IRON 89 



the carbon. It contains less carbon than cast iron and 

 slightly more than wrought iron. Its carbon content 

 varies from practically nothing in some forms to a, 

 little less than 2% in others. Steel serves many uses 

 for mankind, from the steel rail to the main spring of 

 a watch. 



Questions 



1. Following are some of the properties of iron. 

 Classify them under the head of physical or chemical 

 properties: (a) it rusts easily, (b) melts at 1,200 

 degrees C., (c) has a specific heat of 0.114, (d) burns 

 in oxygen, (e) is magnetic, (f) has a density of 7.8, 

 (g) "dissolves" in hydrochloric acid. How would you 

 prove your answer for (g) ? 



2. Name a number of commercial uses of iron. 



3. How is it found in nature? 



4. Look up material on how commercial iron is 

 made from the ore and write an essay on it for class. 



5. Name the three different kinds of iron enumer- 

 ated in the text. 



6. How do they differ from each other? 



7. To what uses is each different kind put? 



