a text-book of elementary chemistry (Google eBook)

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Page 163 - 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.
Page 126 - And when the two gases are mixed together in the ratio of two volumes of hydrogen to one of oxygen, they may be caused to unite by a flame, by an electric spark, or by finely divided platinum.
Page 57 - , • , N HHH N HHH Four di-atomic give two tetr-atomic molecules. Hence, one volume of nitrogen and three volumes of hydrogen form two volumes of ammonia gas. FOURTH CASE. — Lastly, one tetrad atom unites with four monad atoms, one tetrad molecule with four monad molecules, one volume of any tetrad with four volumes of any monad. The resulting molecule contains five atoms, and hence, the five original volumes are condensed to two. Substances of the fourth class, ie, tetrads, unite with monads...
Page 30 - Molecules. Compound Radicals. — Beside the atomic groups now considered, called saturated molecules because the bonds of all the atoms they contain are mutually engaged, it is often convenient to distinguish certain unsaturated groups of atoms, which, possessing free bonds, may enter into combination like single atoms. These unsaturated groups of atoms are called compound radicals. They cannot exist in a free state in nature, though, like an atom, by dombining with another similar group, they may...
Page 146 - It is somewhat heavier than air, its specific gravity being ri77. -Cooled to— 74°, or submitted to a pressure of 17 atmospheres at 10°, it condenses to a colorless mobile liquid of specific gravity 0-9, which freezes to a mass like ice at — 85°. It is quite soluble in water, i volume of which dissolves 3 volumes at ordinary temperatures, and -4-37 volumes at 0°.
Page 44 - If, on the other hand, excess of phosphoric acid be added to a solution of the common phosphate, evaporation yields crystals of sodium superphosphate, or "dihydrogen sodium phosphate," H:NaPO4 + H3O. An orthophosphate is known as "primary...
Page 16 - Negative End — . Oxygen. Sulphur. Nitrogen. Fluorine. Chlorine. Bromine. Iodine. Selenium. Phosphorus. Arsenic. Chromium. Vanadium. Molybdenum. Tungsten. Boron. Carbon. Antimony. Tellurium. Tantalum. Columbium. Titanium.
Page 140 - Distillation of Sulphur. enters a large brick chamber, and is there condensed. At first, when the walls are cold, a fine powder is produced, known in commerce as flowers of sulphur ; but afterwards, when the walls of the chamber become hot, the sulphur condenses to a liquid, which collects on the floor and may be drawn A off and ladled into moulds, forming what is ordinarily called roll brimstone.
Page 238 - ... olive, and turpentine, the animal oils called sperm and lard, and the mineral oils derived from petroleum, may be mentioned. Of solids from the vegetable kingdom, wood and bayberry wax ; from the animal, tallow and its product, stearin ; and from the mineral, paraffin and the various sorts of coal, are examples.
Page 134 - The dilute substance (or such as is used in medicine), however, is comparatively stable and may be boiled and even distilled without suffering decomposition. Its most remarkable property is the facility with which it evolves oxygen under certain conditions. Metallic silver, gold and platinum when finely divided, decompose it almost with explosion.

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