| 单词 | Pb |
| 例句 | The decay series for 238 U ends with 206 Pb , so that the ratio of these nuclides in a rock is an indication of how long it has been since the rock solidified. College Physics for AP Courses 2015-08-12T00:00:00Z Metals that crystallize in an HCP structure include Cd, Co, Li, Mg, Na, and Zn, and metals that crystallize in a CCP structure include Ag, Al, Ca, Cu, Ni, Pb, and Pt. Chemistry 2019-02-14T00:00:00Z The chemical symbol for elemental lead is Pb. Environmental Biology 2018-09-06T00:00:00Z He noted however that most of the samples of polonium measured in the report were accompanied by activities from Pb-210. Arafat 'may have been poisoned' 2013-11-06T22:31:19Z Ilium; Is, ischium; Pb, pubis; d.l, dorso-lumbar vertebrae; Cd, caudal vertebrae; Am, acetabulum. Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 "Bible" to "Bisectrix" 2010-12-20T17:12:05.780Z Pt 36 30 Zn 23 21 Al 39 27 Cd 25 21 Pb .. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Mg, In, Cs, Pb, and Co would form cations because they are metals. Chemistry 2019-02-14T00:00:00Z C, Si, Ge, Zr, Th, tetravalent; Ti, tetravalent and hexavalent; Sn, Pb, divalent and tetravalent; Ce, trivalent and tetravalent. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Lead is not a compound, but an element whose chemical symbol is Pb, taken from the Latin name for lead. The Automobile Storage Battery Its Care And Repair It is obtained as a by-product in the metallurgy of lead: PbS + Fe = FeS + Pb. An Elementary Study of Chemistry Lead, Pb.—Granulated lead or lead-foil is used in the dry assay for silver and gold, and in the preparation of lead salts. A Text-book of Assaying: For the Use of Those Connected with Mines. In practice, a voltmeter would report a potential of −0.47 V with its red and black inputs connected to the Pb and Cu electrodes, respectively. Chemistry 2019-02-14T00:00:00Z If < 1 then in the limit of W the indexation can be rather simple, especially if Pb qr / W goes to zero too. Definition & Reality in the General Theory of Political Economy Colors the flame blue beyond the assay, owing to the presence of Pb. 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 process of ``forming'' thus briefly described was not continued indefinitely, but only till a fair proportion of the thickness of the plates was converted into the spongy material, PbO2 and Pb respectively. The Project Gutenberg Encyclopedia Volume 1 of 28 Then put in a clean strip of Pb, and set aside as before, examining the deposit finally. An Introduction to Chemical Science Which of the following atoms would be expected to form negative ions in binary ionic compounds and which would be expected to form positive ions: P, I, Mg, Cl, In, Cs, O, Pb, Co? Chemistry 2019-02-14T00:00:00Z Price indices for the average and subsistence workers are P and Pb. Definition & Reality in the General Theory of Political Economy Affords the characteristic Pb incrustation, and sometimes yields minute particles of Cu. 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 Ilium; a. anterior end; b. posterior end; Ia. ischium; Pb., pubis; T, tibia; F, fibula; As., astragalus; Ca., calcaneum; I, distal portion of the tarsus; i., ii., iii., iv., metatarsal bones. Lectures on Evolution Experiment 37.—Perform this experiment in the same manner as the two previous ones, dissolving a small piece of Pb, and using a strip of Zn to precipitate the Pb. An Introduction to Chemical Science In a sample of rock that does not contain appreciable amounts of Pb-208, the most abundant isotope of lead, we can assume that lead was not present when the rock was formed. Chemistry 2019-02-14T00:00:00Z Real positions thus are W / P and B / Pb. Definition & Reality in the General Theory of Political Economy An alloy of Sb and Pb is employed for type-metal as it expands at the instant of solidification. An Introduction to Chemical Science Pewter is composed of Sn and Pb; brass, of Cu and Zn; German silver, of brass and Ni; bronze, of Cu, Sn, and Zn; aluminium bronze, of Cu and Al. An Introduction to Chemical Science Cu is positive to Ag, but negative to Pb and Zn. An Introduction to Chemical Science Because when one mole of U-238 decays, it produces one mole of Pb-206, the amount of U-238 that has undergone radioactive decay since the rock was formed is: Chemistry 2019-02-14T00:00:00Z Wood's metal, composed of Pb eight parts, Bi fifteen, Sn four, Cd three, melts at just above 60 degrees, or far below the boiling-point of water. An Introduction to Chemical Science Note especially the colors of the oxides, the cubical crystallization and cleavage of galena, the specific gravity of the compounds, the softness of Pb, and the tarnish, Pb2O, which covers it,if long exposed. An Introduction to Chemical Science Distribution of Pb.—Pb is widely distributed, occurring as PbS and PbCO3. An Introduction to Chemical Science Which of the four elements are positive to Pb, and which negative? An Introduction to Chemical Science By heating it in air, SO2 is formed, and Pb liberated and drawn off. An Introduction to Chemical Science Pb is but little acted on by cold H2SO4, unless concentrated. An Introduction to Chemical Science To show that a little Pb has been dissolved, as PbSO4, in the manufacture of that acid, perform this experiment. An Introduction to Chemical Science Some portion of this is liable to dissolve in water, and, as all soluble salts of Pb are poisonous, water that has stood in pipes should not be used fordrinking. An Introduction to Chemical Science Pb gives to glass high refracting power, which is a valuable property of diamonds, as well as of lenses. An Introduction to Chemical Science Sn, Pb, and Zn are somewhat soluble in vegetable acids. An Introduction to Chemical Science Experiment 125.—Put a small fragment of Pb on a piece of charcoal, and blow the oxidizing flame against it for some time with a mouth blow-pipe. An Introduction to Chemical Science Tin foil is generally an alloy of Pb and Sn. An Introduction to Chemical Science As they slowly cool, Pb crystallizes, and is removed by asieve, while Ag is left in the liquid mass. An Introduction to Chemical Science Solder may have two parts of Sn to one of Pb, two of Pb to one of Sn, or equal parts of each, or the two elements may alloy in other proportions. An Introduction to Chemical Science When, by repeating the process, most of the Pb is eliminated, the rest is oxidized by heating in the air. An Introduction to Chemical Science |
| 随便看 |
|
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。