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Why air bubbles are observed in the water when the round-bottomed flask is heated?
Wiki User
∙ 13y ago
Great question!
You may notice that air bubbles form of the bottom of the flask, long before it starts boiling, but it can't be evaporation, because that only occurs at the surface, so what is it?
Well, as you know, there is oxygen "dissolved" in water (that is how fish and other marine life can survive in water). When water is heated, it actually not able to hold as much dissolved gas (which is the opposite of dissolved solids in water, the water can hold MORE when it is heated). This is because a gas is naturally more energetic then the liquid, so as it heats, its desire to escape from being dissolved grows faster then the liquids ability to hold it, so the water cannot hold as much.
Well, as it heats, the air begins to escape and form bubble. these often happen at the bottom of the flask, because that water is heated first and fastest (so air escapes from them the soonest).
Wiki User
∙ 13y ago
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Is the volume occupied by the gas in the flask approxmately the same greater or less than before it was heated?
Assuming the flask is sealed - the volume remains the same but the pressure increases
What are distillation bumping flasks?
When a liquid boils, it will change in volume by a large amount. This 'change of phase' as it is known will expand the bubble away from the flask. According to the laws of reaction, this will give the flask a push in the opposite direction, and the flask could jiggle.However, boiling of liquids, or change of phase in general, takes place at a tiny point only. At a tiny imperfection, not over a region. [Notice how the bubbles in a soda drink appear to come from discrete points on the container?]Into a bumping flask we introduce some inert material (perhaps glass beads - perhaps plastic chips?) so this introduces imperfections into the process, and enables the boiling to take place more easily. And that means in a less energetic fashion. The bubbles should be smaller.I trust this is the bumping flask to which you refer.
Does the flask contain the same more or fewer gas molecules compared to before it was heated?
The same if it was closed (i.e cork). If it was open, it would be less, as gas usually expands as it is heated, and it depends on the amount of heat, the pressure, temperature etc.
What is flat bottom flask?
A flat bottom flask would be an Ehrlemeyer flask, which is used quite a lot by chemists.anf
What is a heating mantle and how do you use it?
A heating mantle is the best way to heat a liquid in a round bottom flask. The heating mantle can be either rigid or soft, but heats the flask by heating an electric coil which surrounds the round bottom flask. Heating mantles come in different sizes to best match the size of the found bottom flask for a snug fit around the entire bottom of the flask. They are commonly used in distillations and other heated reactions.A heating mantle if much better than a hot plate because the heating mantle makes contact with the entire bottom surface of a round bottom flask. It is also much better than a Bunsen burner for heating flammable liquids.See the Related Questions and Web Links to the left for more information.
Why will there be air bubbles forming when water is being heated?
As the flask expands,hor air is being pushed out,therefore,air bubbles are formed.
What happen if a flask is heated on a flame with a wire gauze?
- the flask is protected - the liquid is heated more uniform
Why does the egg go in to the flask when heated?
When an egg is heated, the protein present within it(the egg white), called albumin gets denatured. This is because protein structures break at high temperatures. As a result, the liquid albumin forms a thick white mass.
Is Erlenmeyer flask good of heated solid?
The Erlenmeyer flask is not good for heating solids.
What will happen after some time when the empty flask was heated over the burner?
nothing , after a while the flask material will break down
What happens when a flask is heated up with a burner after ten minutes?
It will be getting hot
Is the volume occupied by the gas in the flask approxmately the same greater or less than before it was heated?
Assuming the flask is sealed - the volume remains the same but the pressure increases
What is the use of florence flask in laboratory?
The Florence Flask is used for heating subtances that need to be heated evenly. The bulbed bottom allows the heat to distribute through the liquid more evenly. The Florence Flask is mostly used in distillation experiments.
What process causes iodine vapor to collect in a flask of solid iodine?
Procrastinator, you should have started your Enrichment earlier.
What are the dangers of looking down through flask with boiling liquids?
Fumes can come out and burn your face and nose, and if you are not wearing safety goggles, the popping bubbles can splash in your eyes.
What are distillation bumping flasks?
When a liquid boils, it will change in volume by a large amount. This 'change of phase' as it is known will expand the bubble away from the flask. According to the laws of reaction, this will give the flask a push in the opposite direction, and the flask could jiggle.However, boiling of liquids, or change of phase in general, takes place at a tiny point only. At a tiny imperfection, not over a region. [Notice how the bubbles in a soda drink appear to come from discrete points on the container?]Into a bumping flask we introduce some inert material (perhaps glass beads - perhaps plastic chips?) so this introduces imperfections into the process, and enables the boiling to take place more easily. And that means in a less energetic fashion. The bubbles should be smaller.I trust this is the bumping flask to which you refer.
Does the flask contain the same more or fewer gas molecules compared to before it was heated?
The same if it was closed (i.e cork). If it was open, it would be less, as gas usually expands as it is heated, and it depends on the amount of heat, the pressure, temperature etc.
