The Chemist: A Monthly Journal of Chemical Philosophy, 1. kötet1850 |
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1 - 5 találat összesen 100 találatból.
1. oldal
... evaporation , a crystalline deposit , which , 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 ...
... evaporation , a crystalline deposit , which , 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 ...
3. oldal
... evaporated in contact with powdered marble , gives sulphate of potassa mixed with an acid chloroginate of caffeïne ... evaporation . After twenty or thirty days the conversion is finished ; it is eva- porated to dryness , and a very ...
... evaporated in contact with powdered marble , gives sulphate of potassa mixed with an acid chloroginate of caffeïne ... evaporation . After twenty or thirty days the conversion is finished ; it is eva- porated to dryness , and a very ...
5. oldal
... evaporation of the ether , which waste may be determined by dissolving this essence a second time in ether , and weighing again after a second evaporation . This essential oil was formed of two parts ; one , less volatile and less fluid ...
... evaporation of the ether , which waste may be determined by dissolving this essence a second time in ether , and weighing again after a second evaporation . This essential oil was formed of two parts ; one , less volatile and less fluid ...
7. oldal
... evaporation , a black body is precipitated from it , which is analogous to fulminating silver . This sub- stance does not explode either by a blow or by heat . Chloride of silver dissolves in the solution of methylamine . Chloride of ...
... evaporation , a black body is precipitated from it , which is analogous to fulminating silver . This sub- stance does not explode either by a blow or by heat . Chloride of silver dissolves in the solution of methylamine . Chloride of ...
13. oldal
... evaporation of the solution . This simple method may be used in a great many circum- stances : it succeeds equally ... evaporating to dryness the solution , in which must be an excess of hydrated phosphate of silver , and treating the ...
... evaporation of the solution . This simple method may be used in a great many circum- stances : it succeeds equally ... evaporating to dryness the solution , in which must be an excess of hydrated phosphate of silver , and treating the ...
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Gyakori szavak és kifejezések
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 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 plants 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
356. oldal - ... view of this vast collection will produce upon the spectator will be that of deep thankfulness to the Almighty for the blessings which he has bestowed upon us already here below, and the second, the conviction that they can only be realized in proportion to the help which we are prepared to render to each other, therefore only by peace, love and ready assistance not only between individuals but between the Nations of the Earth.
356. oldal - The products of all quarters of the globe are placed at our disposal, and we have only to choose which is the best and the cheapest for our purposes, and the powers of production are entrusted to the stimulus of competition and capital.
77. oldal - ... put the mucky liquid to stand, so that they may, after it has rested for a day or two, skim the fluid from the solid particles of filth, pollution, and disease.
347. oldal - ... and liberates the oxygen in its gaseous state to sustain the healthy functions of the animal life, at the same time that it feeds on the rejected matter which has fulfilled its purposes in the nourishment of the fish and snail, and preserves the water constantly in a clean and healthy condition.
321. oldal - When one pound of lean beef, free of fat, and separated from the bones, in the finely chopped state in which it is used for beef sausages or mincemeat, is uniformly mixed with its own weight of cold water, slowly heated to boiling, and the...
356. 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.
356. 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...
356. oldal - Whilst formerly the greatest mental energies strove at universal knowledge, and that knowledge was confined to the few, now they are directed on specialities, and in these, again, even to the minutest points...
204. 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.
71. 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...