Combustion of a Candle


 
 
Concept Explanation
 

Combustion of A Candle

If we observe a candle flame closely, we will notice the following:-

  • The wick burns and it stands in a pool of liquid wax.
  • There is a small portion of unburnt wick between the flame and the liquid wax.
  • The liquid wax is trapped in a cup of solid wax.
  • The liquid or solid wax never catches fire.
  • Conclusion:

    1. It is only the wax vapours that burn. Neither liquid wax nor solid wax burns.

    2. When a candle wick is lit, the heat produced from the flame melts the wax.

    3. The wick soaks or absorbs the molten wax.

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    Sample Questions
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    Question : 1

    In the candle flame there is a small portion of unburnt wick between the  _________________  and the liquid wax.

    Right Option : A
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    Explanation
    Question : 2

    Match the following

    Column -1              Column-2
    A Dark zone of flame P Rapid combustion
    B Source of heat and light in sun Q Incomplete combustion
    C Burning of LPG gas R Spontaneous combustion
    D Luminous zone  S Nuclear reactions
    E Burning of phosphorus in air at room temperature  T No combuistion
    Right Option : A
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    Explanation
    Question : 3

    Which of the following statements are correct?

    1) Yellow flames are ideal for heating.

    2) The substances which vaporise during burning give flames.

    3) Luminous zone contains unburnt carbon particles.

    4) The non-luminous zone has the highest temperture.

    Right Option : C
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    Explanation
     
     


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