Conversations on Chemistry...: To which are Added, Some Late Discoveries On...fixed Alkalies

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From Sidney's Press; For Increase Cooke, Book-sellers, New Haven, 1814 - 375 oldal
 

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339. oldal - A small piece of pure potash, which had been exposed for a few seconds to the atmosphere, so as to give conducting power to the surface, was placed upon an insulated disc of platina, connected with the negative side of the battery of the power of...
339. oldal - Under these circumstances a vivid action was soon observed to take place. The potash began to fuse at both its points of electrization. There was a violent effervescence at the upper surface; at the lower, or negative surface, there was no liberation of elastic fluid ; but small globules having a high metallic lustre, and being precisely similar in visible characters to quicksilver, appeared, some of which burnt with explosion and bright flame, as soon as they were formed, and others remained, and...
viii. oldal - IN venturing to offer to the public, and more particularly to the female sex, an Introduction to Chemistry, the author, herself a woman, conceives that some explanation may be required ; and she feels it the more necessary to apologize for the present undertaking, as her knowledge of the subject is but recent, and as she can have no real claims to the title of chemist.
373. oldal - ... form, by the solvent powers of water. " The different qualities of leather made with the same kind of skin, seem to depend very much upon the different quantities of extractive matter it contains. The leather obtained by means of...
338. oldal - When the order was changed, so that the platina spoon was made negative, a vivid, constant light ' appeared at the opposite point. There was no effect of inflammation round it, but aeriform globules, which inflamed in the atmosphere, rose through the potash.
341. oldal - ... was produced, and evolved or carried into combination at the positive surface, it was reasonable to conclude that this substance was generated in a similar manner by the electrical action upon the alkalies; and a number of experiments made above mercury, with the apparatus for excluding external air, proved that this was the case.
340. oldal - ... basis of potash. I found that the platina was in no way connected with the result, except as the medium for exhibiting the electrical powers of decomposition ; and a substance of the same kind was produced when pieces of copper, silver, gold, plumbago, or even charcoal were employed for completing the circuit. The phenomenon was independent of the presence of air ; I found that it took place when the alkali was in the vacuum of an exhausted receiver.
348. oldal - ... plate of platina, fumes exhale from it, and it does not burn till it attains the temperature of the rapid combustion of the basis of potash. When the basis of potash is brought in contact with sulphur in fusion, in tubes filled with the vapour of naphtha, they combine rapidly with the evolution of heat and light, and a grey substance, in appearance like artificial sulphuret of iron, is formed, which if kept in fusion, rapidly dissolves the glass, and becomes bright brown. When this experiment...
53. oldal - Because the conversion of the ice into water being completed, the caloric no longer becomes latent ; and therefore the heat which the water now receives raises its temperature, as you find the thermometer indicates. Emily. But I do not think that the thermometer rises so quickly in the water, as it did in the ice, previous to its beginning to melt, though the lamp burns equally well ? Mrs.
347. oldal - So strong is the attraction of the basis of potash for oxygene, and so great the energy of its action upon water, that it discovers and decomposes the small quantities of water contained in alcohol and ether, even when they are carefully purified.

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