STUDY OF OXYGEN. 7 



collect it in a fifth bottle as described in 

 2 and 3 above. 

 B. Properties of oxygen. 



1. What is the color of the oxygen obtained 



in 4 above? Remove the glass cover 

 from the bottle and smell of it. What 

 do you find? Inhale some of the gas 

 through the mouth. Has it any taste? 

 Enumerate, therefore, some of the phys- 

 ical properties (color, taste, odor) of 

 oxygen. What are the physical proper- 

 ties of the oxygen in the air? 



2. Prepare a burning spoon by tying a wire 



about a small piece of crayon. Place 

 upon the top of the crayon some phos- 

 phorus and light it. Remove the glass 

 cover from the top of one of the bottles 

 of oxygen and lower into it the burning 

 phosphorus. 



a. What do you observe? Does phos- 



phorus burn better in air or in 

 oxygen? What is the color of the 

 flame? 



b. What do you see in the jar in which 



the phosphorus has been burning? 

 Name this compound. (Compare 

 experiments J, A, 2, 4, 5.) 



3. Into a second bottle of oxygen lower some 



burning sulphur. 



a. What do you observe? Does sul- 

 phur burn better in air or in oxy- 

 gen? 



