56 



LABORATORY MANUAL 



stopper carrying the delivery tube. Place the free 

 end of the tube in the pneumatic trough. Place the 

 flask on the wire gauze over the flame of a Bunsen 



Fig. 19. 



burner and heat gently. By heating the mixture a gas, 

 called oxygen, is given off. Allow the first gas from 

 the flask to escape. Why? Then place the delivery 

 tube under the mouth of an inverted bottle filled with 

 water. When the bottle is filled with oxygen, cover 

 it with a glass plate and set it aside. Fill five other 

 bottles with oxygen in the same manner. 



1. Examine the gas in one bottle. Has it any color? 

 Any odor? 



2. Place a piece of charcoal in the deflagrating 

 spoon and heat it until it glows. Quickly thrust it into 

 a bottle of oxygen. Note the result. What property 

 does this show oxygen to possess? What are the 



