$\require{mhchem}$

A propane torch is ignited, and a flame is observed.

Curriculum Notes 

$\ce{C3H8(g) + 5O2(g) -> 4H2O(g) + 3CO2(g) }$

This demo is used when introducing a unit on reactions, combustion, or redox reactions.

Safety Notes

Be sure that the area is clear of combustible matter and that a fire extinguisher is available to extinguish secondary fires.