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Experiment:To show the presence of unburnt gases in a Bunsen burner flame.

Answer Text:
Experiment:To show the presence of unburnt gases in a Bunsen burner flame.
Apparatus:
- Bunsen burner, tongs, narrow hard glass tubing.
Procedure
- A bunsen burner is lit and adjusted to get a non-luminous flame.
- A narrow hard glass tubing is held with a pair of tongs and one of its end s is placed in the colourless zone of the flame.
- A match is lit and placed at the free end of the glass tubing.
Observations.
- A flame is obtained at the free end of the glass tubing.
Explanations.
- The tubing trapped unburnt gases at the almost colourless zone of the flame.
- The trapped gases combined with atmospheric air (oxygen) at the other (free) end of the tubing hence the flame.
Conclusions.
- The almost colourless region contains unburnt gases.