The flame go out on the Bunsen burner when the gas is turned off because there is no collision between the molecules of the gas.
A Bunsen burner can be defined as a small, adjustable laboratory equipment that is used to produce a single but continuously open gas flame, especially by mixing a flammable gas such as propane, with a controlled amount of air before lighting (igniting) it.
The collision theory states that a chemical reaction occurs when the reacting particles of a gas molecule collide with sufficient kinetic energy.
According to the collision theory, the rate of a chemical reaction is directly proportional to the collision between the molecules of its reactant.
For gas-phase chemical reactions, molecules must collide with sufficient kinetic energy to react and form a product in accordance with the collision theory.
In this context, the flame of a Bunsen burner would go out when its gas is turned off because the reacting particles in the gas molecules will no longer collide with one another.
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