A History of ChemistryMcGraw-Hill, 1918 - 292 páginas |
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Términos y frases comunes
acetic acid affinity alchemists alcohol alkali ammonia ammonium argon atmosphere atomic weights Avogadro's base Berthelot Berthollet Berzelius Boyle Bunsen carbon Chaux chemical chemical affinity chemists chlorine combination combustion conclusion contain crystal Dalton Davy decomposed decomposition determined discovery dualistic Dumas electricity electrolysis elements ether ethyl experimental experiments fact Faraday formula fundamental gases Gay-Lussac Gerhardt heat helium hydrogen hypothesis idea important interest investigation Kekulé laboratory latter Lavoisier Lavoisier's Liebig metal modern molecular molecules muriatic nature neutral nitric nitrogen number of atoms observed obtained organic chemistry organic compounds original Ostwald oxide oxygen Paracelsus particles phlogiston phlogiston theory phosphorus position potassium prepared Priestley properties proportions published quantity radical radioactive radium rays reactions relationships salts Scheele showed solution substances sulphate sulphuric acid theory Thorium tion type theory valence Van't Hoff vapor densities volume Wöhler X-rays zinc
Pasajes populares
Página 67 - All these things considered [that is, the chemical facts he had just recited], it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, movable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which He formed them; and that these primitive particles, being solids, are incomparably harder than any porous bodies compounded of them, even so very hard as never to wear or break...
Página 92 - A small piece of pure potash, which had been exposed for a few seconds to the atmosphere, so as to give conducting power to the surface, was placed upon an insulated disc of platina, connected with the negative side of the battery of the power of 250 of 6 and 4, in a state of intense activity ; and a platina wire, communicating with the positive side, was brought in contact with the upper surface of the alkali.
Página 67 - All these things being considered, it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, moveable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which he formed them...
Página 93 - Under these circumstances a vivid action was soon observed to take place. The potash began to fuse at both its points of electrization. There was a violent effervescence at...
Página 93 - ... small globules having a high metallic lustre, and being precisely similar in visible characters to quicksilver, appeared, some of which burnt with explosion and bright flame, as soon as they were formed, and others remained, and were merely tarnished, and finally covered by a white film which formed on their surfaces.
Página 167 - When the formulae of inorganic chemical compounds are considered, even a superficial observer is struck with the general symmetry of their construction; the compounds of nitrogen, phosphorus, antimony, and arsenic especially exhibit the tendency of these elements to form compounds containing 3 or 5...
Página 70 - Having been long accustomed to make meteorological observations, and to speculate upon the nature and constitution of the atmosphere, it often struck me with wonder how a compound atmosphere, or a mixture of two or more elastic fluids, should constitute apparently a homogeneous mass, or one in all mechanical relations agreeing with a simple atmosphere.
Página 99 - ... advised me not to give up the prospects I had before me, telling me that Science was a harsh mistress ; and, in a pecuniary point of view, but poorly rewarding those who devoted themselves to her service.
Página 42 - With this apparatus, after a variety of other experiments, an account of which will be found in its proper place, on the 1st of August, 1774, I endeavoured to extract air from mercurius calcinatus per se; and I presently found that, by means of this lens, air was expelled from it
Página 100 - ... that matter. Finally, through his good efforts I went to the Royal Institution early in March of 1813, as assistant in the Laboratory; and in October of the same year, went with him abroad as his assistant in experiments and in writing. I returned with him in April 1815, resumed my station in the Royal Institution, and have, as you know, ever since remained there.