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[All that was assumed, argued about and comprehended by the chemists of the nineteenth century has become settled as secondary school curriculum by now. As we reach fifteen years of age all of us would know what the difference is between mixture and compound, what the meaning is of a chemical formula, or of atomic mass. People are familiar with these notions which have been household words for a long time. No one has ever met a person who had but the faintest doubt of their meaning or truth. Thus, it is understandable that their origin, the way in which this part of knowledge was accrued, went into oblivion. Usually we quote the laws of definite proportions and multiple proportions (that is, the weight proportions of the constituent atoms in a compound) as the bases of classical chemical thinking. These have rested on the simple, quantitative observations of chemists who dealt with material synthesis and analysis, who accepted the conservation of matter as a basic law and whose most important, sometimes only instrument was the balance.]
Published: Aug 18, 2022
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