A YEAR IN SCIENCE 53 



phur. What is its nature? Color? Has it any odor? 

 Taste? Place some of it in a small beaker and cover 

 with water. Does it dissolve? 



With a very low flame slowly heat a little sulphur 

 in a test tube. What change takes place ? What is its 

 color? Continue to heat slowly and watch very care- 

 fully the change in consistency and color. When the 

 substance thickens and turns a darker color, continue 

 to heat it until it becomes a thin liquid and then pour 

 part of it into a beaker of cold water. Immediately 

 work the substance in the water with the fingers. 

 What is its nature? Is it elastic? 



Continue to heat the sulphur in the test tube. What 

 collects on the sides of the tube? What is it? Place 

 a little sulphur in the deflagrating spoon and ignite it. 

 Does it burn easily? What is the color of the flame? 

 Do the fumes have an odor? When sulphur burns it 

 forms a gas called oxide of sulphur, or sulphur dioxide. 

 Examine some roll sulphur. How does it differ from 

 the flowers of sulphur? 



Place some sulphur in the bowl of a silver spoon or 

 on a silver coin. Heat it slightly. What is the effect 

 of sulphur on silver? The compound formed is called 

 sulphide of silver. 



Enumerate the properties of sulphur you have 

 learned. 



Exercise 30. Iron. 



Object : To determine some of the properties of iron. 



