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In the previous experiment you have extinguished a burning candle in a jar by covering it by a cap. The consumed air contained carbon dioxide.
Carbon dioxide from Cola and from an effervescent tablet will be used for fire extinguishing in the following experiment.
What you need:  3 infusion bottles 50 mL, Cola fresh and stale, matches, effervescent tablets, water, balloon, jar with a burning candle.
(effervescent tablets may be replaced by baking powder and vinegar).
Experiment with Cola:
a) Transfer fresh cola into an infusion bottle.    Cover it with a stopper for one minute.
b) Add the same quantity of stale Cola to a second bottle.
c) Left and photo 2: Dip a burning match into the bottle with stale Cola and into the bottle with fresh Cola.
Write down your observations. Try to explain them.
Experiment with effervescent tablet
a) Put one tablet to the third infusion bottle. b) Fill about 15 mL water into a balloon.
c) Close the bottle with the balloon without adding water to the tablet.
d) Lift the balloon to mix the water with the tablet now.
e) Photo 3: Wait one minute. Remove the balloon with gas from the bottle: Close the balloon tightly during this operation.
g) GLOWLY transfer the gas from the balloon into the jar with the burning candle.
EWrite down your observations. Try to explain them.