Chemical Recreations: A Popular Compendium of Experimental Chemistry, for the Use of Beginners

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Richard Griffin, 1847 - 566 pages
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Page 134 - In all chemical investigations it has justly been considered an important object to ascertain the relative weights of the simples which constitute a compound. But unfortunately the inquiry has terminated here; whereas from the relative weights in the mass, the relative weights of the ultimate particles or atoms of the bodies might have been inferred, from which their number and weight in various other compounds would appear, in order to assist and to guide future investigations, and to correct their...
Page 133 - ... the thought. But if we limit the subject, by taking a given volume of any gas, we seem persuaded that, let the divisions be ever so minute, the number of particles must be finite; just as in a given space of the universe, the number of stars and planets cannot be infinite.
Page 133 - Chemical analysis and synthesis go no further than to the separation of particles one from another, and to their reunion. No new creation or destruction of matter is within the reach of chemical agency. We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen. All the changes we can produce consist in separating particles that are in a state of cohesion or combination, and joining those that...
Page 133 - Chemical Synthesis. When any body exists in the elastic state, its ultimate particles are separated from each other to a much greater distance than in any other state; each particle occupies the centre of a comparatively large sphere, and supports its dignity by keeping all the rest, which by their gravity, or otherwise are disposed to encroach up it, at a respectful distance.
Page 134 - Now it is one great object of this work, to show the importance and advantage of ascertaining the relative weights of the ultimate particles, both of simple and compound bodies, the number of simple elementary particles which constitute one compound particle, and the number of less compound particles which enter into the formation of one more compound particle.
Page 530 - In some part of the glass it will become glowing, almost white-hot, and will continue so, as long as a sufficient quantity of vapour and of air remain in the glass. When the experiment on the slow combustion of ether is made in the dark, a pale phosphorescent light is perceived above the wire, which is of course most distinct when the wire ceases to be ignited.
Page 269 - The immense mass of permanently elastic fluid which surrounds the globe we inhabit, must consist of a general assemblage of every kind of air which can be formed by the various bodies that compose its surface. Most of these, however, are absorbed by water ; a number of them are decomposed by combination with each other; and some of them are seldom disengaged in considerable quantities...
Page 89 - In order to produce these effects, the salts employed must be fresh crystallized, and newly reduced to a very fine powder. The vessels in which the freezing mixture is made should be very thin, and just large enough to hold it, and the materials should be mixed together as quickly as possible.
Page 60 - Red, by adding a Colourless one to it. To make the same Liquid alternately Red and Green by the addition of two Colourless Liquids. The methods of producing all these effects are detailed in Process h, on the Reactions of Acids and Alkalies with vegetable Colours, page 34. A Liquor which is Crimson at the bottom, Purple in the middle, and Green at the top. — Nearly fill a tall cylindrical glass with water, and colour it blue by adding a tablespoonful of tincture of cabbage — then make it green...
Page 373 - ... where they are permitted to remain near a slow fire for half an hour or more, in proportion .to the thickness of the charcoal : they are then taken out, and when perfectly cool, are fit for use. By adding a small quantity of rosin to the wax, they may be made considerably harder; and on the contrary, should they be required softer, a little butter or tallow will answer the purpose.

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