The Chemist: A Monthly Journal of Chemical and Physical Science..., 1. kötet1850 |
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1 - 5 találat összesen 100 találatból.
. oldal
... washed twice in cold alcohol , dissolved twice in boiling alcohol and crystallised , gives caffeïne in distinct , white , brilliant prisms . Pure caffeïne thus obtained for the first time directly , is fusible by heat and volatile ...
... washed twice in cold alcohol , dissolved twice in boiling alcohol and crystallised , gives caffeïne in distinct , white , brilliant prisms . Pure caffeïne thus obtained for the first time directly , is fusible by heat and volatile ...
. oldal
... washed with alcohol of 0.60 ; the solutions , added together , were of a rather syrupy consistence : three times their bulk of alcohol was added to them . The liquid separated into two parts : one was viscid , and deposited ; the other ...
... washed with alcohol of 0.60 ; the solutions , added together , were of a rather syrupy consistence : three times their bulk of alcohol was added to them . The liquid separated into two parts : one was viscid , and deposited ; the other ...
2. oldal
... washed with alcohol of 0.60 ; the solutions , added together , were of a rather syrupy consistence : three times their bulk of alcohol was added to them . The liquid separated into two parts : one was viscid , and deposited ; the other ...
... washed with alcohol of 0.60 ; the solutions , added together , were of a rather syrupy consistence : three times their bulk of alcohol was added to them . The liquid separated into two parts : one was viscid , and deposited ; the other ...
5. oldal
... washed , they did not appear to retain any thus , the aromatic matter was entirely soluble in water . The third receiver , cooled several degrees below the freezing point , condensed a few drops of water exhaling the mixed odor of ...
... washed , they did not appear to retain any thus , the aromatic matter was entirely soluble in water . The third receiver , cooled several degrees below the freezing point , condensed a few drops of water exhaling the mixed odor of ...
10. oldal
... washed in a river ; however , it retains its general form , which is that of a thick , flat , and irregular vein . The form of this piece and the presence of quartz show us that , in its primitive situa- tion , the gold forms veinules ...
... washed in a river ; however , it retains its general form , which is that of a thick , flat , and irregular vein . The form of this piece and the presence of quartz show us that , in its primitive situa- tion , the gold forms veinules ...
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acetate action albumen alcohol alkali alloy alumina ammonia analysis animal appears baryta battery bodies boiling carbonate of lime carbonic acid cent charcoal chemical chemists chloride chloride of sodium chloroform chromic acid color combination composition compound contained copper crystallised crystals decomposed decomposition dilute disengagement dissolved distilled dried effects eggs electricity employed ether evaporation experiments extract fatty matter filtered fused give glass gold grammes heat humus hydrochloric acid hydrogen insoluble iodine liquid liquor magnesia manufacture manure means ment metallic mineral mixed mixture nitrate nitric acid nitrogen obtained odor operation oxide oxide of iron oxygen phosphate phosphoric acid plant platinum portion potassa potassium precipitate prepared present produced proportion quinquina residue salt santonine silica silver small quantity soda soluble solution starch substances sugar sulphate sulphuret sulphuric acid surface tained temperature tion tube vegetable vessel washed whilst yellow zinc
Népszerű szakaszok
352. oldal - THE EXHIBITION of 1851 is to give us a true test and a living picture of the point of development at which the whole of mankind has arrived in this great task, and a new starting point from which all nations will be able to direct their further exertions.
352. oldal - So man is approaching a more complete fulfilment of that great and sacred mission which he has to perform in this world. His reason being created after the image of God, he has to use it to discover the laws by which the Almighty governs His creation, and, by making these laws his standard of action, to conquer nature to his use ; himself a divine instrument.
352. oldal - ... we are living at a period of most wonderful transition, which tends rapidly to the accomplishment of that great end to which, indeed, all history points — the realization of the unity of mankind. Not a unity which breaks down the limits, and levels the peculiar characteristics of the different nations of the earth, but rather a unity the result and product of those very national...
352. oldal - Not a unity which breaks down the limits, and levels the peculiar characteristics of the different nations of the earth, but rather a unity the result and product of those very national varieties and antagonistic qualities. The distances which separated the different nations and parts of the globe are...
87. oldal - OF CHEMISTRY ; Including the most Recent Discoveries and Applications of the Science to Medicine and Pharmacy, and to the Arts. By ROBERT KANE, MDMRIA, Professor of Natural Philosophy to the Royal Dublin Society.
200. oldal - It was further shown that chemical decompositions may be produced by liquid diffusion ; the constituents of a double salt of so much stability as common alum being separated, and the sulphate of potash diffusing in the largest proportion. In fact the diffusive force is one of great energy, and quite as capable of breaking up compounds as the unequal volatility of their constituents.
67. oldal - ... at a high temperature, and recasting several times to give a great many tints, varying from blue to pink, red, opaque yellow, and green. Charcoal in excess in a mixture of silica-alkaline glass gives a yellow colour, which is not so bright as the yellow from silver, — and this yellow colour may be turned to a dark red by a second fire. The author is disposed to refer these chromatic changes to some modifications of the composing particles rather than to any chemical changes in the materials...
418. oldal - It is now to be once more drawn off, and in a dry stoppered bottle mixed with a little powdered peroxide of manganese, with which it is gently agitated, and left in contact until the odour of sulphurous acid is entirely...
201. oldal - ... as 2 to 3. Hydrate of potash and sulphate of magnesia were less fully examined, but the first presented sensibly double the diffusibility of sulphate of potash, and four times the diffusibility of the sulphate of magnesia. If these times are all squared, the following remarkable ratios are obtained for the densities of the...
137. oldal - The magnetic needle was then forced back, by pins applied upon opposite sides of its two extremities, to its natural position when uninfluenced by a current ; after which, contact being broken at G or E, it was deflected strongly in the opposite direction ; thus showing, in accordance with the chemical effects...