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Barking Dog Description A match is dropped in a tube, a loud whoosh is heard and bright blue light is seen! Explanation
The reaction of nitrogen monoxide, NO, (or
nitrous oxide, N2O) with carbon disulphide is similar to the
well-known reaction between hydrogen and oxygen, but is accompanied by a
characteristic “barking” sound. A mixture of nitric oxide and the vapor of
carbon disulphide, contained in a long tube, is ignited. The combustion wave
travels at a moderate rate down the tube compressing the gas ahead of it. At
a certain distance, dependent on the diameter of the tube, the residual
mixture explodes [1]. In a very long tube the passage of the explosion wave
may be seen. This reaction also produces a considerable amount of very
bright blue light and is one of few examples of chemical luminescence in the
gas phase."
still have questions? email us! explanation borrowed from Leeds University
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