Explain the following: You add 100 mL of water to a 500-mL round-bottom flask and heat the water until it is boiling. You remove the heat, stopper the flask, and the boiling stops. You then run cool water over the neck of the flask, and the boiling begins again. It seems as though you are boiling water by cooling it.
2006-11-23 08:33:05 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
What I can see in your experiment is that at the moment you stopper the flask is like letting that water vapour condenses and a partial vacuum is created.
At the moment you cool the neck of the flask, there is a sudden change of temperature that lets that pressure vapor of hot water will be higher that the air below (due to the partial vacuum) and boiling begins again.
I would like to read other opinions.
Good luck!
2006-11-23 08:40:40 · answer #1 · answered by CHESSLARUS 7 · 0⤊ 0⤋
Its the steam man, the glass gets so hot from the boiling. And because glass has a slow cool down rate, when you apply water back to it, off ther burner it will start boiling again.
2006-11-23 16:40:40 · answer #2 · answered by Project EX 3 · 0⤊ 0⤋