EXERCISE 27 



A PKODUCT OF THE BUBKENG CANDLE 



Materials. A candle (an alcohol lamp or Bunsen burner may be used) ; a piece of metal. 



Directions. Hold a cold metallic object in the flame or just above its tip. Remove the object in 

 a few moments before it becomes warmed. What, apparently, is the substance, other than soot, 

 which has collected on the surface of the object? 



Additional problems. If an alcohol lamp or a Bunsen burner is available, repeat the experiment, using 

 these flames. Compare results. 



Hold a dry drinking glass over a flame to see if the same results are shown. 



When a kerosene lamp is first lighted what is the source of the water which collects on the inside of 

 the lamp chimney ? 



When a kettle of cold water is placed over the flame of a gas stove, drops of water often collect on the 

 bottom, of the kettle. Explain. 



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