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7/20/2012 5:07:00 AM [母婴指南]

oakley sunglasses sale oakley sunglasses sale . Occ

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oakley sunglasses sale 0. The oxide

7/20/2012 6:17:00 AM [旅游天下]

oakley sunglasses sale 0. The oxide

s of cobalt and nickel were scarcely acted upon at a dull red heat. The red oxide of iron was not affected at a strong red heat, whilst the black oxide was readily decomposed at a much lower temperature. Arsenical acid underwent no change at the greatest heat that could be given it in the glass retort, whilst the white oxide readily decomposed. In cases where oxygen was given off, it was found exactly the same in quantity as that which had been absorbed by the metal. Thus two grains of red oxide of mercury absorbed of a cubical inch of oxymuriatic gas, and afforded 0.oakley sunglasses sale oakley sunglasses sale of oxygen. Two grains of dark olive oxide from calomel decomposed by potash, absorbed about -/j— of oxymuriatic gas, and afforded -tw °^ oxygen, and corrosive sublimate was produced in both cases. In the decomposition of the white oxide of zinc, oxygen was expelled exactly equal to half the volume of the oxymuriatic acid absorbed. In the case of the decomposition of the black oxide of iron, and the white oxide of arsenic, the changes that occurred were of a very beautiful kind; no oxygen was given off in either case, but butter of arsenic and arsenical acid formed in one instance, and the ferruginous sublimate and red oxide of iron in the other. General Conclusions and ObservalionSt illustrated by Experiments. Oxymuriatic gas combines with inflammable bodies, to form simple binary compounds; and in these cases, when it acts upon oxides, it either produces the expulsion of their oxygen, or causes it to enter into new combinations. If idiscount oakley sunglasses t be said that the oxygen arises from the decomposition o oakley sunglasses outlet f the oxymuriatic gas, and not from oakley sunglasses sale the oxides, it may lie asked, why it is always the quantity contained in the oxide? and why in some cases, as those of the peroxides of potassium and sodium, it bears no relation to the quantity of gas? If there existed any acid matter in oxymuriat cheap oakley sunglasses ic gas combined with oxygen, it ought to be exhibited in the fluid compound of one proportion of phosphorus and two of oxymuriatic gas; for this, on such an assumption, should consist of muriatic acid (on the old hypothesis, free from water) and phosphorous acid; but this substance has no effect on litmus paper, and does not act under common circumstances on fixed alkaline bases, such as dry lime or magnesia. Oxymuriatic gas, like oxygen, must be combined in large quantity with peculiar inflammable matter, to form acid matter. In its union with hydrogen, it instantly reddens the driest litmus paper, though a gaseous body. Contrary to acids, it expels oxygen from protoxides, and com oakley sunglasses cheap bines with peroxides. When potassi http://www.oakleysunglassescheap-outlet.com um is burnt in oxymuriatic gas, a dry compound is obtained. If potassium combined with oxygen is employed, the whole of the oxygen is expelled, and the same compound formed. It is contrary to sound logic to say, that this exact quantity of oxygen is given off from a body not known to be compound, when we are certain of its existence in another; and all the cases are parallel. Scheele explained the bleaching powers of the oxymuriatic gas, by supposing that it destroyed colours by combining with phlogiston. Berthollet considered it as acting by supplying oxygen. He made an experiment, which seems to prove that the pure gas is incapable of altering vegetable colours, and that its operation in bleaching depends entirely upon its property of decomposing water, and liberating its oxygen. He filled a glass globe, containing dry powdered muriate of lime, with oxymuriatic gas. He introduced some dry paper tinged with litmus that had been just heated, into another globe containing dry muriate of lime: after some time this globe was exhausted, and then connected with the globe containing the oxymuriatic gas, and, by an appropriate set of stopcocks, the paper was exposed to the action of the gas. No change of colour took place, and after two days there was scarcely a perceptible alteration. Some similar paper dried, introduced into gas that had not been exposed to muriate of lime, was instantly rendered white. It is generally stated in chemical books, that oxymuriatic gas is capable of being condensed and crystallized at a low temperature.

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