If you like us, please share us on social media or tell your professor. Consider building or adopting a Wikitext for your course like Prof. Dianne Bennett from Sacramento City College demonstrates in this video.

GeoWiki.png
ChemWiki: The Dynamic Chemistry Hypertext > Under Construction > Demonstrations > Additional Demos > The NO/CS2 Cannon

The NO/CS2 Cannon

Chemical Concepts Demonstrated

  • Complex stoichiometry
  • Exothermicity

Demonstration

  • A tube filled with NO gas is sealed with a rubber stopper.
  • CS2 is quickly added to the tube (the demonstrator is careful not to allow any air to be admitted, since NO reacts with oxygen to form NO2).
  • The tube is inverted to insure complete mixing.
  • The rubber stopper is then removed, and a lighted match is thrown down the tube.
cannon.gif

Observations

As the match travels down the tube, a massive flame and a loud roar shoot forth from the top of the tube.

Explanation (include important chemical equations)

The reaction witnessed involves a very complex stoichiometry:

5 CS+ 10.8 NO -> 5.4 N+ 2.6 CO + 2.4 CO+1.7 SO+ 8.3 S

The reaction is first-order in CSand second-order in NO.  The activation energy is 300 kJ/mol, which is the energy required to remove an S from CS2.  The energy released in this reaction is a whopping 3,280 kJ/mol.

Contributors

 

You must to post a comment.
Last modified
10:31, 2 Oct 2013

Tags

Classifications

(not set)
(not set)
(not set)

CORE

TEXTMAPS

WIKI-TEXTS

HOMEWORK

WORKSHEETS

This material is based upon work supported by the National Science Foundation under Grant Numbers 1246120, 1525057, and 1413739.

Creative Commons License Unless otherwise noted, content in the UC Davis ChemWiki is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. Permissions beyond the scope of this license may be available at copyright@ucdavis.edu. Questions and concerns can be directed toward Prof. Delmar Larsen (dlarsen@ucdavis.edu), Founder and Director. Terms of Use