A Short History of the Progress of Scientific Chemistry in Our Own Times

Paperback | January 31, 2012

bySir William Augustus Tilden

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899. Excerpt: ... CHAPTER V ORIGIN AND DEVELOPMENT OF THE IDEAS OF VALENCY AND THE LINKING OF ATOMS It has already been explained in Chapter III. that the discovery by Dumas of the fact that chlorine may be introduced into organic compounds in exchange for hydrogen, equivalent for equivalent, led to very important changes in the then current ideas of chemical combination. Up to that time the electro-chemical theory of Berzelius had been almost entirely predominant, and, naturally, the notion that an electro-negative element like chlorine could be exchanged for an electro-positive element such as hydrogen, without fundamentally altering the characters of the resulting compound, was completely at variance with the canons of that theory. But facts remain, while theories must be left either to be adapted to the new state of knowledge, or to be abandoned altogether. In this case the theory has been modified, but even to the present day the interchange of negative chlorine and positive hydrogen is a phenomenon which still affords room for speculation. One important consequence of the establishment of the facts of substitution was the inception of the idea of types, a theory which, as remarked by Williamson many years later, was "the vehicle of many an important discovery," and led to profound changes in the way of regarding chemical combination. A most instructive review of the whole position was given by Dumas himself in 1840.1 He then stated clearly that compounds which contain the. same number of equivalents united in the same manner, and which exhibit the same fundamental chemical properties, belong to the same chemical type. This view, though opposed by Berzelius, and at first by Liebig, was afterwards supported by the latter, who cited as analogous the case of chlorine and...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899. Excerpt: ... CHAPTER V ORIGIN AND DEVELOPMENT OF THE IDEAS OF VALENCY AND THE LINKING OF ATOMS It has already been explained in Chapter III...

Format:PaperbackDimensions:66 pages, 9.69 × 7.44 × 0.14 inPublished:January 31, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217428770

ISBN - 13:9780217428774

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