When the air valve in closed a yellow luminous flame is observed due to carbon particles from in incomplete combustion.
Ch4 + 5o2 ------> co2 + 2h2o +302
Robert Bunsen added an air hole to it so it could have oxygen as well as gas. when the air hole is open the flame you get is blue and is hotter than when the air hole is closed, which then gives a yellow flame.
To change the flame of a Bunsen burner you must open or close the air valve, usually this is done by rotating the barrel.
See the figure at thge link below.
A normal Bunsen burner has a chimney which contains gas, a collar to adjust the air hole, a air hole that will leak gas, a gas tap that provides gas to the burner and the rubber tubing leads gas to the burner.
when you light up the burner you should see that the Bunsen burners air hole is closed that is the safest flame
It is closed to make a safety flame.
It is a luminous yellow flame. 🔥
Ch4 + 5o2 ------> co2 + 2h2o +302
The "air-hole" of a bunsen burner allows some of the flame to escape so that the heating flame does not become too hot. A flame that is too hot can damage laboratory equipment. When the air hole is closed it is a yellow sooty flame like the fires we have at home.
The two colours are yellow - when the air-hole is open, and blue - when the air-hole is closed.
it's to prevent a strike-back
When the hole of a Bunsen burner is half closed (or half open) the flame is mostly blue-violet in color throughout, with no orange/yellow apparent as it would be with the hole fully closed. When the hole is fully open, the flame divides into a pale voilet color outer part with a cone of intense blue color within.
Yes,it can .But it might take longer time to heat
It is less hot
The function that covers the air hole in a Bunsen burner is the collar.
The parts of a Bunsen burner has collar,base.air hole and barrel. Collar : Adjust size of air hole Base: Support Bunsen Burner Air hole: Allow air to enter air hole Barrel:To ensure the flame is adjusted to a suitable position