The bunsen burner has 5 main parts.
1. Barrel - to raise the flame to a suitable height
2. Collar - to regulate the amount of air entering the air hole
3. Air hole - to allow air to enter
4. Jet - to enable gas to rush out
5. Base - to support the bunsen burner
- Gas Tap - to control the size of the flame
Types of flames:
Luminous
- orange in colour
- flame flickering and unsteady
- gas not burnt completely
- air holes are closed and very little air is allowed to mix with the gas
- not very hot
- carbon particles are deposited on apparatus
Non-luminous
- blue in colour
-flame burns steadily
- gas burnt completely
- hotter than luminous flame
- hottest part is above the tip at the blue zone
- air holes are open allowing air into the bunsen burner
(used in the lab for heating)
STRIKE BACK !
> occurs when too much air entering the air hole
> the gas burns at the jet
> turn of gas tap immediately and inform the teacher( do not touch any part of the bunsen burner)
Heating liquid in beaker:
1. put the wire gauze on the tripod stand
2. put the beaker of liquid on the wire gauze
3. light the bunsen burner and push it under the tripod stand
Heating liquid in the test tube:
1. hold test tube with test tube holder
2. ensure mouth of test tube is no pointing at anyone
3. slant the test tube of about 45 degrees
4. heat the test tube by moving it through the hotest part of the flame
5. liquid should be about one third of the test tube
Term 1 - lesson 3 - Bunsen Burner
