| 单词 | reducing agent |
| 例句 | But the milling did prompt the aluminium to act as a reducing agent, as he expected. Could Grinding Up Lithium Batteries Help Recycle Them? 2023-03-30T04:00:00Z The compounds formed are crystalline, ionic hydrides that contain the hydride anion, H−, a strong reducing agent and a strong base, which reacts vigorously with water and other acids to form hydrogen gas. Chemistry 2019-02-14T00:00:00Z A compound that reduces another is called a reducing agent. Biology for AP Courses 2022-06-09T00:00:00Z "What we do is basically swapping carbon for electricity as a reducing agent," explained Adam Rauwerdink, the company's senior vice president of business development. The race to produce green steel 2022-05-17T04:00:00Z Currently, two main options exist: either heat the components to about 300C to evaporate the lithium, or apply acids and other reducing agents to leach it. The curse of 'white oil': electric vehicles' dirty secret 2020-12-08T05:00:00Z In these approaches, a ‘sacrificial’ reducing agent reduces the excited catalyst molecule produced in the first step, forming a radical anion that is then excited by another photon. Strong chemical reducing agents produced by light 2020-03-31T04:00:00Z Sulfur dioxide also forms when many reducing agents react with hot, concentrated sulfuric acid. Chemistry 2019-02-14T00:00:00Z In the above equation, RH is a reducing agent, and NAD+ is reduced to NADH. Biology for AP Courses 2022-06-09T00:00:00Z February volumes were boosted by the use of drag reducing agents, it said. Exclusive: Lotus Midstream mulls reversing West Texas to Cushing... 2019-08-20T04:00:00Z By contrast, Stanley et al. found that reducing agents did not generate cis-WOOH in their system, whereas exposure to hydrogen peroxide did. Fresh evidence overturns the identification of a factor involved in blood-vessel dilation 2019-02-12T05:00:00Z The resulting excited radical anion is a strong reducing agent. Strong chemical reducing agents produced by light 2020-03-31T04:00:00Z Carbon is a sufficiently strong reducing agent in most cases. Chemistry 2019-02-14T00:00:00Z NAD+ , a reducing agent, can donate its electrons and protons to organic molecules. Biology for AP Courses 2022-06-09T00:00:00Z Step two, the reduction step, can vary from one synthesis to another, and there’s a lot of differences in the reducing agents. The Straight Dope: A Q&A with the Prof Behind the Good Science in Breaking Bad 2013-08-21T13:45:00.533Z By reason of its permanent composition and its richness, it is an excellent substitute for street-gas in incandescent lighting, a good furnace fuel reducing agent. Gas-Engines and Producer-Gas Plants A Practice Treatise Setting Forth the Principles of Gas-Engines and Producer Design, the Selection and Installation of an Engine, Conditions of Perfect Operation, Producer-Gas Engines and Their Possibilities, the Care of Gas-Engines and Producer-Gas Plants, with a Chapter on Volatile Hydrocarbon and Oil Engines 2011-12-28T03:00:31.087Z In any event, it would be a useful reducing agent. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The carbon monoxide serves as the reducing agent in the upper regions of the furnace. Chemistry 2019-02-14T00:00:00Z NAD+ , a reducing agent, can donate its electrons and protons to inorganic molecules. Biology for AP Courses 2022-06-09T00:00:00Z I looked at the other reducing agents and they would, indeed, have been difficult for the actors to the say on the air. The Straight Dope: A Q&A with the Prof Behind the Good Science in Breaking Bad 2013-08-21T13:45:00.533Z It precipitates mercury from a solution of its chloride, and in general acts as a strong reducing agent. Scientific Culture, and Other Essays Second Edition; with Additions 2011-09-17T02:00:31.747Z The sulphides, oxides, etc., could not be obtained without fusing in a furnace with appropriate de-sulphurizing or reducing agents, to which Agricola dimly refers. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z It is easy to oxidize the sulfur in metal sulfides and in hydrogen sulfide, making metal sulfides and H2S good reducing agents. Chemistry 2019-02-14T00:00:00Z Sulphur in iron pyrites also acts as a reducing agent upon litharge, and increases the apparent effect in a similar manner. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z On the other hand, it is readily attacked by reducing agents. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Reducing Action.—All of the hexose sugars are active reducing agents. The Chemistry of Plant Life It is also used in metallurgical operations as a reducing agent, but its application has been diminished by the introduction of coke, anthracite smalls, &c. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Nitric oxide acts both as an oxidizing agent and as a reducing agent. Chemistry 2019-02-14T00:00:00Z The latter, under the influence of mild alkaline reducing agents, is transformed into indigo-blue. Coal and What We Get from It Charcoal is used as a fuel and as a reducing agent in metallurgical processes. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" It is an active reducing agent, being itself easily oxidized to a variety of different products depending upon the strength of the oxidizing agent used and the conditions of the experiment. The Chemistry of Plant Life The stronger argument against the ethylenoid linkages demanded by Kekul�’s formula is provided by the remarkable stability towards oxidizing and reducing agents which characterizes all benzenoid compounds. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Nitrous acid is an active oxidizing agent with strong reducing agents, and strong oxidizing agents oxidize it to nitric acid. Chemistry 2019-02-14T00:00:00Z These are ground to a fine powder under heavy mill-stones, and constitute a most valuable reducing agent, known technically as “iron swarf.” Coal and What We Get from It It is a powerful reducing agent, especially at high temperatures. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" It is found that if the inoculation be made deep down in a solid medium, growth of an anaerobic organism will take place, especially if the medium contains some reducing agent such as glucose. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" I propose to describe how the work is done with zinc dust and lime as reducing agents. Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer Aluminum is a very good reducing agent and may replace other reducing agents in the isolation of certain metals from their oxides. Chemistry 2019-02-14T00:00:00Z The compound is readily prepared by the action of sulphurous acid or any other reducing agent on the quinone. Coal and What We Get from It The suggestion to employ the evaporated extract as a reducing agent in indigo dyeing and printing has also proved unfruitful. Researches on Cellulose 1895-1900 But the nitric acid derivatives of cellulose are not capable of conversion by reducing agents into similar amido compounds. The Dyeing of Cotton Fabrics A Practical Handbook for the Dyer and Student To develop the image the exposed plate is immersed in a solution of some reducing agent called the developer. An Elementary Study of Chemistry Hot ammonia and the ammonium ion are active reducing agents. Chemistry 2019-02-14T00:00:00Z It has long been known in photography, that a developer must be of the nature of a reducing agent, either inorganic or organic, and many hydroxylic and amidic derivatives of hydrocarbons come under this category. Coal and What We Get from It Combining oxidizing agent with reducing agents releases heat. Invaders from the Infinite The remedy has been pointed out in dealing with each kind of vat, and consists essentially in adding to the vat more of the active reducing agent and allowing the vat to rest a while. The Dyeing of Woollen Fabrics This decomposition may be brought about either by heat alone or by the combined action of heat and a reducing agent. An Elementary Study of Chemistry Identify the oxidizing agent, the reducing agent, and the changes in oxidation number that occur in the reaction. Chemistry 2019-02-14T00:00:00Z Now hydroquinone when dissolved in alkali also acts as a reducing agent, and in this we have the first application of a true coal-tar product as a photographic developer. Coal and What We Get from It By reducing agents such, for example, as sulphuretted hydrogen and sulphur-dioxide, it is rapidly converted into hydrobromic acid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In some cases hydrosulphite has proved a useful reducing agent; it can be easily prepared from ordinary bisulphite of soda in the following manner. The Dyeing of Woollen Fabrics Aluminium is frequently employed as a powerful reducing agent, many metallic oxides which resist reduction by carbon being readily reduced by it. An Elementary Study of Chemistry The production and use of iron became much more widespread about 1620, when coke was introduced as the reducing agent. Chemistry 2019-02-14T00:00:00Z Zinc should not be used as a reducing agent preliminary to a "bichromate" titration. A Text-book of Assaying: For the Use of Those Connected with Mines. The blue-green color, which varies in different kinds of glasses, results when the copper is fully oxidized, and the red by preventing oxidation by the presence of a reducing agent. Artificial Light Its Influence upon Civilization For this purpose either energetically reacting, oxidising reducing agents are applied. The Dyeing of Woollen Fabrics In the laboratory zinc is used in the preparation of hydrogen, and in the form of zinc dust as a reducing agent. An Elementary Study of Chemistry It is possible to produce silicon by the high-temperature reduction of silicon dioxide with strong reducing agents, such as carbon and magnesium: Chemistry 2019-02-14T00:00:00Z Sulphides of V and W. Sulphuretted hydrogen is a strong reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. In the Gesner process a current of gasoline vapor is used as the reducing agent. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries By the action of reducing agents the insoluble blue indigo is converted into a soluble white indigo. The Dyeing of Woollen Fabrics It can be prepared, however, by reducing the oxide with aluminium powder or by the use of the electric furnace, with carbon as the reducing agent. An Elementary Study of Chemistry Of these, zinc dust is the only ready product which is, as color or reducing agent, employed in analytical and technical processes. Scientific American Supplement, No. 455, September 20, 1884 It must always be remembered, that the carbonic oxide of the furnace gases is a reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. In the oxidation processes of volumetric analysis standard solutions of oxidizing agents and of reducing agents take the place of the acid and alkali solutions of the neutralization processes already studied. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes C.E., and the author are just now constructing large experimental plant in which water gas will be used as the reducing agent. Scientific American Supplement, No. 531, March 6, 1886 Owing to the slight affinity between iodine and hydrogen the acid easily gives up its hydrogen and is therefore a strong reducing agent. An Elementary Study of Chemistry The examination of zinc dust, when used for the regeneration of metal, determines the quantity of zinc resident therein, and employed as reducing agent, the quantity of metal which causes the generation of hydrogen. Scientific American Supplement, No. 455, September 20, 1884 They are formed by heating the metal or ore in covered crucibles with arsenic and, if necessary, a reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. It is not necessary that the standard should be of 100 per cent purity, provided the content of the active reducing agent is known and no interfering substances are present. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The means which have proved most efficacious in decomposing these bases are the action of oxidizing and reducing agents, of bromine, of organic iodides, of concentrated acids and alkalies, and of heat. Scientific American Supplement, No. 415, December 15, 1883 It has a great affinity for oxygen and is therefore combustible and a good reducing agent. An Elementary Study of Chemistry The exposed plate is then treated with reducing agents, as pyrogallic acid, ferrous sulphate, etc., to develop the latent image. The Gutenberg Webster's Unabridged Dictionary Section P and Q The action of a reducing agent is the separation of the oxygen or sulphur from the metal with which it is combined. A Text-book of Assaying: For the Use of Those Connected with Mines. The reducing agents available are zinc, sulphurous acid, or sulphureted hydrogen. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes C is the most common and important reducing agent, being used for this purpose in smelting iron and other ores, making water-gas, etc. An Introduction to Chemical Science Very strong reducing agents, such as highly heated carbon, can take away half of its oxygen: CO2 + C = 2CO. An Elementary Study of Chemistry To get a button of a desired weight, say 22 grams, we must add reducing agent sufficient to throw down 22 + 16 or 38 grams of lead, which would require 3.4 grams of flour. A Text-book of Assaying: For the Use of Those Connected with Mines. There is no impropriety in describing sulphur as a reducing agent; but it is absurd to call oxygen one. A Text-book of Assaying: For the Use of Those Connected with Mines. The danger here lies in a possible reduction of the phosphate by the carbon of the filter paper, or by the ammonia evolved, which may act as a reducing agent. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes An Oxidizing Agent is a substance that gives up its O to a reducing agent. An Introduction to Chemical Science It can, however, take oxygen away from some other substances, and is therefore a good reducing agent. An Elementary Study of Chemistry With 40 grams of red lead, for example, we should add an excess of reducing agent sufficient to throw down 8 grams of lead instead of 16. A Text-book of Assaying: For the Use of Those Connected with Mines. Fluxes yield slags; reducing agents give buttons of regulus or of metal. A Text-book of Assaying: For the Use of Those Connected with Mines. What is the normal value of the stannous chloride solution as a reducing agent? An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes As usual, heated charcoal is the reducing agent. An Introduction to Chemical Science Solutions of sulphurous acid act as good reducing agents. An Elementary Study of Chemistry Almost any organic substance can be used as a reducing agent, but it is well not to select one which melts, swells up, or gives off much water and gas when heated in the furnace. A Text-book of Assaying: For the Use of Those Connected with Mines. Chromates are reduced to chromic salts by the action of most reducing agents in the presence of an acid; and this property is used in assaying for the volumetric determination of ferrous iron, &c. A Text-book of Assaying: For the Use of Those Connected with Mines. From the following data, calculate the ratio of the nitric acid as an oxidizing agent to the tetroxalate solution as a reducing agent: 1 cc. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It acts in these cases as a reducing agent. An Introduction to Chemical Science The sulphites, like sulphurous acid, have the power of taking up oxygen very readily, and are good reducing agents. An Elementary Study of Chemistry It is used as a reducing agent, and should not be diluted. A Text-book of Assaying: For the Use of Those Connected with Mines. Molybdates are easily reduced, with the production of coloured solutions, by most reducing agents. A Text-book of Assaying: For the Use of Those Connected with Mines. How much water must be added to a liter of the oxalate solution to make it exactly 0.025 N as a reducing agent? An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The reducing agent is either charcoal, anthracite coal, or coke,bituminous coal being too impure. An Introduction to Chemical Science An enormous quantity of carbon in the form of the purer coals, coke, and charcoal is used as a reducing agent in the manufacture of the various metals, especially in the metallurgy of iron. An Elementary Study of Chemistry Potassium Cyanide, KCN.—It is used in the dry assay as a reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. The salts of mercury are volatile, and, if heated with a reducing agent or some body capable of fixing the acid, metallic mercury is given off, which may be condensed and collected. A Text-book of Assaying: For the Use of Those Connected with Mines. Calculate the ratio of tetroxalate to oxalate used in making up the solution and the normal value of the solution as a reducing agent. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes NO is thus called a carrier of O. It is a reducing agent, while NO2 is an oxidizing agent. An Introduction to Chemical Science Carbon in some form is necessary both as a fuel and as a reducing agent. An Elementary Study of Chemistry It is used as a reducing agent, and for providing an atmosphere free from oxygen. A Text-book of Assaying: For the Use of Those Connected with Mines. For oxidised ores, charcoal or tartar is employed as the reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. To what volume must the solution be diluted to make it exactly 0.1 N as a reducing agent? An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes If a reducing agent, i.e. a substance which takes up O, be put into this part of the flame, the latter will remove the O and appropriate it, forming an oxide. An Introduction to Chemical Science Acids, excepting hydrofluoric acid, have little action on it, and it requires the most energetic reducing agents to deprive it of oxygen. An Elementary Study of Chemistry Weigh the buttons of lead obtained, and divide each by the weight of reducing agent used. A Text-book of Assaying: For the Use of Those Connected with Mines. It is used for separating metals from their solutions, and generally as a reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. Red lead, however, contains an excess of oxygen which will use up some of the reducing agent before lead separates out. A Text-book of Assaying: For the Use of Those Connected with Mines. It is a strong reducing agent, and is chiefly used in solution for this purpose. A Text-book of Assaying: For the Use of Those Connected with Mines. That substance which gives up its oxygen is called an oxidizing agent, while the substance which unites with the oxygen is called a reducing agent. An Elementary Study of Chemistry As a reducing agent iron is almost always used, and this is added either in the form of an iron rod, or the crucible itself is made of this metal. A Text-book of Assaying: For the Use of Those Connected with Mines. The charcoal and the iron are reducing agents. A Text-book of Assaying: For the Use of Those Connected with Mines. Sometimes the solution, instead of remaining colourless, gradually develops a blue which recurs in spite of the further addition of the reducing agent. A Text-book of Assaying: For the Use of Those Connected with Mines. Nitrates are best detected and determined by their yielding nitric oxide when treated with sulphuric acid and a suitable reducing agent, such as ferrous sulphate, mercury, or copper. A Text-book of Assaying: For the Use of Those Connected with Mines. The ease with which stannous chloride takes up chlorine to form stannic chloride makes it a good reducing agent in many reactions, changing the higher chlorides of metals to lower ones. An Elementary Study of Chemistry |
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