| 词汇 | example_english_alkali-metal |
| 释义 | Examples of alkali metalThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. These sources work by applying a layer of alkalimetal atoms on a low work function substrate, usually tungsten. The technique coats a tungsten plug with aluminosilicate doped with an alkalimetal, which is then sintered onto the tungsten. These alkalimetal heat pipes transferred heat from the heat source to a thermionic or thermoelectric converter to generate electricity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. From this acid other alkalimetal salts can be prepared. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Saltiness and sourness are perceived when alkalimetal or hydrogen ions enter taste buds, respectively. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As a hydride of an alkalimetal, it is reactive towards even weak oxidizing agents. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkalimetal peroxides and superoxides are powerful oxidizing agents. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This natural radioactivity became a basis for a mistaken claim of the discovery for element 87 (the next alkalimetal after caesium) in 1925. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hence, the larger alkalimetal atoms (further down the group) will be less electronegative as the bonding pair is less strongly attracted towards them. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All of the alkalimetal fluorides, and most of the alkali earth metal fluorides are true salts. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When alkalimetal cyanides are used, at least partial neutralization of the reaction medium is usually necessary to provide desired products. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The number of states of rare gas halides is greater than that of alkalimetal salts. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The radius increases sharply between the noble gas at the end of each period and the alkalimetal at the beginning of the next period. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkalimetal magnetometer is very expensive to use but it is very sensitive and has fast cycles when it is used. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Inducing n-type doping within the silicene structure requires an alkalimetal dopant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Niobates are generated by dissolving the pentoxide in basic hydroxide solutions or by melting it in alkalimetal oxides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The base is an amine, sodium hydroxide, an organolithium reagent or an alkalimetal alloy such as sodium/potassium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The cations are mostly of the alkalimetal group. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkalimetal peroxides can be used for the synthesis of organic peroxides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In this reaction, an electron is transferred from the alkalimetal to naphthalene. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Caesium is an alkalimetal and has physical and chemical properties similar to those of rubidium and potassium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is used as such in some industrial dyeing processes, where an otherwise water-insoluble dye can be reduced into a water-soluble alkalimetal salt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Selenium and an alkalimetal react to initially give white, sparingly soluble solids like monoselenides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has been shown that antamanide can react to form alkalimetal ion complexes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The angular momentum is transferred from the alkalimetal electrons to the noble gas nuclei through collisions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkalimetal carbonites obtained in the cryogenic experiments decomposed to the corresponding carbonate (with release of carbon monoxide) or oxalate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The complexation depends on halide ion numbers, atomic number of the alkalimetal, the halide of which is added, temperature and solution ionic strength. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkalimetal salts of this trianion are superconducting. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A typical school demonstration demonstrates what happens when a piece of an alkalimetal is introduced to a bowl of water. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkylation of alkalimetal di- and polysulfides gives disulfides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Decomposition of concrete and volatilization of the alkalimetal compounds consumes a substantial amount of heat. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is a soft, silver-white metal belonging to the alkalimetal group of chemical elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The resulting alkalimetal derivatives can react in two ways. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkalimetal salts decrease in stability down the group. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkynylalanes are less commonly used because alkalimetal acetylides can be used for many of the same transformations as alkynylalanes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In general, alums are easier formed when the alkalimetal atom is larger. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They derive their name from the alkalimetal group of elements to which the sodium belongs and that can induce basicity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is soluble in water and slightly soluble in ethanol, and is the weakest base among the alkalimetal hydroxides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This low solubility played an important role in the characterization of francium as an alkalimetal, as francium perchlorate coprecipitates with caesium perchlorate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alternatively, they can be prepared by dissolving selenium and an alkalimetal in a liquid ammonia. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For alkalimetal cyanide methods and methods employing acetone cyanohydrin, alcoholic solvents are commonly used. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Product hydrolysis should be expected in reactions of alkalimetal cyanides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The new order was in agreement with the chemical properties of these elements, since argon is a noble gas and potassium is an alkalimetal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Generally sodium is used as the alkalimetal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Furthermore, unlike most other alkalimetal peroxides, it is not hygroscopic. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He observed that mixtures of alkalimetal oxides and carbon react at high temperatures with nitrogen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkaline earth metals were precipitated either as sulfates or oxalates, leaving the alkalimetal in the solution. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is often stored in the form of alkalimetal salts. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Nitrogen is used as a quenching gas, which prevents the fluorescence of the polarized alkalimetal, which would lead to de-polarization of the noble gas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Glass coatings are used for liquid alkali metals (except lye, which will eat through glass) and alkalimetal solutions in ammonia. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because of this, anhydrous salts containing alkalimetal cations are often used as desiccants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It also coprecipitates with silicotungstic acid, and with perchloric acid, without another alkalimetal as a carrier, which provides other methods of separation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, interfering signals are observed due to side reactions of the matrix with alkalimetal ions which can impair the analysis of the spectra. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In the solid alkalimetal salts, the croconate anions and the alkali cations form parallel columns. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It reacts pseudoephedrine with liquid anhydrous ammonia and an alkalimetal such as sodium or lithium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Rubidium is a soft, silvery-white metallic element of the alkalimetal group, with an atomic mass of 85.4678. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This type of collision can be a significant spin relaxation mechanism for polarized alkalimetal vapor. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Initiation can also involve the transfer of an electron from the alkalimetal to the monomer to form an anion-radical. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This transfer is usually only energetically favorable if the aprotic solvent efficiently solvates the alkalimetal ion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Some polymer electrolytes form complexes with alkalimetal salts, which produce ionic conductors that serve as solid electrolytes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkalimetal ions may migrate through plastic packaging and influence the functioning of semiconductors. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Germanium impurities tend to trap electrons created during irradiation; the alkalimetal cations then migrate towards the negatively charged center and form a stabilizing complex. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thus, spin-exchange collisions between alkalimetal atoms can change the hyperfine state of the atoms while preserving total angular momentum of the colliding pair. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Chromium nitrate is used in the production of alkalimetal-free catalysts and in pickling. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkalimetal salts are common colourless solids that are highly soluble in water. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This reaction is conducted at elevated temperature in an inert solvent using a dispersion of the alkalimetal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The salt forms several crystalline hydrates, unlike the other alkalimetal bromides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Francium is an alkalimetal whose chemical properties mostly resemble those of caesium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They announced their discovery of element 87 and proposed the name "alkalinium", as it would be the heaviest alkalimetal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This reaction is facilitated by the fact that the leaving group is most likely an arylcopper compound rather than the much more basic alkalimetal salt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Excitation of the alkalimetal results in ejection of electrons, which in turn are detected as a current flow between an anode and cathode in the chamber. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The difference between a basic salt and an alkali is that an alkali is the soluble hydroxide compound of an alkalimetal or an alkaline earth metal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alkalimetal ions are small and mobile; their presence in glass allows a degree of electrical conductivity, especially in molten state or at high temperature. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These compounds are over 200 times more electrically conductive than pure graphite, suggesting that the valence electron of the alkalimetal is transferred to the graphite layers (e.g.). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is an alkalimetal, the most reactive group in the periodic table, having properties and similarities with both other alkali metals and other period 5 elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The valence electron, s, of the excited rare gas has a bond energy close to that of the alkalimetal that follows it in the periodic table. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Note that only hydroxides with an alkalimetal column 1 are very soluble in water; hydroxides with an alkaline earth metal column 2 are not as soluble. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Obtained gas-phase dehalogenation with alkalimetal atoms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, alkynylalanes are useful for the coupling of tertiary halides and alkynes (a reaction difficult to effect with alkalimetal alkynes) and for conjugate addition and epoxide opening reactions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Measurement of densities and estimation of critical properties of the alkali metals. Compression of alkali metals by strong shock waves. The improved model provides critical temperature of alkali metals in agreement with other experiments, but is unable to predict accurate values for the critical volume and pressure. We turn to confront this semi-empirical prediction (5) for strongly coupled plasmas with data from experiment and from microscopic theory on the heavier liquid alkali metals at constant density. Elements try to reach the low-energy noble gas configuration, and therefore alkali metals and halogens will donate and accept one electron respectively. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Boron nitride reacts with nitrides of alkali metals and lanthanides to form nitridoborate compounds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are also compounds in which alkali metals and transition metals such as the fourth period transition metals except for copper and zinc. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Owing to these contrasting bond strengths, these materials engage in intercalation by alkali metals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The starting metal halides must be strictly anhydrous and alkali metals can be very hazardous. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Typical alkali metals used in this method are potassium, sodium, and lithium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Only mercury, gallium, and most of the alkali metals have lower melting points. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Significant differences between alkali metals and excited rare gases exist in their molecular symmetry. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkali metals react violently with water or even moist air to generate hydrogen, which can then be ignited by the heat of the reaction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This has been performed with alkali metals, electrochemically and with bases. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A similar effect occurs in caesium metal, the heaviest of the alkali metals which can be collected in quantities sufficient to allow viewing. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The higher alkali metals also favor the sterically congested conformation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Whereas isomerization is fast with lithium and sodium, it is slow with the higher alkali metals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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