PAET II. CHEMISTEY 



CHAPTER VIII 

 OUTLINE OF CHEMICAL STUDY 



SECTION I 

 GENERAL INTRODUCTION 



194. Chemistry. Chemistry, like physics, treats of 

 matter, but in a different way. Physics is the science 

 of matter with regard to its motions, etc., whereas 

 chemistry is the study of substances with regard to 

 the kind of matter that is in them. For example, in 

 physics we have found and studied several forces and 

 their action, without much regard to the sort of matter 

 acted upon, while in chemistry we shall be constantly 

 dealing with kinds of matter, seeking to know what this 

 or that substance is made of, how it may be made, how 

 it may be destroyed, what can be made from it, and 

 the like. 



195. Chemical Changes. Matter may of course be 

 changed in many ways. The size, shape, or state of a 

 body may be altered; it may be hardened, heated, or 

 crystallized, etc. All such changes, which do not affect 

 the substance or kind of matter of the body, are called 

 physical changes. But when any substance is so acted 



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