Principles of Chemical Philosophy

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J. Allyn, 1885 - Chemistry - 623 pages
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Page 159 - Most of these combustibles contain more or less oxygen, and it is found that the amount of heat developed by the perfect combustion of the fuel is equal to that which would be produced by the perfect combustion of all the carbon, and of so much of the hydrogen as is in excess of that required to form water with the oxygen present. The rest of the hydrogen may be regarded, so far as relates to the present problem, as in combination with oxygen in the state of water ; and in estimating the available...
Page 1 - Therefore the specific gravity of a solid or a liquid body, is the ratio of its weight to the weight of an equal volume of water...
Page 222 - ... quantity we will represent by E. It appears, then, from the above analysis, that an electrical current is a continuous chain, which is sustained in a regulated and equable motion in all its parts by the chemical activity in the cell, and that the strength of this current at any point of the chain must be directly proportional to the electromotive force, and inversely proportional to the sum of the resistances throughout the circuit. If, then, we represent the resistance in the conducting wire...
Page 409 - KCrO,Cl to potaseic chromate on the one side, and chlorochromic anhydride on the other ? 20. Write the reaction by which OF, is obtained in the reaction described above. It may also be prepared by distilling a mixture of potassic dichromate, ammonic fluoride, and sulphuric acid. Write the reaction. 21. Chromic fluoride is decomposed by glass, and for this reason we have not been able to analyze it, or to determine the density of its vapor satisfactorily. Its constitution is inferred from the products...
Page vi - Part I. of the book contains a statement of the general laws and theories of chemistry, together with so much of the principles of molecular physics as are constantly applied to chemical investigations. It might be called a Grammar of the science.
Page 65 - LJ The first of these forms is adapted for calculating the per cent of each element of a compound when the molecular weight, the number of atoms of each element in one molecule, and the several atomic weights, are known ; and it is evident that all these data are given by the chemical symbol of the compound. The second of these forms enables us to calculate the number of atoms of each element present in one molecule of a compound when the percentage composition, the molecular weight, and the several...
Page 61 - As the weight of the molecule it to the weight of each element, so is one hundred parts to the percentage required. On the other hand, having given the percentage composition, it is easy to calculate the number of atoms of each element in the molecule of the substance. This problem is evidently the reverse of the last, but it does not, like that, always admit of a definite solution ; for, while there is but one percentage composition corresponding to a given symbol, there maybe an infinite number...
Page 30 - W", then the weight of the alcohol whose vapor filled the balloon at t' and H' was W' (apparent weight of globe and alcohol) + W" (weight of air displaced) — W (weight of glass). It only remains now to find by [14] the weight of an equal volume of air at the same temperature and pressure, taking into account, of course, the increased volume of the globe at the high temperature.
Page 28 - Ans. ^. 14. A closed glass vessel, which at 13 was filled with air having a tension of 76 cm, is heated to 585. Determine the tension of the heated air. Ans. 3 atmospheres. 15. Reduce the following volumes of gas, measured at the temperatures and pressure annexed, to 0 and 76 cm 1. 140 cTuT.8 H=57c. m. t = 136.5 Ans. 70 e7m".e 2. 320 cTm".8 // = 95 cm t= 91 Ans. 300 cTST.8 3. 480 cTuT.
Page 55 - When a gas can be formed, or any substance which is volatile at the temperature at which the experiment is made, this volatile substance is set free.

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