136 JUNIOR GRADE SCIENCE 



104. Define the term Density as applied to gases. If you were asked to 

 find the density of the gas resulting from the action of heat on potassium 

 chlorate, sketch the apparatus you would employ, and state how you would 

 proceed. 



105. Contrast the ancient view as to the nature of combustion with that 

 now held. What led to the adoption of the modern view ? 



