What happens when you put aluminum foil around a lighted candle?

Question

For chemistry, we did this lab and did various things to a candle.
When we put aluminum foil around a candle, the flame got smaller and then bigger and then it died out.

I would like to know what happened to it chemically.

Other thing was that we put a flask over a lighted candle for a few minutes, then after that put limewater into the flask and mixed it. The limewater turned from clear to a murky grey.

I would also like to know what happened chemically.

Thanks.

Not really aluminum foil around a candle, but we made a slit in a small piece of aluminum foil, put through the candle wick, and then lit the candle.

Oh and can you also try to make your answer easy to understand?

I would appreciate that lots.

Thanks!!

Answer 1

The foil around the candle prevented oxygen for getting to the candle. As the candle burnt the co2 level increased, and the o2 level decreased. Hot air rising briefly caused a convection current which carried some extra oxygen to the candle, and it flamed up a little. Then consumed all the oxygen and extinguished itself.
The limewater turning milky is a chemical recation between the co2 and the limewater. a precipate forms. this is a standard indicator of the presence of carbon dioxide.

Answer 2

The limewater part is easy. This is a test for CO2, one of the products of combustion when you burn a hydrocarbon such as a candle. The lime water becomes murky through the formation of CaO from the Ca(OH)2

I'm not sure how you wrapped the aluminum foil around the candle. In principle, nothing should have happened unless you were depriving the candle of oxygen, so it went out. Otherwise, the candle flame is not hot enough to ignite the aluminum,