A YEAE IN SCIENCE 57 



fumes given off from the burning charcoal ? To deter- 

 mine this pour some lime water into the bottle and 

 shake. 



3. Into the deflagrating spoon place some powdered 

 sulphur. Light the sulphur and lower it into a bottle 

 of oxygen. What is the result? After the sulphur 

 has burned, smell the fumes in the bottle. What are 

 they? How were they formed? 



4. Burn a pine splinter until a good ember is 

 formed. Extinguish the flame and thrust the glowing 

 ember into a bottle of oxygen. What happens? 



Does oxygen burn? Does it support combustion? Is 

 it found in the air? Why do you think it is or is not 

 found in the air? 



Summarize the properties of oxygen you have 

 learned from this exercise. 



Exercise 32. Hydrog'en. 



Object: To determine some of the properties of 

 hydrogen. 



Apparatus 



Granulated zinc Delivery tube 



Dilute hydrochloric acid Pneumatic trough 



Flask Pine splinter 



Test tubes Large mouth bottles 

 Thistle tube 



Directions: Place a handful of zinc in the flask. 

 Into the mouth of the flask insert a rubber stopper, 

 fitted with the thistle tube and the delivery tube. Pour 

 enough hydrochloric acid through the thistle tube into 



