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(i) Close the air hole of a bunsen burner and turn the gas tap full on. Light the gas and hold a piece of wire in different parts of the flame, moving it from the bottom to the top. Note the hottest place
in the flame. Open the air hole. Again hold the wire in the flame, moving from the bottom to
the top. Note the hottest place in the flame. Compare the two flames and note which has
the hottest point.
(ii) Close the air hole. Hold a test-tube with its bottom end just above the flame. Carbon
deposits on the glass. To test whether unburned carbon gives the yellow colour to the flame,
sprinkle powdered charcoal into the flame to see if this gives the same effect.
(iii) Open the air hole again. Note whether carbon deposits on a test-tube held in this flame.
Air mixing with the gas helps it to burn more rapidly and efficiently. To test what is in the
cooler inner cone hold a splint of wood in the flame so that it passes through the inner cone.
Note which part of the splint burns. Hold a piece of glass tubing with one end in the inner
cone then ignite the gas that comes out of the other end.
(iv) Investigate a candle flame and the flame of a spirit lamp in a similar way. Find the
hottest part of the flame. Test for unburned carbon particles in the flame. Look for an
inner cone of unburned gases.
sharon kalunda answered the question on April 12, 2019 at 06:40
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