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Gas produced during reaction will produce bubbles due to the property of surface tension of the liquid. Air or gas is less denser than the liquid in which it is produced. Also due to Archimedes principle, the weight of the liquid displaced by the air or gas bubble will be more than that of bubble itself. So upward buoyant force is heavy which pushes the bubbles to the top of the test tube.

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โˆ™ 2009-10-20 17:04:20
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Q: How does an air bubble collect at the top of a test tube?
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How do you collect unbreathed air?

Any 'empty' container is really full of air, so you don't have to do anything. Pick up a test tube. It's full of air.

How does an air thermometer work?

An air thermometer has a bubble of liquid inside the tube and when the air inside of the tube heats up or cools down, the air takes up either more or less space inside of the tube, causing the bubble of liquid to either move upwards or downwards, indicating the temperature.

How do you find the weight of air?

When finding the mass of air, you need to have a test tube and a stopper. Measure the mass of the test tube and the stopper together. Then, make sure that the air gets in the the tube and put the stopper on. Recheck the mass of the air, test tube, and stopper and subtract just the tube and stopper from the newly recorded mass to find the mass of air.

If an inverted tube containing air is placed above a test tube of hydrogen why would the tube of air give a positive test for hydrogen after a few minutes?

This would happen because of the process of diffusion. Hydrogen molecules would move from the hydrogen test tube where they are highly concentrated to the air test tube where their concentration is low.

Is a test tube holder the same as a test tube clamp?

no a test tube clamp holds it in the air so you could use it on a... bunsen burner where as a test tube holder is for well holding test tubes and sometimes they mite have chemicals in them

Why do scientists collect and test air samples?

Scientists collect and test air sample because they want to see how clean/polluted it is. Then they can raise awareness to people if needed.

How do you smell a substance in a test tube?

Hold the test tube around 30 cm away from your face then waft the air above the tube towards you and sniff.

Heated test tube using burner with closed air holes?

Heated test tube with a bunsen burner with closed air holes would result to the test tube having some kind of black material at the bottom, it looks like a burnt coal that stick to the bottom of the test tube. This happens because the flame is not a good flame.

How is smelling the contents of a test tube done safely?

Never put your face directly over the test tube. Use your hand to fan the air above the test tube toward you and smell that way.

How does a spirit level indicate level?

A bubble of air is in a small slightly curved tube of alcohol. The bubble will float at the highest point and indicate level or not level.

How do you know hydrogen is there in the air?

First take test tube (an empty test tube) hydrogen is colorless ,tasteless and odorless. (it is also very light that why weather balloons are filled with hydrogen). Then put a burning splint at the mouth of the test tube and you know that there is hydrogen in the air because hydrogen burns with a pop when it is mixed with air so now you know that there is hydrogen in the air.

Is it possible to jump 7oinches in the air?

You test tube baby

What is a 13x100 test tube and its use?

13x100 test tubes are excellent when you need to have larger volume in a test tube. These larger tubes allow more air to touch the sample.

What happens to gas that is more dense than air in a test tube mouth up and mouth down?

Test tube mouth up: nothingTest tube mouth down: the denser gas can escape

Why a tightly fitting cork on a test tube is blown off if the test tube is heated?

The air molecules inside the test tube have a higher mobility when heated (they move around more). The collisions between these air molecules create more pressure on the inside of the test tube (force/area, where the force is the result of the increasing collisons and the area is the internal wall of the test tube.) This may result in the pressure inside of the test tube to be greater than the outside atmospheric pressure on the cork (actually atmospheric pressure on the cork and the frictional force on the cork created by the mouth of the test tube). If the internal pressure becomes greater than the external pressure (plus frictional force) the cork will come loose of the test tube.

When it becomes impossible to remove air from a water bubble?

A water bubble is made of air. If you remove the air from it it will not be a bubble anymore.

What do you use to clean test tubes?

To clean a test tube use isopropyl alcohol and a test tube brush. Then wash with hot soapy water and rinse with hot water. Allow the test tubes to air dry.

Why an empty test tube placed in water in a beaker with mouth outside the water surface shines like a mirror when seen at certain angle?

the test tube has air inside it.In the outer surface of the test tube is water.Due to the different media across the test tube surface the reflection of light occurs through the glass surface.Hence the test tube shines(behaves)like a mirror

Why do we have to heat the test tube in a 45 degree manner?

If you heat the test tube from the bottom, any liquid can turn into a gas. ... Heating the tube at an angle reduces the pressure on the heated substances again allowing the gases to escape harmless into the air.

Why did sicentist in 1800s use kites to collect data?

to test data high in the air

What effect does the anhydrous calcium chloride have on the air in test tube?

It dries it - in other words, it removes the moisture from the air.

What is the source of the air bubble that may form in the Durham tube?

Gas, whereas other may form both acid and gas.

What is contained in the top part of an inverted test tube?

That depends on the circumstances. If you just pick it up and invert it, it's air. If you fill it with water and invert it in water then it's water. If you use it to collect a gas, it is the gas you are making.

Why reason for flaming the mouth of test tube?

Flaming the mouth of a test tube creates an air flow. Hot air rises. Therefore dust/particles in the air are less likely to fall into your tube. There is some controversy as to the value of this action. The hot air will also create eddy currents across the mouth of the tube or flask which may actually increase the opportunity for contamination. If there is some data which supports either view, I would like to see it. In my opinion, the reason behind flaming the mouth of a test tube has not been proven, it is just taken to be dogma.

Does a 91 Camaro need a catalytic converter with an air tube?

A stock 91 Camaro that has all its original emissions equipment would need an air tube for the AIR system to function properly and pass an emissions test. However, if you have removed the air pump and related systems, an air tube wouldn't be needed.