Practical Proofs of Chemical Laws
by Vaughan Cornish (9781458895615)

Practical Proofs of Chemical Laws
Vaughan Cornish
Release Date: 10 December 0140
Format: Paperback
Pages: 22
Category: Chemistry
Publisher: General Books
ISBN: 9781458895615
ISBN-10: 1458895610

Purchase of this book includes free trial access to where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III THE LAW OF DEFINITE PROPORTIONS Statement Of The Law.? When two elements combine to form a particular con.pound substance, they do so in a definite, fixed proportion by weight, which is independent of the manner in Mhich their combination is brought about. Tins is the first part of the law of definite and of constant proportions; for the second part, see Chapter V. The significance of this law lies in the persistence with which elements adhere to certain proportions of combination in spite of variation in the conditions under which combination occurs. The conditions of combination may vary in the following respects: ? 1. Relative masses of the reacting substances. 2. Pressure under which the reaction occurs. 3. Temperature at which the reaction occurs. 4. Chemical composition of the substances by the reaction of which the combination is brought about. The fact that the combining proportion does not depend upon the relative masses present may be verified by a comparison of the results obtained by different pupils in the last exercise. Thus, taking the two examples already quoted: ? Relative masses taken Combining proportion First pupil . Sulphur I: Silver 6732 Sulphur I Silver 6732 Second pupil . I: ? 3-333 ? I ? 6777 the difference between the combining proportions obtained by the two pupils is -66 per cent., the combining proportions being constant within -66 per cent. when the proportion between the substances taken was varied from 2 to 1. The second condition (variation in pressure) is tested to some extent by the same experiment, since the pressure in the tube depends, other things being equal, on the excess of sulphur present. The third and fourth variations of condition (viz. of temperature, and of the chemical comp...

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