Lessons in Elementary ChemistryMacmillan and Company, 1866 - 398 pages |
Table des matières
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Autres éditions - Tout afficher
Lessons in Elementary Chemistry: Inorganic an Organic Henry Enfield Roscoe Affichage du livre entier - 1868 |
Expressions et termes fréquents
action alcohol alkaline ammonia antimony aqueous arsenic atmosphere atoms of hydrogen barium bodies bromine burns C₂ calcium carbonic acid carbonic dioxide caustic potash chemical chlorate chloric acid chlorine coal colour colourless liquid Combining Weight combustion composition compounds contains cooled copper corresponding crystalline crystals decomposed decomposition Density dissolves distillation elements ether ethyl evaporation evolved flame fused gases glass glycol grms H₂ H₂O heated hence hydrate hydric hydrochloric acid hydrogen insoluble iodide iodine iron known lime melted mercury metals mixture molecules nitrate nitre nitric acid nitrogen nitrous obtained occurs oxalic oxalic acid oxide oxygen passing pentoxide phosphate phosphorus platinum possesses potassium potassium chlorate powder precipitate prepared pressure properties pure replaced salts silicates silver small quantities sodium solid soluble in water solution specific gravity substance sulphate sulphide sulphuric acid sulphuric dioxide Symbol temperature trioxide tube vapour volatile volume of oxygen whilst yields zinc
Fréquemment cités
Page 30 - Since two volumes of hydrogen unite with one volume of oxygen to form two volumes of water...
Page 235 - ... vapours should be present in it. Hence the observations of the solar spectrum appear to me to prove the presence of iron vapour in the solar atmosphere with as great a degree of certainty as we can attain in any question of natural science.
Page 294 - This body boils at 82°'5, and is insoluble in water, but soluble in alcohol and ether. It is...
Page 71 - ... bodies, and when cut possesses a brilliant lustre, and a high refractive power. In addition to its employment as a gem, the diamond is used for cutting and writing upon glass. We are altogether unacquainted with the mode in which the diamond has been formed; it cannot, however, have been produced at a high temperature, because when heated strongly in a medium incapable of acting chemically upon it, the diamond swells up, and is converted into a black mass resembling coke.
Page 48 - ... divisions on the tube to which the mercury reaches, whilst the height of the column of mercury in the tube above the trough, together with that of the barometer, and the temperature of the air, are also read off. A quantity of pure hydrogen gas is now added, more than sufficient to unite with...
Page 45 - Fig. 9, p. 29), and the average pressure at the sea-level is equal to that exerted by a column of mercury 760 mm. high. The air being elastic and having weight, it is clear that the lower layers of air must be more compressed than those above them, and hence the density of the air must vary at different heights above the sea-level.
Page 58 - ... therefore destroying, the colouring matter: this reaction, and the formation of red fumes in presence of metallic copper, &c. serve as modes of detecting the presence of nitric acid. One of the most delicate tests for this acid consists in adding to the liquid to be tested an equal volume of strong sulphuric acid, well cooling the mixture, and...
Page 38 - It will be seen that at first the upper thermometer always indicates a higher temperature than the lower one ; after a short time both thermometers mark 4°; and as the water cools still further, it will be seen that the thermometer at the top always indicates a lower temperature than that shown by the one at the bottom: hence we conclude that water above or below 4° is lighter than water at 4°. This cooling goes on till the temperature of the top layer of water sinks to o°, after which a crust...
Page 36 - C. it takes the liquid form, and above 100° it entirely assumes the gaseous form (under the ordinary atmospheric pressure of 760 mm.). The melting-point of ice is always found to be a constant temperature, and hence it is taken as the zero of the Centigrade scale ; water may, however, under certain conditions, be cooled below 0° C.