Journal of the Chemical Society, Volume 55Chemical Society., 1889 "Titles of chemical papers in British and foreign journals" included in Quarterly journal, v. 1-12. |
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Page vi
... Volume of Similar Compounds of Elements in relation to the Position of those Elements in the Periodic Table . Part I. SYDNEY YOUNG , D.Sc. , Professor of Chemistry , University College , Bristol · By XLIX . The Molecular Weights of the ...
... Volume of Similar Compounds of Elements in relation to the Position of those Elements in the Periodic Table . Part I. SYDNEY YOUNG , D.Sc. , Professor of Chemistry , University College , Bristol · By XLIX . The Molecular Weights of the ...
Page 12
... been precipitated , the mixture is allowed to stand on the water - bath for two or three hours , filtered , and evaporated to about one quarter of its original volume . After standing several 12 MASON : ACTION OF ETHYLENEDIAMINE.
... been precipitated , the mixture is allowed to stand on the water - bath for two or three hours , filtered , and evaporated to about one quarter of its original volume . After standing several 12 MASON : ACTION OF ETHYLENEDIAMINE.
Page 13
Chemical Society (Great Britain). one quarter of its original volume . After standing several hours in a cold place , the solution begins to deposit the new acid in the form of large , colourless , quadratic plates , having the constant ...
Chemical Society (Great Britain). one quarter of its original volume . After standing several hours in a cold place , the solution begins to deposit the new acid in the form of large , colourless , quadratic plates , having the constant ...
Page 22
... volume as 6 · 65 , and the heat of volatilisation of 18 grams of water at 100 ° as 9650 cal . , we get [ 9650 + 82 ( 18.1 6 · 65 ) = ] 10,589 cal . , as the heat of volatilisation at 18 ° , of which 580 cal . are absorbed in producing ...
... volume as 6 · 65 , and the heat of volatilisation of 18 grams of water at 100 ° as 9650 cal . , we get [ 9650 + 82 ( 18.1 6 · 65 ) = ] 10,589 cal . , as the heat of volatilisation at 18 ° , of which 580 cal . are absorbed in producing ...
Page 25
... volume of the liquid , and Thomsen's results with acid sulphates ( Thermochem . , 3 , Plate VI ) tend to support this view . * On such a view , dilution could never start , but only increase disso- ciation , and we have no grounds for ...
... volume of the liquid , and Thomsen's results with acid sulphates ( Thermochem . , 3 , Plate VI ) tend to support this view . * On such a view , dilution could never start , but only increase disso- ciation , and we have no grounds for ...
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Common terms and phrases
acetic acid action alcoholic solution alkaline ammonia ammonium analysis anhydride aqueous solution atomic weight benzene berberine boiling point bromine c.c. moist Calculated carbon cent Chem chemical chlorate chloric acid chloride cold colour colourless composition compound containing cooling copper crystallisation crystals decomposed decomposition dehydrothiotoluidine density determinations gave dextrin diazotised didymium dilute dissociation dissolved distilled dried elements ether ethyl evaporated experiments formed formula fractionation gives gram gram gave gram H₂O gram substance gave heated hydrochloric acid hydrogen hydrogen fluoride insoluble iodide liquid magnetic rotations gave melting point mercury metal method mixed mixture molecular weight molecule needles nitrate nitric acid nitrogen numbers obtained oxide oxygen periodic law peroxide phosphorus platinum potash potassium precipitate prepared pressure pure reaction residue salt samarium separated silver small quantity sodium soluble spectrum sulphate sulphuric acid tellurium temperature thiophosphoryl fluoride tion Trans tube vapour volume washed yellow yttria zinc
Popular passages
Page 631 - Ba = 68-5 the consecutiveness of change in atomic weight, which with the true values is so evident, completely disappears. Secondly, it had become evident during the period 1860-70, and even during the preceding decade, that the relations between the atomic weights of analogous elements were governed by some general and simple laws. Cooke, Cremers, Gladstone, Gmelin, Lenssen, Pettenkofer, and especially Dumas, had already established many facts bearing on that view. Thus...
Page 630 - The atomic weight of an element may sometimes be amended by a knowledge of those of the contiguous elements. Thus, the atomic weight of tellurium must lie between 123 and 126, and cannot be 128. 8. Certain characteristic properties of the elements can be foretold from their atomic weights. The aim of this communication will be fully attained if I succeed in drawing the attention of investigators to those relations which exist between the atomic weights of dissimilar elements, which, as far as I know,...
Page 629 - ... 4. The elements which are the most widely diffused have small atomic weights. " 5. The magnitude of the atomic weight determines the character of the element just as the magnitude of the molecule determines the character of a compound body.
Page 635 - The periods of the elements have thus a character very different from those which are so simply represented by geometers. They correspond to points, to numbers, to sudden changes of the masses, and not to a continuous evolution. In these sudden changes destitute of intermediate steps or positions, in the absence of elements intermediate between, say, silver and cadmium, or aluminium and silicon, we must recognise a problem to which no direct application of the analysis of the infinitely small can...
Page 643 - I will confine myself to simple substances and to oxides. Before the periodic law was formulated the atomic weights of the elements were purely empirical numbers, so that the magnitude of the equivalent, and the atomicity, or the value in substitution possessed by an atom, could only be tested by critically examining the methods of determination, but never directly by considering the numerical values themselves ; in short, we were compelled to move in the dark, to submit to the facts, instead of...
Page 630 - ... periodic law could not have been discovered, and which rendered its appearance natural and intelligible. In the first place, it was at that time that the numerical value of atomic weights became definitely known. Ten years earlier such knowledge did not exist, as may be gathered from the fact that in 1860 chemists from all parts of the world met at Karlsruhe in order to come to some agreement, if not with respect to views relating to atoms, at any rate as regards their definite representation....
Page 642 - When, in 1871, I described to the Russian Chemical Society the properties, clearly defined by the periodic law, which such elements ought to possess, I never hoped that I should live to mention their discovery to the Chemical Society of Great Britain as a confirmation of the exactitude and the generality of the periodic law.
Page 634 - atom," nevertheless history and custom have drawn a sharp distinction between the two words, and the present chemical conception of atoms is nearer to that defined by the Latin word than by the Greek, although this latter also has acquired a special meaning which was unknown to the classics. The periodic law has shown that our chemical individuals display a harmonic periodicity of properties dependent on their masses. Now natural science has long been accustomed to deal with periodicities observed...
Page 270 - Our notions of a chemical element have expanded. Hitherto the molecule has been regarded as an aggregate of two or more atoms, and no account has been taken of the architectural design on which these atoms have been joined. We may consider that the structure of a chemical element is more complicated than has hitherto been supposed. Between the molecules we are accustomed to deal with in chemical reactions and ultimate atoms...
Page 629 - Without entering into details, I will give the conclusions I then arrived at in the very words I used: — '1. The elements, if arranged according to their atomic weights, exhibit an evident periodicity of properties. '2. Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg platinum, iridium, osmium) or which increase regularly (eg potassium, rubidium, caesium). '3. The arrangement of the elements, or of groups of elements,...