If an inverted glass jar is put over a burning candle, resting in a shallow bowl of water, the candle?

Question

If an inverted glass jar is put over a burning candle, resting in a shallow bowl of water, the candle
burns for a few seconds longer and then goes out. Explain what happens to the water level inside
the jar, together with the reasons for this behaviour.

Answer 1

You have basically described the Bell-Jar experiment used to prove the existence of Oxygen being required for combustion and that it occupies approximately 20% by volume of the atmosphere at sea level.The water level rises because the Oxygen combines with the carbon to from CO2, and hence a partial vacuum is created inside the jar to the extent of the space occupied and the pressure exerted by the oxygen.
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Answer 2

I have a friend who taught biology, chemistry, and earth sciences, and I am waiting to get the answer back from him as I type. I suggest that you can go to www.drdino.com and click on the "contact" link and have them respond if you are in a hurry. The candle will only burn as long as it has oxygen, and I believ that it will draw the water up into the jar. When the great flood happened (back around 4004 B.C.) the earth originally had a "hyperbaric" type of atmosphere. There was awater-ice "canopy that was around the ozone. I say that because, as you know, the sun will x-ray you the whole time you stand out in it. It has "good" rays and "bad" rays. The only thing that will keep you protected is a lead umbrella or a cloudy day. The sun, just like the x-ray machine, shoots thousands of little x-ray, beta ray, and gamma rays, into your carcass everyday! That water/ice canopy collapsed and fell to the earth and as it hit earth's atmosphere it became condensation (a.k.a. rain) and hit the ground and began to rise and rise. So then, the question is, "What happened to the original atmosphere that was around the earth?" Since water is more "dense" than air, the atmosphere was "pushe up" and "out" into outer space. This would also tend to weight the earth down more, thus, making it heavier, and possibly pulling it out of it's original orbit. This is proven by simply pouring water in an empty glass. What happens to the air in the glass? It is pushed up and out into the atmosphere and gives place to the water. That is also why the earth is 4 days off in it's rotation around the earth more than likely. There was more vegetation back then, better air, no death, no war, no famine, things grew to huge proportions, and yes Virginia, there were dinosaurs! The word "dinosaur" didn't even pop into the dictionary until 1841! Before that they were called "dragons"! Simply big lizards that, in a perfect enviroment, never stop growing. But then we have the Smithsonian Institute that was put here to try to promote evolution and cover up the archaeological finds of "giant" things from years ago, like 9'-12' human skeletons. Check out the "Mizner Effect".

Answer 3

The O2 will be consumed and will take up less space, that will allow the water level to rise in the bell jar due to the drop in pressure in relation to the atmospheric pressure. A boiled egg will be drawn into a glass milk bottle when placed at the mouth of the bottle with the candle lit in the bottle.

Answer 4

The candle burns as long as the oxygen lasts, but when the oxygen is gone, the air pressure lessens so the water level goes up a little.

Hope that helps.

Answer 5

The candle will consume the oxygen in the glass; since the partial pressure of the oxygen is gone, the level of the water will rise slightly.

Answer 6

The water level will rise as the oxygen is burnt off by the candle.

Answer 7

sounds like a homework question - suffice to say not all the atmosphere is burnable Oxygen and any that is burn't has to be replaced (nature abhors a vacuum)