The elements of inorganic chemistry, revised and corrected by G. Jarmain

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Seite 56 - Hydrogen is not a supporter of combustion : if a lighted taper be .plunged into a jar of hydrogen, it is extinguished ; the hydrogen burns only at the top of the jar, where it comes in contact with the oxygen of the air. Hydrogen burns with a pale blue flame without much light, but intense heat. The temperature may be increased by mixing hydrogen and oxygen in the proportion of two volumes of the former to one of the latter, and burning it from a safety jet. This is called the oxyhydrogen blowpipe....
Seite 56 - If a jet of hydrogen is burned in a dry glass jar, the sides become covered with moisture, owing to the formation of water by the union of the hydrogen with the oxygen of the air. If a tube of glass, about one inch in diameter and two feet long, be slowly passed downwards over a burning jet of hydrogen, a musical note is produced. If a piece of spongy platinum be brought near a jet of hydrogen, it is at once kindled, and the platinum becomes red-hot.
Seite 46 - On preparing a filter, the piece of paper should be first examined, by looking through it against the light, to ascertain that it is free from holes. The simplest filter is made by folding the paper twice in opposite directions...
Seite 6 - DEFINITION. — The specific gravity, or density of a body, is the number which expresses the ratio which the weight of a cubic inch of the body bears to the weight of a cubic inch of distilled water, at the temperature of 60° Fahrenheit.
Seite 44 - ... chemical. The sugar in water is a case of mere mechanical solution ; no chemical change has taken place, and, by evaporation, the sugar can be obtained in its original condition. Salt dissolved in water is another illustration of the same kind. In chemical solutions the solid and liquid combine together, forming a new compound, from which the original solid and fluid cannot be obtained by evaporation or any mechanical operation. When chalk is dissolved in hydrochloric acid, or copper dissolved...
Seite 334 - SECOND STAGE OR ADVANCED COURSE. In addition to the foregoing subjects, pupils presenting themselves for the advanced examination will be assumed to have received instruction in the following :— The experimental methods by which the composition of the following bodies have been accurately determined : water, atmospheric air, hydrochloric acid, ammonia, the gaseous oxides of nitrogen, the oxides of carbon, sulphuretted hydrogen.
Seite 310 - In this latter condition it may be used as a sympathetic ink : characters written on paper with it are invisible, from their paleness of color, until the salt has been rendered anhydrous by exposure to heat, when the letters, appear blue. When the paper is laid aside, moisture is again absorbed by it, and the writing once more disappears.
Seite 291 - As this process, besides thus producing and continually re-producing what I believe to be a new compound, reduces, by fully 80 per cent., the principal item in the cost of the manufacture of chlorine, greatly increases the quantity of chlorine which can be practically obtained from a given quantity of hydrochloric acid, and, moreover, enables the manufacture of chlorine to be carried on without the production of any offensive residue, I have ventured to think that a very brief account of it might...
Seite 9 - ... (The italics are the author's.) To the uninitiated it might appear strange to argue about the relative sizes of infinitely small particles. Again : — " All molécula are of the same size ; for the law of Ampere, which most chemists now accept, states that ' all gases and vapours contain the same number of molecules within the same volume.
Seite 42 - ... may reach to within a quarter of an inch of the bottom of the phial, so as to dip below the surface of the liquid. Hold this little instrument before the fire, or plunge it into hot water, when the air that is in the phial will expand, and force up the coloured liquor into the tube.

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