A Treatise on Chemistry, Volum 2


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Pàgina 318 - 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 the upper surface; at the lower, or negative surface, there was no liberation of elastic fluid ; but small globules having a high metallic lustre, and being precisely similar in visible characters to quicksilver, appeared, some of which burnt with...
Pàgina 55 - Without entering into details, I will give the conclusions I then arrived at in the very words I used: 1. The elements, if arranged according to their atomic weights, exhibit an evident periodicity of properties. 2. Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value ( eg platinum, iridium, osmium ) or which increase regularly ( eg potassium, rubidium, caesium). 3. The arrangement of the elements, or of groups of elements,...
Pàgina 97 - As he that taketh away a garment in cold weather, and as vinegar upon nitre, so is he that singeth songs to a heavy heart.
Pàgina 55 - ... would be between 65 and 75. 7. The atomic weight of an element may sometimes be amended by a knowledge of those of the contiguous elements.
Pàgina 613 - Compounds of barium with fixed acids, giving no reaction either when alone or after addition of hydrochloric acid, should be fused with carbonate of sodium as described under strontium, and the carbonate of barium thus obtained examined. If barium and strontium occur in small quantities together with large amounts of calcium, the carbonates obtained by fusion are .dissolved in nitric acid, and the dried salt extracted with alcohol : the residue contains only barium and strontium, both of which can...
Pàgina 55 - ... 4. The elements which are the most widely diffused have small atomic weights. 5. The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.
Pàgina 318 - ... 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.
Pàgina 626 - They showed* that a burning surface of magnesium wire, which, seen from a point at the sea's level, has an apparent magnitude equal to that of the sun, effects on that point the same chemical action as the sun would do if shining from a cloudless sky at a height of 9° 53
Pàgina 417 - DETRIMENTAL to the power of the battery : the copper plate is also covered with a coating of metallic copper, which is continually being deposited ; and so perfect is the sheet of copper thus formed, that, on being stripped off, it has the polish, and even a counterpart of every scratch of the plate on which it is deposited.
Pàgina 178 - ... which we see in the solar spectrum ; and this supposition is rendered still less probable by the fact that these lines do not appreciably alter when the sun approaches the horizon. It does not, on the other hand, seem at all unlikely, owing to the high temperature which we must suppose the sun's atmosphere to possess, that such vapors should be present in it.

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