Journal of the American Chemical Society, Volume 39, Part 1American Chemical Society, 1917 Issues for 1898-1901 include Review of American chemical research, v. 4-7; 1879-1937, the society's Proceedings. |
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acetone added alcohol alkali amalgam ammonia ammonium anhydride aqueous solution atomic barium barium hydroxide benzene boiling bromide Calc calculated calorimeter Chem chemical chloride colloid color compound concentration constant containing cooling crystalline crystals curve determined dilute dissolved distilled dried dysprosium equation equilibrium ester ether ethyl ethyl alcohol evaporated excess experimental experiments extract filtered flask flour formed formic fractions gave give glacial acetic acid glucose grams H₂O heated hydrochloric acid hydrogen hydrolysis hydroxide increase insoluble iodine laboratory liquid magnesium manganese dioxide melting point mercury method mixture molecules mutarotation nitric acid nitrogen iodide Nitron obtained oxide p-nitrobenzyl peroxide phenol phenolphthalein phosphorus platinum potassium potassium hydroxide precipitate prepared present pure pyridine quantity reaction reagent recrystallized residue salt sample saturated sodium sodium sulfite soln solu soluble solvent substance sulfate sulfuric acid Table temperature tion titration tube washed weight yellow yield
Popular passages
Page 650 - States as may be designated, and the Academy shall, whenever called upon by any department of the Government, investigate, examine, experiment, and report upon any subject of science or art, the actual expense of such investigations, examinations, experiments, and reports to be paid from appropriations which may be made for the purpose, but the Academy shall receive no compensation whatever for any services to the Government of the United States.
Page 460 - ... we suppose the structure of the surface of a liquid to be at first the same as that of the interior of the liquid, then the actual surface is always formed by the orientation of the least active portion of the molecule toward the vapor phase, AND AT ANY SURFACE OR INTERFACE THE CHANGE WHICH OCCURS IS SUCH AS TO MAKE THE TRANSITION TO THE ADJACENT PHASE LESS ABRUPT.
Page 670 - ... strongly; for, of the six most abundant elements, only aluminum is odd numbered, and the elements of even atomic number make up about 86% of the material. The only odd numbered elements other than hydrogen present in the lithosphere in amounts over 0.2% are aluminum, sodium, and potassium. Table 2 gives the average composition of iron and stone meteorites, arranged according to the periodic system. The numbers before the symbols represent the atomic numbers, and the numbers underneath give the...
Page 805 - ... forms of the sugar. The nonreducing, nonmutarotating sugars (for example, sucrose, trehalose, raffinose) do not show this maximum rate of solution. By measuring the maximum rate of solution, or the initial and final solubilities, of many of the mutarotating sugars, it has been possible to obtain experimental evidence on the rotatory powers of those forms of these sugars which have as yet not been crystallized and measured directly. In the following table a summary is recorded of the specific...
Page 121 - ... a grant from the Committee on Therapeutic Research, Council on Pharmacy and Chemistry, American Medical Association.
Page 419 - If the stray field of a molecule, that is of a complex of these atomic systems, be unsymmetrical, the surface layer of fluids and solids, which are close-packed states of matter, must differ from the interior mass in the orientation of the axes of the fields with respect to the normal to the surface, and so form a skin on the surface of a pure substance having all the molecules oriented in the same way instead of purely in random ways.
Page 687 - ... its orbit and it may then continue to describe an orbit about the positive nuclei of the two atoms. During that portion of the orbit within the second atom that atom would become, on the whole, negative while the first atom would be positive. During the other part of the orbit each atom would be electrically neutral, and the atoms might fall apart. When we remember, however, the tremendous velocity of the electrons and the relatively sluggish motions of the atoms it seems evident that the motion...
Page 670 - ... and calcium; and not only do all of these elements have even atomic numbers, but in addition they make up 98.6% of the material of the meteorites. Of the remaining elements present to a great enough extent to have an appreciable effect upon the percentage values, 7 are odd and 5 are even...
Page 654 - On February 28, 1917, the Council of National Defense passed a resolution expressing its recognition of the fact that the National Research Council, at the request of the President, had organized the scientific resources of the country in the interest of national defense and national welfare, and requesting the research council to cooperate with it in matters pertaining to scientific research for national defense. As...
Page 461 - The stability of emulsoid particles seems to be brought about by orientation of molecules at the interface with the medium of dispersion. The best emulsifying agents, for example, have very long molecules, with a polar or active group at one end of the molecule. For the emulsoid particle to be stable, the molecules which make the transition from the interior of the drop to the dispersion medium, or the molecules of the "film," should fit the curvature of the drop (Fig.