STUDY OF A MAZCK. ' $ 



3. (Dem.) Light some sulphur with a heated 



wire. What is the color of the flame? 

 Notice the smell of the burning sulphur. 

 In what other part of this experiment 

 have you noticed a similar odor? (When 

 sulphur burns it combines with the oxy- 

 gen gas of the air, forming oxid of sul- 

 phur.) 



4. (Dem.) Rub a bit of sulphur between two 



pieces of wood, as was done with the 

 phosphorus. What do you observe? 

 Why, then, is phosphorus put on the end 

 of a match? 



C. Water. 



1. After the wood of a match is burning well, 



hold it a little distance beneath the 

 mouth of an inverted dry tumbler. What 

 do you see on the sides of the glass? 



2. What is one of the substances, therefore, 



that is formed when wood burns? Why 

 is the tumbler used in this experiment? 



D. Carbon. 



1. When the wood of the match has been 



charred, extinguish the flame. (The 

 substance left is called charcoal or car- 

 bon.) What are some of the physical 

 properties of carbon? 



2. Heat the carbon red hot. Does it burn? 



How do you know? 



3. (Dem.) Thrust a piece of wood through a 



hole in the stopper that fits tightly in 

 the mouth of a bottle. Light the wood, 



