The Principles of Chemistry, Vol. 2 of 2 (Classic Reprint) - Couverture souple

Mendeléeff, Dmitry Ivanovich

Couverture souple

ISBN 10 : 1333530692 ISBN 13 : 9781333530693

Editeur : Forgotten Books, 2018

Synopsis

The digital edition of all books may be viewed on our website before purchase. Excerpt from The Principles of Chemistry



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A propos du livre

Présentation de l'éditeur

It is seen from the examples given in the preceding chapters that the sum of the data concerning the chemical transformations proper to the elements (for instance, with respect to the formation of acids, salts, and other compounds having definite properties) is insufiicient for accurately determining the relationship of the elements, inasmuch as this may be many-sided. Thus, lithium and barium are in some respects analogous to sodium and potassium, and in others to magnesium and calcium. It is evident, therefore, that for a complete judgment it is necessary to have, not only qualitative, but also quantitative, exact and measurable, data. When a property can be measured it ceases to be vague, and becomes quantitative instead of merely qualitative. A mong these measurable properties of the elements, or of their corresponding compounds, are :(a) isomorphism, or the analogy of crystalline forms ;and, connected with it, the power to form crystalline mixtures which are isomorphous ;(b) the relation of the volumes of analogous compounds of the elements ;(o) the composition of their saline compounds ;and (d) the relation of the atomic weights of the elements. In this chapter we shall briefly consider these four aspects of the matter, which are exceedingly important for a natural and fruitful grouping of the elements, facilitating, not only a general acquaintance with them, but also their detailed study. Historically the first, and an important and convincing, method for finding a relationship between the compounds of two different elements is by isomorphism. This conception was introduced into chemistry by Mitscherlich (in 1820), who demonstrated that the corresponding salts of arsenic acid, H3ASO4, and phosphoric acid, HgP04, crystallise VOL. II.
(Typographical errors above are due to OCR software and don't occur in the book.)

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Détails de l'édition

• Éditeur: Forgotten Books
• Date d'édition: 2018
• Langue: anglais
• ISBN 10: 1333530692
• ISBN 13: 9781333530693
• Reliure: Broché
• Nombre de pages: 564
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