Sur la décomposition de quelques sulfates acides à la suite d'une déformation mécanique

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1904), XXIII

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 187-201; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 187-201; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments on anhydrous and hydrated sulfates of the alkali metals was conducted to study the decomposition of some acid sulfates as the result of mechanical deformation. The compression was effected in a steel cylinder, the bottom of which was perforated with a single small hole to permit liquid to flow away and provided with a loosely-fitting piston between which and the walls of the cylinder the salt could "flow". Results demonstrate that under compression involving mechanical deformation, compounds which may be regarded as resulting from the combination of a solid with a liquid tend to decompose into these generators. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur la densité de l'iodure cuivreux

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique. 2e série (1901), XX

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1901), 20, 79-80 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The sp.gr. of dry ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1901), 20, 79-80 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The sp.gr. of dry cuprousiodide is 5.653° at 15°, not 4.41° as stated by Schiff (Annalen, 1858, 108, 24); the molecular volume is thus 33.61, and is less than the sum of the atomic volumes of the elements (34.73), showing that, as usual, a contraction has occured in combination. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur la densité et l'état allotropique de certaines variétés de soufre : Remarque sur la détermination de la densité des corps en poudre fine

in Bulletin de la société chimique de Belgique (1907), XXI(7), 243-257

Sur la densité et l'état allotropique de certaines variétés de soufre : Remarque sur la détermination de la densité des corps en poudre fine

in Journal de Chimie Physique (1907), V

Spring, W. Journal de Chimie Physique et de Physico-Chimie Biologique (1907), 5, 410-26 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The ... [more ▼]

Spring, W. Journal de Chimie Physique et de Physico-Chimie Biologique (1907), 5, 410-26 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). The author prepared "milk of sulphur" by treating KnS with dil. HCl, and also by passing H2S into FeCl3 solution. The S from the K2Sn was completely sol. in CS2 and had a density of 2.0555, which is approximately the same as that of rhombic S. That from H2S was soluble CS2 to the extent of 96.8% only, and the density of the soluble portion was 2.0658, while that of the insoluble was 1.8686. The greater part of the sulphur from the K2Sn was therefore identical with that from H2S. This conclusion was confirmed by measuring their specific heats Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur la détermination des périodes d'étoiles varaibles

in Astronomy and Astrophysics (1980), 92

It is maintained that the periods announced for 11 Ori and 137 Tau by Winzer (1974) are not the true ones, but related periods. It is emphasized that in order to find the correct period of a star, it is ... [more ▼]

It is maintained that the periods announced for 11 Ori and 137 Tau by Winzer (1974) are not the true ones, but related periods. It is emphasized that in order to find the correct period of a star, it is necessary not only to use a good method of period determination (e.g., Renson 1978), but also to have a good series of measurements, especially concerning the time distribution of the measurements. Otherwise, the true period cannot be distinguished from the related ones. [less ▲]

Sur la diffusion de la lumière par les solutions

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique. Sciences. 3e série (1899), XXXVII(4), 300-315

Spring, W. Chemiker-Zeitung (1899), 23, 375-77; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed Jully 15, 2010). Following its studies over the color water(see p ... [more ▼]

Spring, W. Chemiker-Zeitung (1899), 23, 375-77; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed Jully 15, 2010). Following its studies over the color water(see p. 1011) reports authors over experiments concerning so-called shining of the liquids was examined particularly to solutions, D. hot liquids, those from molecules with different forces of attraction combined law. The used solutions disintegrate after their behavior into three groups: asymmetrical those of the alkali metal salts, education those of the ground compound/connection and heavy metal salts and C. those of the actual colloidal solutions only the solutions of the group of asymmetrical - were examined chlorides, bromides, chlorates and nitrates of sodium, potassium, ammonium, calcium and barium - can be represented without special difficulty optically empty(Tyndall), by distillation to one with usual water solution of these salts some drops of a colloidal iron, zinc or a cadmium oxide hydrate solution prepared add, the well jelly precipitation tear then all for portion cups with itself and leave an optically empty liquid. A similar clarifying of the solutions from the second group could not be accomplished because of the chemical reactions occurring thereby and the formation of basic salts. Author was content to compare a shining of the filtered solutions with that distilled water also filtered solutions the zinc, cadmium, manganese, cobalt, nickel old person behaved completely like distilled water, on the other hand solutions of aluminum, chrome, a, copper, mercury and lead salts made the electrical light bundle strongly visible. In by the dissociated effect water is formed for the latter trap on the salts a metal oxide hydrate, which, equal the colloids, which reflects light laterally. Addition decreased from HCl to the solutions(lead solution except for) corresponding shining, with the help of a strong light bundle one can recognize therefore the character of a solution. Clear one aqueous solutions of really colloidal substances such as gelatin, rubber arabicum, dextrine, alcoholic of colophony, sandarac, mastic, lacquer, furthermore stagnant Selfen solutions, diluted Solutions of alkali silicates, of different coloring materials as citizen of Berlin blue, Phenyl blue etc. show a constant strong light cone in each concentration. The past experiments could not decide the question, whether this light diffusion depends dissolved substances on the imperfect type of the solution or however on the molecular size, yet. From its observations author concludes that the clear can be separated solutions, which appear alike with usual lighting in intensive light into such asymmetrical, which behave as optically empty, and in education such, which reflects the light laterally. Only the first are chemically completely homogeneous, in them are an intimate mutual compound gel to assume with the solvent. That light-ether is closer in such a solution than everywhere in the empty area, but from same condensation. Those optically empty solutions are all also Electrolyte, the ions cause therefore no unequal condensation of light ether. In that it already cause the electrostatic forces before the light of a stream a regular distribution of the ions, so that these probably affect the refractive indexes, but the continuous light in its straight-line run cannot disturb. Although solutions that To group of education as electrolytes seem, steps the diffusion of the light only after suitable Diluted the solution up. Furthermore the salts of the metals concerned do not suffer an hydrolytic Dissociation, absolute homogeneity can any more exist, and consequently the hydrolysis is to be differentiated from the electrolytic Dissociation with respect to the light bundle. Finally come the solutions as really not electrolytic, i.e. as colloidal forwards, then they cause the diffusion of the light in each degrees of the Diluted u.7 can be never regarded as true transparent liquids. Substances with complicated molecules behave in an intensive light beam, similarly a molecular complex, therefore the majority of the organic bodies causes a light diffusion similarly colloidal solutions, but becomes shining organic liquids still more complicated by the occurrence of fluorescence features. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur la digestion des albuminoïdes chez quelques invertébrés

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1878), XLIV(8), 213

Sur la dilatation des aluns

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique. Sciences. 3e série (1882), III(4), 331-349

Sur la dilatation, la chaleur spécifique des alliages fusibles et leurs rapports avec la loi de la capacité des atomes des corps simples et composés pour la chaleur

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique. Sciences. 2e série (1875), XXXIX(5), 548-602

Sur la diminution de densité qu'éprouvent certains corps à la suite d'une forte compression et sur la raison probable de ce phénomène

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1903), (12), 1066-1082

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1904), 1903, 1066-82; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010 ... [more ▼]

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1904), 1903, 1066-82; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). At an amount of metals, as well as other materials, very strong pressure causes, (over 10000 atmospheres, instead of a density increase a decrease [with (NH4)2SO4 for example: 1.773 to 1.750). For these by the author, as well as feature examined more near by KAHLBAUM is tried an explanation, by being brought in compound/connection with the variation in volume with melting. It assumed that perfectly spherical bodies under the influence of an all-sided working strong pressure partly do not arrive at "flowing", thus a change of their molecular structure in the sense of a reduction that is experienced viscosity (pseudo fusion). If this view applies, then bodies, which expand when melting, must experience a volume increase with strong pressure also and in reverse. This consequence is confirmed by the experience. Examples of the first type are tin, lead, cadmium, silver, during bismuth when melting pull together and accordingly also with strong pressure at density increase. Author made wires of different metals, by being pressed by close openings, and observed the fact that Bi-wire was first completely flexible and returned only to some bends to the brittle condition whereby the acceptance by high pressure caused one flowing is supported. The obtained wires were divided ever into 2 parts, and heats one half up to near the melting point, whereby S.c. returned to the normal condition. If one dipped now the "started" and the "fluent" wire together into a salt solution of the same metal, then a weak current could be proven by means of a sensitive galvanometer. The voltage/tension amounts to the following: with tin 0.11, lead 0.12, cadmium 0.20, silver 0.98, bismuth 0.385 milivolts. With the four first, lower volume increase melting metals the "fluent" wire cathode was, with bismuth anode. Similar results were obtained with polished metal bars and rolled out volumes. Over the density variations of some metals with 16° the following table gives information. Metal, Density of the, Fluent, Rolled Metals, Started metals. Lead..., 11.3351, 11.3348, 11.3410. Tin..., 7.3011, 7.3016, 7.3137. Cadmium..., 8.6558, 8.6603, 8.6633. Silver..., 10.2485, 10.2531, 10.2696. Bismuth..., 9.8522, -, 9.8354. One must "protect" from this between firm, in which a metal cannot experience noticeable deformation, and which "apparent" firm differentiates, which by the loss of crystalline structure and the ability of flowing is characterized. Certain materials go possessing easily into this condition over (plastic metals), during different this ability in very small measure or at all; materials of the latter type (coal, sand) cannot be combined also through still so high pressure to a uniform mass. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]