Question

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

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.

Answer 1

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. 
3.   
   • Argon 
   • Nitrogen 
4.  
   • C_(s) + O_2(g) → CO_2(g) 
   • 2H₂ + O_2(g) → 2H₂O_(l)