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

    The heat produced by burning 1 gm of fuel completely is known as_____________________.

     

                               

    Right Option : B
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    Explanation
    Question : 2

    Daily use candles (paraffin wax) contain-

    Right Option : A
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    Explanation
    Question : 3

    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
     
     


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