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Questions and Answers
What causes the middle zone of a flame to appear luminous?
What happens to the carbon particles in the middle zone of a flame that causes it to appear as smoke and soot?
Why is the middle zone of a flame considered moderately hot?
What is the purpose of Activity 6 mentioned in the text?
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In which part of the candle flame are unburnt carbon particles found?
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What causes the circular blackish ring to form on the glass slide placed in the luminous zone of a candle flame during Activity 6?
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What is the main characteristic of the innermost zone of a candle flame?
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Which part of the candle flame contains unburnt wax vapour?
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In which zone of a candle flame is there enough air for complete burning of vapour?
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Why does the innermost zone appear black in a candle flame?
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What conclusion can be drawn from observing the burning of wax vapour in a glass tube introduced into the dark inner zone of a candle flame?
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What happens when a lighted matchstick is brought near the greyish-white vapour coming out from a glass tube inserted into the dark inner zone of a candle flame?
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Study Notes
Characteristics of a Candle Flame
- The middle zone of a flame appears luminous due to the presence of incandescent carbon particles.
- In the middle zone, carbon particles are not fully oxidized, resulting in the formation of smoke and soot.
- The middle zone is considered moderately hot because it has a lower temperature than the outer zone.
Activity 6 and the Luminous Zone
- The purpose of Activity 6 is to observe the formation of a circular blackish ring on a glass slide placed in the luminous zone of a candle flame.
- The circular blackish ring is formed due to the deposition of unburnt carbon particles from the luminous zone onto the glass slide.
Zones of a Candle Flame
- The innermost zone of a candle flame is characterized by a lack of oxygen, resulting in incomplete combustion.
- Unburnt wax vapour is found in the innermost zone of a candle flame.
- The outer zone of a candle flame has enough air for complete burning of vapour.
Observation of the Dark Inner Zone
- The innermost zone appears black due to the lack of oxygen, which prevents complete combustion.
- Observing the burning of wax vapour in a glass tube introduced into the dark inner zone of a candle flame reveals that the vapour ignites when it comes into contact with oxygen.
- When a lighted matchstick is brought near the greyish-white vapour coming out from a glass tube inserted into the dark inner zone of a candle flame, it ignites, indicating the presence of unburnt wax vapour.
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Description
Learn about the different zones of a candle flame, from the innermost zone lacking oxygen to the outermost zone of complete combustion. Understand the characteristics and composition of each zone.
