viri THE BURNING OF INFLAMMABLE GASES 161 



C 2 H 6 H 2 -> C 2 H 4 



alcohol - water > ethylene 



It was shown to be a hydrocarbon by a group of Dutch chemists 

 who called it "oily carburetted hydrogen" (olefiant gas), from the 

 property which it possesses of combining with chlorine to form 

 an oily liquid, 



C 2 H 4 + C1 2 -> C 2 H 4 C1 2 

 ethylene + chlorine - ethylene chloride 



The volumetric relationships of these two gases were studied 

 by Dalton. They are as follows : 



By sparking, carbon deposited, hydrogen (2 vols.) set free. 

 CH 4 - C + 2H 2 



I VOL 2 



C 2 H 4 -> 2C + 2H 2 



I VOl. 2 VOls. 



By explosion with excess of oxygen 



CH 4 + 2O 2 -> CO 2 + 2H 2 O 



marsh gas -f oxygen > carbonic anhydride + water 

 i vol. 2 vols. \ vol. Contraction 2 vols. 



C 2 H 4 + 3O 2 -> 2CO 2 + 2H 2 O 



ethylene + oxygen -> carbonic anhydride + water 

 i vol. 3 vols. 2 vols. Contraction 2 vols. 



When exploded with less oxygen 



CH 4 + O 2 -> CO +' H 2 + H 2 O 



marsh gas + oxygen > carbonic oxide + hydrogen + water 

 i voL i vol. i vol. i vol. 



C 2 H 4 + O 2 -> 2CO + 2H 2 



olefiant + oxygen $> carbonic + hydrog 

 gas oxide 



I VOl. I VOl. 2 VOls. 2 VOls. 



Expansion 2 vols. 



