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People often think that the reason is because the oxygen gets burned up, creating a vacuum into which the water is sucked, but this is not true. The reason is that the candle heats up the air in the jar, which causes it to expand. The expanding air is pushed through the water at the bottom. Note that at this stage the candle goes out. There is now no flame to heat the air and so it cools down, which makes the air shrink. This is what creates the vacuum that "sucks" the water up.
But the oxygen is burned up, so doesn't that reduce the volume of the gas?
Yes, the oxygen is burned up, but the chemical reaction between the candle wax and the oxygen produces carbon dioxide of roughly equivalent volume.
Does the flame go out because the oxygen gets used up?
Actually no. You can show that not all of the oxygen is used up when a candle burns in a bell jar by putting a mouse in the jar, which will stay alive. In fact the changing dynamics of the gases in the jar (increasing carbon dioxide produced in the combustion of wax, decreasing oxygen as it is used up in the combustion) contrive to prevent adequate oxygen from reaching the flame for the combustion reaction to continue.
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When you put a jar over a burning candle in a tin pan with a little bit of water why does the water rise?
the water rises because the oxygen is used up by the candle to burn and the water takes the place of the oxygen but does not the carbon dioxide formed take the place of the oxygen burnt?
What change in the water level occurs when you hold Erlenmeyer flask over a candle in a pan of water?
When you put a flask over the candle in a pan of water, the water in the pan starts to slowly rise inside the flask, and as the water slowly starts to rise, the candle slowly burns out.
When you put a jar over a burning candle in a tin pan with a little bit of water why does the water rise to take the place of oxygen burnt why not the carbon dioxide formed?
Nice question. The oxygen burn forms carbon dioxide,which is soluble in water being polar,so water rise up.It takes the place of CO2.
Why does the water level rise when a bell jar is on top of a candle?
Because the candle takes some of the oxygen out of the air inside the cup, converting it into compounds with the candle material that have less volume than the oxygen had. This lowers the air pressure inside the cup, and the water level rises to compress what's left, until the pressure inside and outside the cup are again equal.
Is smog caused by burning fossil fuels?
I think so, i believe that the fumes/smoke ect rise up and combine with the water in clouds to from dark clouds. Smoke+Fog=Smog
When you put a jar over a burning candle in a tin pan with a little bit of water why does the water rise?
the water rises because the oxygen is used up by the candle to burn and the water takes the place of the oxygen but does not the carbon dioxide formed take the place of the oxygen burnt?
What change in the water level occurs when you hold Erlenmeyer flask over a candle in a pan of water?
When you put a flask over the candle in a pan of water, the water in the pan starts to slowly rise inside the flask, and as the water slowly starts to rise, the candle slowly burns out.
When you put a jar over a burning candle in a tin pan with a little bit of water why does the water rise to take the place of oxygen burnt why not the carbon dioxide formed?
Nice question. The oxygen burn forms carbon dioxide,which is soluble in water being polar,so water rise up.It takes the place of CO2.
How to measure oxygen using a lit candle?
Remember the percentage of oxygen in the world today is 21%. Get a lit candle and put it on water. Then put a beaker over the lit candle. The water should rise and fill up to 21% of the candle as there is 21% of oxygen in the world.
How can you prove that air is a mixture?
Stand a large beaker full of air upside down over a container filled with lime water which has a lit candle (tea light, night light) floating on its surface. The flame from the candle will burn off the oxygen in the air which will cause the water to rise within the beaker. The water won't rise right up to the top which proves that their are other substances besides Oxygen in the air. And before you say that it is just the Carbon dioxide which has been produced by the burning of Oxygen, that is why Lime water was used. Lime water absorbs Carbon dioxide. So, whatever remains in the beaker is neither Oxygen or Carbon dioxide.
How long can a candle burn under beakers of different sizes?
This delightfully simple experiment may be used to estimate the percentage of oxygen in the air. Assumption is that all the Oxygen is consumed. Mount candle on a small watchglass floating on water, light the candle, and place an inverted beaker over the whole to create a water seal. Measure the rise of the water inside the beaker.
Why does a candle smoke when it's blown out but not while it's burning?
you may not see it but once you blow out the candle, small embers are still inside the wick of the candle and burning. because the embers are so small thriving off the air particles thus creating the smoke you see.Additional answerIt does smoke while burning, if you look closely enough. In fact, if you put a piece of glass or tin above the flame it will become blackened with smoke particles (carbon).
Why does the water level rise when a bell jar is on top of a candle?
Because the candle takes some of the oxygen out of the air inside the cup, converting it into compounds with the candle material that have less volume than the oxygen had. This lowers the air pressure inside the cup, and the water level rises to compress what's left, until the pressure inside and outside the cup are again equal.
Why does smoke rise rather then fall from a lighted candle?
floating candles float higher in the water a they burn because as the candle burns it is decreasing its mass and deplacing less water, so it floats higher....but im not sure? its burning off the wax and makes the candle more buoyant which means it just burns off weigh... sorry for answering so late... enjoy
Do liquids expand?
Yes. liquids expand. If we heat the beaker which is filled with water using a candle, the volume will rise as the water is mixed with hot air. Hot air would want to excape, therefore liquids do expand.
Why when you burn a candle the mass decreases?
Maybe a better question is whether a candle AND it's combustion products gets heavier or lighter. Since a candle uses the oxygen from the air, the total mass gets heavier than the original candle.
What are some examples of products that produce carbon dioxide around the house?
A candle, gas or wood stove, gas water heater or a gas or oil furnace all produce carbon dioxide by burning hydrocarbons.Baking powder and yeast make bread rise by producing carbon dioxide, although by very different methods.Children are products of human reproduction that produce carbon dioxide.
