Hey today my science teacher showed us a demonstration of water boiling. He used 4 flasks and they all had water in them. 3 of them did not boil when we had put it under a Bunsen burner however when we placed one of the flask, it had started boiling in like 5 second and after that we placed it under a faucet running cold water and it also started boiling. Anyone know why? All of the flasks had a cork on the top and they were all water nothing else inside of them, he even drank each one and so did others to prove that all of them was water.
2006-12-07 12:31:10 · 2 answers · asked by Revel' 1 in Science & Mathematics ➔ Chemistry
ALL of them had corks, by the way, even the one that boiled.
2006-12-07 13:10:49 · update #1
The boiling point of water changes with the vapor pressure.
If you have water in open flask it will boil at 100 degree Celsius or 212 degree fern height or 373 degree absolute.I am telling you the absolute scale because all gas laws are based on it.Now the reason 3 did not boil because it had cork on those and the pressure inside rose due to heat and thus it raised the boiling point.Now if you put one of those flask in cold water the water will begin to boil because the condensation of water vapors inside the flask reduced the pressure and there by lowered the boiling point of water.
2006-12-07 12:50:55 · answer #1 · answered by Dr.O 5 · 0⤊ 0⤋
Water boils when the vapor pressure inside the container is the same as the atmospheric pressure. The volume in the 4th flask is probably filled to a volume that will create a pressure equal to the atmospheric pressure once the flask is stoppered. This causes the water in the flask to boil much faster.
2006-12-07 20:40:37 · answer #2 · answered by Esmeralda 2 · 0⤊ 0⤋