EXPERIMENTS AND EXERCISES 



A proper understanding of the experimental method is 

 absolutely essential for successful work in General Science. 

 Too often students fail to grasp the value of this work. 

 It is, therefore, all important that the right foundation be 

 laid at the beginning to understand and appreciate the 

 value of the experiment in the study of science. 



Experience has shown that much timers wasted owing 

 to the student's failure to properly perform the experiment 

 and apply it. The fact that constructive help will add 

 largely to the interest and understanding of the student 

 is a sufficient reason for giving much assistance which in 

 more advanced science courses would be unnecessary and 

 unwise. 



The experiments in blackface type are key experiments 

 and provide a minimum course. 

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PACK 



A Simple Example of the Experimental Method 8 



Transformation of Energy 18 



Preparation of Oxygen 23 



Chemical Action of Oxygen 24 



Properties of Oxygen 24 



Preparation and Properties of Hydrogen 24 



Production of Water 26 



Experiments with Carbon 27 



Inactivity of Nitrogen 27 



Preparation and Properties of Nitrogen 27 



Preparation of Carbon Dioxide 31 



Carbon Dioxide in Relation to Combustion 31 



Carbon Dioxide Formed in Breathing 32 



Air in Water 34 



Air in Soil 34 



Oxygen in Air 35 



Proportion of Oxygen in Air 35 



Air Occupies Space 38 



Air Exerts Pressure 38 



Air Has Weight 39 



Air Pressure Due to Its Weight 40 



be 



