MadSci Network: Chemistry
Query:

Re: Do any other gases have the same characteristic as hydrogen?

Date: Mon Oct 19 08:51:10 1998
Posted By: Carlin Gregory, , Chemistry (BA and MS) in Synthetic , Williams Gas Pipelines - Texas Gas
Area of science: Chemistry
ID: 908675223.Ch
Message:

Very simply, yes.  Many will react with oxygen and cause that "pop".  The pop 
that you hear is caused by the rapid reaction between hygrogen gas and oxygen 
in the atmosphere to form a more stable molecule, water.  The reaction is so 
rapid and violent that you hear the expansion of the gases as they react.  It 
is actually a miniature sonic boom.  The expansion of the gases, as they react, 
exceed the speed of sound and you hear the "pop".   The reaction is simple:

     2H2 + O2 -------> 2H2O

Other gases such as acetylene,  methane, ethane, propane, to name a few, will 
react with oxygen to form more stable products.  For example, methane reacts 
with oxygen to form carbon dioxide and water:

  CH4 + 2O2 ------> CO2 +2H2O 

The reaction that you describe is on a very small scale.  Extreme care should 
be taken whenever dealing with potentially explosive combinations of gases.  It 
may be of interest to you to know that most explosions, ie TNT, nitroglycerine 
etc. are simply rapid expansion of materials to a gaseous state.



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