| 单词 | anhydride |
| 例句 | Most nonmetal oxides are acid anhydrides, meaning that they react with water to form acidic solutions. Chemistry 2019-02-14T00:00:00Z In the first step, a Diels–Alder reaction involving an anhydride or ester builds a 3D molecular scaffold. Reaction combination opens up 3D molecular diversity for drug discovery 2018-08-05T04:00:00Z Gradually, water vapour from the air hydrolysed the polymer’s anhydride groups, causing decomposition of the film. Self-Destructing Circuits Mimic Mission: Impossible Tape 2017-09-08T04:00:00Z In the old chemistry the name acid was applied to the oxides of the negative or nonmetallic elements, now sometimes called anhydrides. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z By long heating the acid is converted into its anhydride, which, however, is obtained more readily by heating the silver salt of the acid with acetyl chloride. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z Most metals oxides are base anhydrides and react with acids. Chemistry 2019-02-14T00:00:00Z This distinguished chemist had noticed that a bubble of air separated by a film of water from an atmosphere of carbonic anhydride gradually expanded until it burst. Scientific Culture, and Other Essays Second Edition; with Additions 2011-09-17T02:00:31.747Z The decomposition time could be varied from days to weeks and potentially even longer by altering the polymer’s anhydride content and the humidity. Self-Destructing Circuits Mimic Mission: Impossible Tape 2017-09-08T04:00:00Z Acidulous mineral waters, such as contain carbonic anhydride. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z It sublimes to some extent at about 200� C., being partially converted into maleic anhydride and water, the reaction becoming practically quantitative if dehydrating agents be used. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Nearly all of the nonmetal oxides are acid anhydrides. Chemistry 2019-02-14T00:00:00Z A vacuum is created and then flooded with a liquid called acetic anhydride - effectively industrial vinegar - which is sucked into the spaces in the wood. Rice house 2011-05-06T10:19:08Z Meanwhile, convection inside the droplets brought fresh supplies of oleic anhydride to the surface. Oil droplets mimic early life 2011-02-23T19:15:02.307Z Thilorier was killed by the explosion of a vessel of liquefied carbonic anhydride; Dulong lost an eye and finger, and Sir Humphrey Davy was wounded by an explosion of chloride of nitrogen. The Scientific Basis of National Progress Including that of Morality 2010-12-30T03:00:25.567Z It crystallizes in monoclinic prisms, which are easily soluble in water, melt at 130� C., and boil at 160� C., decomposing into water and maleic anhydride. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Most other metal oxides are insoluble and do not form hydroxides in water; however, they are still base anhydrides because they will react with acids. Chemistry 2019-02-14T00:00:00Z It is heated to start the reaction, and when it is complete the resins, residual acetic anhydride and acetic acid are wicked away from the wood, and the pine has become Accoya. Rice house 2011-05-06T10:19:08Z It is not necessary to filter the solution of the melt in this case, but sufficient time must be allowed for the hydrolysis of the anhydride before proceeding with the neutralization. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. This compound on heating with phosphoric anhydride loses water and yields anthraquinone, It may be prepared in a similar manner by heating phthalyl chloride with benzene in the presence of aluminium chloride. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Maleic anhydride is obtained by distilling fumaric acid with phosphorus pentoxide. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Coumarin, the anhydride of cinnamic acid,; is an example of an acid substance which is classed as an essential oil, even though it is a solid at ordinary temperatures. The Chemistry of Plant Life Jute reacts with nitric acid in presence of sulphuric acid to form nitrates; and with acetic anhydride to form low acetates. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" This gives the total acidity due to free acetic acid and acid formed from the anhydride. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. It is prepared by heating gallic acid with benzoic and sulphuric acids, or with phthalic anhydride and zinc chloride, and is a brown dye known as “anthragallol” or “anthracene-brown.” Coal and What We Get from It It can also be prepared by heating a mixture of phenol and malic acid with sulphuric acid, or by passing bromine vapour at 107� C. over the anhydride of melilotic acid. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" I pretend to understand all about sulphuric anhydride, and carbon dioxide, and 127 degrees Fahrenheit, but do not really know if there are things which should be remembered or forgotten. Seeds of Pine Cellulose reacts directly with acetic anhydride to form low esters; in the presence of sulphuric acid the reaction proceeds to higher limits; the triacetate is soluble in chloroform. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" Then add anhydrous sodium acetate and acetic anhydride in the usual amounts and proceed as described in the regular analysis. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Baeyer, the eminent chemist who subsequently synthesised indigo, published the first of a series of investigations describing the compounds produced by heating phthalic anhydride with phenols. Coal and What We Get from It It cannot be converted into coumarin by heating alone, but it is readily transformed on heating with acetic anhydride or acetyl chloride. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" As before, only true ring nuclei, and not internal anhydrides of aliphatic compounds, will be mentioned. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Of the hygroscopic substances in common use, phosphoric anhydride, concentrated sulphuric acid, and dry potassium hydrate are almost equal in power; sodium hydrate and calcium chloride are not much behind. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 "Demijohn" to "Destructor" Let stand with occasional shaking, for several hours, to permit the hydrolysis of all the anhydride; then dilute to about 200 cc., add phenolphthalein and titrate with N/1 NaOH. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. The phthaleïn formed from gallic acid and phthalic anhydride really results from the union of the latter with pyrogallol. Coal and What We Get from It This compound, soluble in acetic anhydride, was boiled with it for six hours after adding fused sodium acetate, and the product separated by pouring into water. Researches on Cellulose 1895-1900 A notable example is provided by the phthaleins, which result by the condensation of phthalic anhydride with phenols. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" In a complete analysis, the figure for fatty acids should be converted into terms of fatty anhydrides by multiplying by the factor 0.9875. The Handbook of Soap Manufacture Add about 3 grams of the anhydrous sodium acetate, then 7.5 cc. of the acetic anhydride, and connect the flask with an upright Liebig condenser. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. The metallic oxide combines with this excess of acid anhydride, forming a mixed salt of metaboric acid. An Elementary Study of Chemistry The lignone group as it exists in the lignocellulose has no free OH groups, and probably no free aldehydic groups such as would react with the anhydride. Researches on Cellulose 1895-1900 Fowler's solution is the best-known medicinal preparation of arsenic, and contains 1 grain of arsenious anhydride in 110 minims. Aids to Forensic Medicine and Toxicology Concentrated sulphuric acid with the aid of heat attacks the metal very slightly, evolving sulphurous anhydride. Scientific American Supplement, No. 365, December 30, 1882 It is worthy of note that in the presence of much free anhydride a compound is formed with phenolphthalein, soluble in alkali and acetic acid, but insoluble in neutral solutions. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. The silicon and carbon burn, followed by the phosphorus and sulphur, and the anhydrides of acids so formed combine with the basic oxides of the lining, forming a slag. An Elementary Study of Chemistry They also lay stress upon the superior stability of the nitrates of the anhydrides, especially of the ketoses. Researches on Cellulose 1895-1900 It will be found advantageous, however, during the preparation of sulphurous anhydride, to employ a layer of water covering the bottom of the vessel to about 1 inch in depth. Scientific American Supplement, No. 633, February 18, 1888 The chemical name of this product is "polymerized oxybenzyl methylene glycol anhydride," but nobody calls it that, not even chemists. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The anhydride may be tested for strength by the following method: Into a weighed stoppered vessel, containing 10 to 20 cc. of water, run about 2 cc. of the anhydride, replace the stopper and weigh. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Like most of the oxides of the non-metallic elements, carbon dioxide is an acid anhydride. An Elementary Study of Chemistry Saccharin possesses very decided acid properties, and combines readily with alkalies or alkaline carbonates, forming anhydro-ortho sulphamine-benzoates of the same, in the latter case at the expense of the carbonic anhydride, causing strong effervescence. Scientific American Supplement, No. 620, November 19,1887 Having had occasion to prepare a quantity of sulphurous anhydride, for the purpose of reducing chromates previous to their analysis, I made use of the following apparatus, as represented in the accompanying figure. Scientific American Supplement, No. 633, February 18, 1888 It corresponds approximately to the weight of the carbonic anhydride present in the potassium carbonate. Scientific American Supplement, No. 441, June 14, 1884. If a rubber stopper is used it should have had a preliminary treatment with hot acetic anhydride vapor. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. It is the anhydride of an acid, and consequently it dissolves in fused alkalis to form silicates. An Elementary Study of Chemistry When slightly warmed in oxygen it inflames, the combustion being rendered very beautiful by the fumes of boric and phosphoric anhydrides and the violet vapors of iodine. Scientific American Supplement, No. 841, February 13, 1892 Phosphoric anhydride, when heated to low redness, burns with a pale flame in fluorine, forming a gaseous mixture of fluorides and oxyfluoride of phosphorus. Scientific American Supplement, No. 832, December 12, 1891 In twenty-four hours a small concentrating plant was erected, and a ditch made to drain off the carbonic anhydride in the valley. The Wings of the Morning When treated under pressure with three times its weight of acetic anhydride at 130-140° it dissolves perfectly. Scientific American Supplement, No. 455, September 20, 1884 In view of the close relation between these oxides and the corresponding acids, they are called anhydrides of the acids, N2O3 being nitrous anhydride and N2O5 nitric anhydride. An Elementary Study of Chemistry The composition of the gaseous residue present does not affect phosphorescence; thus, the earth yttria phosphoresces well in the residual vacua of atmospherical air, of oxygen, nitrogen, carbonic anhydride, hydrogen, iodine, sulphur and mercury. Scientific American Supplement, No. 795, March 28, 1891 Boric anhydride is raised to a most vivid incandescence by fluorine, the experiment being rendered very beautiful by the abundant white fumes of the trifluoride which are liberated. Scientific American Supplement, No. 832, December 12, 1891 Whatever the character of the compound may be, it has been shown that it loses sulphuric anhydride upon ignition, causing low results, even though the precipitate contains iron. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes In "Miller's Chemistry" it is stated it "may be obtained by boiling solutions of arsenious anhydride and cupric acetate, and adding to the mixture an equal bulk of cold water." Scientific American Supplement, No. 455, September 20, 1884 DEFINITION: Any oxide which will combine with water to form an acid, or which together with water is formed by the decomposition of an acid, is called an anhydride of that acid. An Elementary Study of Chemistry This refrigerator is like those which we employ in our sulphurous anhydride frigorific apparatus. Scientific American Supplement, No. 299, September 24, 1881 Immediately it comes in contact with atmospheric moisture phosphoric anhydride is converted into phosphoric acid, but this also occurs at first as a solid substance. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power The oxygen escapes and the anhydrides, reacting with water, re-form nitric and sulphuric acids. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Its most important compound is As2O3, arsenic trioxide, called also arsenious anhydride, arsenious acid, white arsenic, etc. An Introduction to Chemical Science The product of this reaction is sulphuric acid, so that sulphur trioxide is the anhydride of that acid: SO3 + H2O = H2SO4. An Elementary Study of Chemistry Phthalimide may also be made by using 500 g. of phthalic anhydride and 500 g. of ammonium carbonate which has been previously ground in a mortar. Organic Syntheses When a gas containing phosphorus is burnt beneath such a mantle, the phosphoric anhydride attacks those oxides, partially converting them into the respective phosphates, and these bodies are less refractory. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power A sample of apatite weighing 0.60 gram is analyzed for its phosphoric anhydride content. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Show how the respective acid formulae are obtained from these anhydrides. An Introduction to Chemical Science To understand the reaction which occurs, it must be remembered that a volatile acid anhydride is expelled from its salts when heated with an anhydride which is not volatile. An Elementary Study of Chemistry Notes Several smaller runs of 25 g. of phthalic anhydride gave the same percentage yield. Organic Syntheses As the phosphoric anhydride, or pentoxide, which is produced when a gas containing phosphorus burns, is a solid body, it may be deposited at the burner jets. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power The reason that metallic oxides dissolve in borax is that borax contains an excess of acid anhydride, as can be more easily seen if its formula is written 2NaBO2 + B2O3. An Elementary Study of Chemistry Oxidation in the Human System.—Carbon dioxide, or carbonic anhydride, carbonic acid, etc., An Introduction to Chemical Science Like the corresponding oxides of phosphorus, the oxides of arsenic are acid anhydrides. An Elementary Study of Chemistry Carbonic acid is very unstable, however, and decomposes into its anhydride, CO2, and water, thus: H2CO3 = H2O + CO2. An Elementary Study of Chemistry Sulphur is objectionable in acetylene because it is converted into sulphurous and sulphuric anhydrides, or their respective acids, as it passes through the flame. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power The iron is soon melted by the flame directed upon it, and the sulphur, phosphorus, and silicon are oxidized by the iron oxide, forming oxides which are anhydrides of acids. An Elementary Study of Chemistry Phosphorus is objectionable because in similar circumstances it produces phosphoric anhydride and phosphoric acid. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power |
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