A Manual of Chemistry on the Basis of Dr. Turner's Elements of Chemistry: Containing, in a Condensed Form, All the Most Important Facts and Principles of the Science : Designed for a Text Book in Colleges and Other Seminaries of Learning

Thomas, Cowperthwait, 1843 - 480 pagina's

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Pagina 289 - Speculum-metal, with which mirrors for telescopes are made, consists of about two parts of copper and one of tin. The whiteness of the alloy is improved by the addition of a little arsenic. Copper and zinc unite in several proportions, forming alloys of great importance in the arts. The best brass consists of four parts of copper to one of zinc; and when the latter is in a greater proportion, compounds are generated which are called tombac, Dutch-gold, and pinchbeck. The white copper of the Chinese...
Pagina 169 - Recently boiled water dissolves its own volume of carbonic acid at the common temperature and pressure ; but it will take up much more if the pressure be increased. The quantity of the gas absorbed is in exact ratio with the compressing force ; that is, water dissolves twice its volume when the pressure is doubled, and three times its volume, when the pressure is trebled. A saturated solution...
Pagina 289 - ... in order to protect its surface from rusting. For this purpose, pieces of tin are placed upon a well-polished sheet of copper, which, if the process is skilfully conducted, adhere uniformly to its surface. The oxidation of the tin — a circumstance which would entirely prevent the success of the operation — is avoided by employing fragments of resin, or muriate of ammonia, and regulating the temperature with great care.
Pagina 366 - ... and ammonia is always one of the products of the destructive distillation. They never exist in an insulated state in the plants which contain them ; but are apparently in every case combined with an acid, with which they form a salt more or less soluble in water. These alkalies are for the most part very insoluble in water, and of sparing solubility in "cold alcohol ; but they are all readily dissolved by that fluid at a boiling temperature, being deposited from the solution, commonly in the...
Pagina 172 - When the lamp is carried into an atmosphere charged with fire-damp, the flame begins to enlarge ; and the mixture, if highly explosive, takes fire as soon as it has passed through the gauze, and burns on its inner surface, while the light in the centre of the lamp is extinguished.
Pagina 185 - ... appears distinctly luminous in the dark, and is gradually consumed. On this account, phosphorus should always be kept under water. The disappearance of oxygen which accompanies these changes is shown by putting a stick of phosphorus in a jar full of air, inverted over water. The...
Pagina 436 - Those mineral springs are called saline which do not belong to either of the preceding divisions The salts which are most frequently contained in these waters, are the sulphates, muriates, and carbonates of lime, magnesia, and soda.
Pagina 270 - ... of the salts of cobalt, most of which are of a pink hue. When heated to redness in open vessels, it absorbs oxygen, and is converted into the peroxide. It may be prepared by decomposing the carbonate of cobalt by heat, in a vessel from which the atmospheric air is excluded. It is easily known by its giving a blue tint to borax when melted with it, and is employed in the arts, in the form of smalt, for communicating a similar color to glass, to earthen ware, and to porcelain.
Pagina 341 - October 1804) contained the first announcement of the fact that oxygen and hydrogen unite to form water in the proportion of one volume of the former to two volumes of the latter (see ATOMIC THEORY).
Pagina 429 - Eudiometer, and is inflamed by the electric spark, the aperture of the tube being closed by the thumb at the moment of detonation. The total diminution in volume, divided by three, indicates the quantity of oxygen originally contained in the mixture. This operation may be performed in a trough either of water or mercury. Instead of electricity, spongy platinum may be employed for causing the union of oxygen and hydrogen gases ; and, while its indications are very precise, it has the advantage of...

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