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The set up below was used to investigate the burning of a candle study it and answer the questions that follow.
set up used to investigate burning of a candle

  1. What would happen to the burning candle if the pump was turned off? Give a reason 
  2. State and explain the changes in mass that is likely to occur in tube A by the end of the experiment. 
  3. Name two gases that come out through tube C. 
  4. Write two equations for the reactions taking place when a candle burns.

1 Answer

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  1.  It would be extingushed 
    • This is due to build up of Carbon (IV) Oxide in the funnel around the burning candle 
  2.  Mass increases 
    • Calcium Oxide absorbs water to form Calcium Hydroxide then absorbs Carbon (IV) Oxide gas. 
    • Argon 
    • Nitrogen 
    • C(s) + O2(g) → CO2(g) 
    • 2H2 + O2(g) → 2H2O(l)  
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