By Truman Schwartz
Chemistry: mind's eye and Implication [Jun 01, 1973] Schwartz, Truman
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Extra resources for Chemistry: Imagination and Implication
2. A summary representation of the three mass laws of chemical combination. A and B are elements, and C and C are compounds. Law of Conservation of Mass x g A + ygB->(x + y)gC zgA + ygB-»(z + y)gC Law of Constant Composition For pure C For pure C x/y = k (a constant) z/y = k' (a constant) Law of Multiple Proportions x/z = m/n or k/k' = m/n (m and n are integers) Atomism: the evidence of things not seen 37 Quite clearly, it makes no difference which element is regarded as the constant mass reference.
Cuivre. Etain. Fer. Manganèiê. Mercure. Molybdèuel Nickel. Or. Platine. Plomb. Tungftène. Zinc. Terre calcaire, chaux. Magnifie , bafe du fel d'epfom. Barote, terre pefante. terre de l'alun, bafe de l'alun. Terre filieenfe, terre vitrifiable. 23 24 Chapter 2 Compounds, like elements, have, w h e n they are purified, sharply defined chemical and physical properties. The melting point, boiling point, density, and crystal structure are among the physical properties which together serve to uniquely characterize a compound or element.
O n the other hand, there are compounds w i t h identical properties but slightly different elementary mass proportions. A n d finally, there are some so-called nonstoichiometric compounds which show small variations in b o t h properties and composition. Happily, all these exceptions have been explained by the A t o m i c Theory and its extensions, but more of that later. MORE WAYS THAN ONE: MULTIPLE PROPORTIONS Water may be water, but water is not the only c o m p o u n d which is composed exclusively of hydrogen and oxygen.