Lessons in Chemistry

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J.B. Lippincott & Company, 1884 - 357 Seiten
 

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Seite 39 - Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain the same number of molecules...
Seite 6 - Fahrenheit degrees, multiply by 9, divide the product by 5, and add 32; to convert Fahrenheit degrees into Centigrade degrees, subtract 32, multiply by 5, and divide by 9.
Seite 41 - ... part in a chemical reaction. When a compound is formed, the atoms of two or more different elements unite to form a molecule, the smallest piece of a compound which can exist. A molecule of common salt, for example, contains one atom of sodium and one atom of chlorine; a molecule of water contains two atoms of hydrogen and one atom of oxygen; and a molecule of sugar contains twelve atoms of carbon, twenty-two of hydrogen, and eleven of oxygen. If, now, all the atoms of an element are identical...
Seite 238 - The yellowish precipitate is repeatedly dissolved in muriatic acid and precipitated with potash ; when sufficiently purified, it forms a precipitate consisting of microscopic four-sided prisms. This body is difficult of solution in cold water, but dissolves readily in hot water and in alcohol. On platinum foil it burns with a strongly sooty flame. The Compound of this Body with Muriatic Acid, C24H»(NH2) S2O4, HC1, forms reddish, four-sided prisms; it is readily soluble in water, and the solution...
Seite 93 - Water .—Water, as has been already stated, i:.s formed by the union of two volumes of hydrogen and one of oxygen, or by weight, of 8 parts of oxygen to 1 of hydrogen. The composition of water by measure and by weight, upon which, as a basis, the...
Seite 281 - Zinc has markedly different properties at different temperatures. At ordinary temperatures it is quite brittle; at 100-150° it can be rolled out in sheets, but above 200° it becomes brittle again. In dry air it does not change. When heated in the air it takes fire, and burns with a bluish flame, forming zinc oxide. This has been seen in the experiments with the oxyhydrogen blow-pipe.

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