen produced by passing air over hot coke, used mainly as a fuel propaneradona colourless radioactive element of the rare gas group, the most stable isotope of which, radon-222, is a decay product of radium. It is used as an alpha particle source in radiotherapy. Symbol: Rn; atomic no: 86; half-life of 222Rn: 3.82 days; valency: 0; density: 9.73 kg/m3; melting pt: –71°C; boiling pt: –61.7°C sewage gasgas given off in the digestion of sewage consisting of approximately 66 per cent methane and 34 per cent carbon dioxide stibinea colourless slightly soluble poisonous gas with an offensive odour: made by the action of hydrochloric acid on an alloy of antimony and zinc. Formula: SbH3 synthetic natural gas (SNG)sulphur dioxidea colourless soluble pungent gas produced by burning sulphur. It is both an oxidizing and a reducing agent and is used in the manufacture of sulphuric acid, the preservation of a wide range of foodstuffs (E220), bleaching, and disinfecting. Formula: SO2 synthesis gasa mixture of carbon dioxide, carbon monoxide, and hydrogen formerly made by using water gas and reacting it with steam to enrich the proportion of hydrogen for use in the synthesis of ammonia tail gastetrafluoroethenea dense colourless gas that is polymerized to make polytetrafluorethene (PTFE). Formula: F2C:CF2 tetrafluoroethylenetown gascoal gas manufactured for domestic and industrial use vinyl chloridea colourless flammable gaseous unsaturated compound made by the chlorination of ethylene and used as a refrigerant and in the manufacture of PVC; chloroethylene; chloroethene. Formula: CH:CHCl water gasa mixture of hydrogen and carbon monoxide produced by passing steam over hot carbon, used as a fuel and raw material xenon ▷ See gas
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