Question

if you cover a burning candle with an inverted cup, the flame dies out after a bit. what is it that the flame cant get to?
a oxygen
b carbon dioxide
c water vapours
d wax

Explanation:

Combustion (burning) requires oxygen. When a burning candle is covered with an inverted cup, the oxygen inside the cup is gradually consumed. Once the available oxygen is used up, combustion (which sustains the flame) cannot occur. Carbon dioxide (\(CO_2\)) is a product of combustion and does not support burning. Water vapour (\(H_2O\) in gaseous form) is also a combustion product and does not aid in burning. Wax is the fuel for the candle, but when covered, the lack of oxygen (not lack of wax) causes the flame to go out as the wick (which draws up wax) still has access to the wax initially.

Answer:

A. oxygen