. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. Ca2H0{2cf Lines converging from the symbols of these elements also, and unit-ing at the formula of the substance (CaC03), are then drawn to sug-gest approach of the atoms of the elements and their union to forma molecule of the compound. The diagram will now be complete,and will have been built up in the students note-book thus: 2KHO K2C031 h Ca2HO (2HO|Ca. CaCO, The formation of a third product
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. Ca2H0{2cf Lines converging from the symbols of these elements also, and unit-ing at the formula of the substance (CaC03), are then drawn to sug-gest approach of the atoms of the elements and their union to forma molecule of the compound. The diagram will now be complete,and will have been built up in the students note-book thus: 2KHO K2C031 h Ca2HO (2HO|Ca. CaCO, The formation of a third product or a fourth product would beindicated in a similar manner. Note 1.—It will be seen that the chief data required in makingeither equationary or diagrammatic notes of decompositions are thesymbolic formulae of the various compounds employed and formulae are, in this Manual, given whenever obtain them in the first instance by help of quantitativeanalysis. By the latter means also is obtained a check on the prob-abilities respecting the relative number of molecules concerned in areaction. Note 2.—While an equation or a diagram is an attempt to picturethe reaction which ensues when molecules of different substances 66 THE METALLIC RADICALS. act upon one another, it necessarily only represents two or a min-imum number of the molecules. The student will of course under-stand that what is true of these two or three molecules is true ofthe thousands or millions of molecules forming the mass or wholequantity of materia
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