THE PROPERTIES OF MATTER. 



ECTJON H. 



THE PROPERTIES OF MATTER. 



13. Properties of Matter. Any quality that 

 "belongs to matter or is characteristic of it is called 

 a property of matter. 



Properties of matter are of two classes, physical and 

 chemical. 



14. What are Physical Properties t Physi- 

 cal properties are such as may be manifested 

 without changing the identity of the molecule ( 10), 



(a.} A piece of coal takes up room, it is hard and heavy, it can- 

 not move itself. These several qualities or properties the coal may 

 exhibit and still remain coal, or still retain its identity. They are, 

 therefore, physical properties of coal. 



15. What are Chemical Properties ? Chem- 

 ical Properties are such as cannot be manifested 

 without changing the identity of the molecule (11). 



(a.) A piece of coal may be burned ; therefore combustibility is 

 a property of the coal. This property has been held by the coal 

 for countless ages, but it never has been shown. Further, this 

 piece of coal never can show this property of combustibility with- 

 out ceasing to exist as coal, without losing its identity. When the 

 coal is burned, the molecules are changed from coal or carbon to 

 carbonic acid gas (C0 3 ). 



16. Experiment. Take a piece of ordinary sul- 

 phur (brimstone) and attempt to pull it in pieces; the 

 degree of its resistance to this effort, or its tenacity, 

 measures the attraction of the molecules for each other. 

 Strike it with a hammer, and it breaks into many pieces, 

 thus manifesting its Irittknm ; but each piece is ordinary 



