Elements of chemistry: in which the recent discoveries in the science are included and its doctrines familiarly explained. Illustrated by numerous engravings and designed for the use of schools and academies

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Pratt, Woodford & co., 1847 - Chemistry - 422 pages
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Page 80 - The conception of a force acting directly as the quantity of matter, and inversely as the square of the distance...
Page 72 - This circumstance aris.es from the fact, that in forming water, these two gases combine in the proportion of two volumes of hydrogen to one of oxygen.
Page 203 - The crowd from all sides soon collected to the number of several hundreds, some crying out for a husband, others for a parent or a son, and all deeply affected with an admixture of horror, anxiety, and grief.
Page 297 - The oxygen, both of the oxide and the acid of which the salt is composed, unites with the carbon, forming carbonic acid, while the sulphur and metal combine to form the new compound, the sulphuret} The sulphates in solution, are readily detected by muriate of baryta ; the muriate being decomposed by the sulphuric acid, an insoluble sulphate of baryta is formed, which falls to the bottom of the vessel in the form of a white powder.
Page 240 - If much finer, i! does not retain sufficient heat at the lower part of the coil to keep up the evaporation of the alcohol from the wick. The coiling of the wire, and the adjustment of the wick, are the most difficult parts of the construction. The coil A. fig.
Page 376 - ... carbonate of ammonia is added; and the insoluble matters, consisting of silica, carbonate of baryta, and all the constituents of the mineral, excepting the fixed alkali, are collected on a filter. The clear solution is evaporated to dryness in a porcelain capsule, and the dry mass is heated to redness in a crucible of platinum, in order to expel the salts of ammonia. The residue is the chloride of potassium or sodium.
Page 66 - It has already been stated that from the connecting wires of the galvanic circle, or battery, there is a constant current of electricity passing from the zinc to the copper, and from the copper to the zinc plates. In the single circle these currents will be negative from the...
Page 152 - ... stratum, by further cooling, becomes specifically lighter ; and instead of sinking to the bottom as before, and displacing the warmer water, it now remains at the surface, becomes converted into a cake of ice, and preserves the subjacent water from the further influence of the cold. If, like mercury, it continued to increase in density to its freezing point, the cold air would continue to rob the mass of water of its heat, till the whole sunk to 32, when it would immediately set into a solid...
Page 376 - ... muriatic acid, and the manganese thrown down as usual by means of an alkali. But if the manganese be the chief ingredient, the best method is to precipitate it at once, together with the two earths, by a fixed alkaline carbonate at a boiling temperature. The precipitate, after being exposed to a low red heat and weighed, is put into cold water, acidulated with a drop or two of nitric acid, when the lime and magnesia will be slowly dissolved with effervescence. Should a trace of the manganese...
Page 372 - I shall, therefore, endeavour to give short directions for determining the quantity of each of these substances. In attempting to separate two or more fixed principles from each other, the first object of the analytical chemist is to bring them into a state of solution. If they are soluble in water, this fluid is preferred to every other menstruum ; but if not, an acid or any convenient solvent may be employed. In many instances, however, the substance to be analyzed resists the action even of the...

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