| 单词 | alkaline earth |
| 例句 | The only result that popped up pertained to chemistry: specifically, to the periodic table and the atomic numbers of the alkaline earth metals. What Number Comes Next? The Encyclopedia of Integer Sequences Knows. 2023-05-21T04:00:00Z In contrast, the alkaline earth metals have a completed s subshell in their outermost shell. Chemistry 2019-02-14T00:00:00Z A silvery, alkaline earth metal called strontium comes in different versions, or isotopes, each with a different atomic mass. Mammoth Tusk Analysis Reveals Epic Lifetime Journey around Alaska 2021-09-09T04:00:00Z Liu, Y., Merinov, B. V. & Goddard, W. A. Origin of low sodium capacity in graphite and generally weak substrate binding of Na and Mg among alkali and alkaline earth metals. Monolayer atomic crystal molecular superlattices 2018-03-06T05:00:00Z It is difficult to see what the chemical similarity between helium and alkaline earth metals is, however. Readers Respond to "Quantum Weirdness" 2013-09-21T11:15:00.690Z Optical lattice clocks with alkaline earth atoms provide one of the most stable time-keeping systems. [Report] A Quantum Many-Body Spin System in an Optical Lattice Clock 2013-08-09T19:26:39.613Z Active metals such as the alkali metals and alkaline earth metals can reduce nitrogen to form metal nitrides. Chemistry 2019-02-14T00:00:00Z Specifically, I look at novel catalytic transformations using the cheap and environmentally friendly metals of group 2 alkaline earth metals such as magnesium. 30 under 30: Transforming Metals and Brewing Beer 2013-06-21T20:15:00.327Z One of the elements, belonging to the alkaline earth group; a metal having a silverÐwhite color, and melting at a very high temperature. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z In that chart, helium is placed above the alkaline earth elements, contrary to its usual position as a member of the noble gases family in conventional tables. Readers Respond to "Quantum Weirdness" 2013-09-21T11:15:00.690Z In common with Gay Lussac and Davy, he held subterraneous thermic disturbances to be probably due to the contact of water with metals of the alkalis and alkaline earths. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 9 "Dagupan" to "David" 2012-02-11T03:03:39.807Z How do alkali metals differ from alkaline earth metals in atomic structure and general properties? Chemistry 2019-02-14T00:00:00Z The distinction at first drawn between "earth" and "alkali" was too absolute; the intermediate group of "alkaline earths" served to bridge over the gap between the extreme groups. Heroes of Science Chemists 2011-12-09T03:00:21.047Z The discovery of electrolytic hypochlorites dates back to 1859, when Watt found that chlorides of the fixed alkalies and alkaline earths yielded hypochlorites on being submitted to the action of an electrical current. Chlorination of Water 2011-09-13T02:00:32.243Z Lime is also sometimes employed for the same purpose; and indeed any earth would operate as a flux to the scoriaceous part of the lead-ashes, if added in a due proportion, particularly the alkaline earths. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z In chemistry the term earth is given to certain metallic oxides, such as the 'alkaline earths' lime, baryta, and strontia; also to alumina and a series known as the 'rare earths'. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z The driving force for such oxidations is similar to that of alkaline earth metals such as Be or Mg, forming Be2+ and Mg2+. Chemistry 2019-02-14T00:00:00Z The introduction is divided into five parts as follows: Part I.—The influence of alkalies and alkaline earths on the constituents of cane juice. The Philippine Agricultural Review Vol. VIII, First Quarter, 1915 No. 1 2011-04-13T02:00:12.527Z The fluorides of the alkali metals, of silver, and of most of the heavy metals are soluble in water; those of the alkaline earths are insoluble. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z It has already been pointed out that Lavoisier considered the alkalis and the alkaline earths as elements, because in his time they had not been decomposed. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z These salts are not only those formed by the alkali metals, sodium and potassium, but also those formed by the heavy metals and alkaline earths. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. In general, the alkali metals react faster and are more reactive than the corresponding alkaline earth metals in the same period. Chemistry 2019-02-14T00:00:00Z It is precipitated as the metal from solutions of its salts by the metals of the alkalis and alkaline earths, zinc, iron, copper, &c. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1 "Bisharin" to "Bohea" Having now given the principal reactions for the most important metals, we will proceed to the examination of the alkali metals, the alkaline earths, and some of the acid elements. The Elements of Blowpipe Analysis From several scientific experiments which he made upon this substance, he deduced, "1st, That this concrete is not an alkaline earth, as it is not affected either by the vitriolic or vegetable acids. " Niagara An Aboriginal Center of Trade The citrates are a numerous class of salts, the most soluble of which are those of the alkaline metals; the citrates of the alkaline earth metals are insoluble. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" The group 12 elements behave more like the alkaline earth metals than transition metals. Chemistry 2019-02-14T00:00:00Z They consist of silica and alumina, along with various other substances, chiefly alkalies and alkaline earths. Manures and the principles of manuring If there be any, it is this: In its crudest state the alkaline earth of the Desert is sufficiently pure to make violent effervesence with acids. The Atlantic Monthly, Volume 14, No. 85, November, 1864 Magnesia, a light and white alkaline earth, which enters into the composition of many rocks, communicating to them a greasy or soapy feeling, and a striped texture, with sometimes a greenish color. A Treatise on Domestic Economy For the Use of Young Ladies at Home and at School In its chemical properties it closely resembles barium and strontium, and to some degree magnesium; these four elements comprise the so-called metals of the "alkaline earths." Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Although they are insoluble in pure water, alkaline earth carbonates dissolve readily in water containing carbon dioxide because hydrogen carbonate salts form. Chemistry 2019-02-14T00:00:00Z The main mass of the rocks consists of silica, and this is generally combined with alumina, as in clay, forming aluminium silicate, and with the commoner alkalies and alkaline earths. Manures and the principles of manuring Similarly, good mild ale waters should contain a certain quantity of sodium chloride, and waters for stout very little mineral matter, excepting perhaps the carbonates of the alkaline earths, which are precipitated on boiling. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The heated surface was in places incrusted with alkaline earth worn into ash-like dust, or paved with pebbles blistering hot to the feet. Historical Tales - The Romance of Reality - Volume III Lime is distinguished from the other alkaline earths by forming a sulphate insoluble in dilute alcohol, but completely soluble in a boiling solution of ammonium sulphate. A Text-book of Assaying: For the Use of Those Connected with Mines. Hydrogen carbonates of the alkaline earth metals remain stable only in solution; evaporation of the solution produces the carbonate. Chemistry 2019-02-14T00:00:00Z Thomsen has found that the heat of neutralization of the soluble bases of the alkalies and alkaline earths with sulphuric acid has a mean value of 31.150 c. within very narrow limits. Scientific American Supplement, No. 561, October 2, 1886 The beads of some substances, for instance those of the alkaline earths, are clear while hot; but upon cooling, are milk-white and enamelled. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Sulphides of the alkalies and alkaline earths are also immediately rendered incandescent, fluorides of the metal and sulphur being respectively formed. Scientific American Supplement, No. 832, December 12, 1891 The reactions of the lithium compounds lie between those of the alkalies and of the alkaline earths. A Text-book of Assaying: For the Use of Those Connected with Mines. Zinc and cadmium have lower reduction potentials than hydrogen, and, like the alkali metals and alkaline earth metals, they will produce hydrogen gas when they react with acids. Chemistry 2019-02-14T00:00:00Z It must have been quiescent for some time and then the thin skin of alkaline earth formed over it. The Boy Inventors' Radio Telephone These substances are particularly the silicates and the sulphates of the alkaline earths. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Carbonic acid readily betrays its presence through solutions of the alkaline earths such as baryta and chalk, in which its passage produces an insoluble carbonate, and consequently makes the liquid turbid. Scientific American Supplement, No. 460, October 25, 1884 Salts of the following metals are soluble in an ammoniacal solution in the presence of ammonic chloride:—copper, cadmium, silver, nickel, cobalt, manganese, zinc, magnesium, sodium, potassium, and the alkaline earths. A Text-book of Assaying: For the Use of Those Connected with Mines. Because of this charge increase, the atoms of the alkaline earth metals are smaller and have higher first ionization energies than the alkali metals within the same period. Chemistry 2019-02-14T00:00:00Z It is a member of the alkaline earth group of elements. The Gutenberg Webster's Unabridged Dictionary Section C Go to TOC In the pure state, the alkaline earths are caustic, cause red litmus paper to become blue, and are more or less soluble in water. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations It has been repeatedly observed that iron does not rust in water in which are dissolved small quantities of caustic alkalies or alkaline earths, which neutralize every trace of acid. Scientific American Supplement, No. 392, July 7, 1883 Magnesia differs from the other alkaline earths by the solubility of its sulphate in water. A Text-book of Assaying: For the Use of Those Connected with Mines. The higher ionization energy makes the alkaline earth metals less reactive than the alkali metals; however, they are still very reactive elements. Chemistry 2019-02-14T00:00:00Z Magnesia: A light and white alkaline earth, which enters into the composition of many rocks, communicating to them a greasy or soapy feeling and a striped texture, with sometimes a greenish color. American Woman's Home The carbonates and phosphates of the alkaline earths are insoluble in water. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations The plant receives, by means of this water, at the time of its first development, the alkalies, alkaline earths, and phosphates, necessary to its organization. Familiar Letters on Chemistry The alkaline earth metals occur as silicates and, with the exception of beryllium, as carbonates and sulfates. Chemistry 2019-02-14T00:00:00Z Like the alkali metals, the heavier alkaline earth metals impart color to a flame. Chemistry 2019-02-14T00:00:00Z Sulphuret: A combination of an alkaline earth or metal with sulphur, as Sulphuret of iron, a combination of iron and sulphur. American Woman's Home By igniting the carbonates, their carbonic acid is expelled, and the alkaline earths are left in the caustic state. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations An atom of the alkaline earth metal beryllium, with an atomic number of 4, contains four protons in the nucleus and four electrons surrounding the nucleus. Chemistry 2019-02-14T00:00:00Z Magnesium is in seawater and, along with the heavier alkaline earth metals, occurs as silicates, carbonates, and sulfates. Chemistry 2019-02-14T00:00:00Z Unlike most salts of the alkali metals, many of the common salts of the alkaline earth metals are insoluble in water because of the high lattice energies of these compounds, containing a divalent metal ion. Chemistry 2019-02-14T00:00:00Z The hydrate and the salts of lime are in their properties similar to those of the two preceding alkaline earths. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations |
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