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Hydrogen gas, H2, is less dense than air, and so it rises. By keeping the mouth downwards, the hydrogen will remain in the test tube.
The density of a gas is directly proportional to its molecular weight (see the Related Question about the density of oxygen and air to the left for why this is), and H2 gas is much lighter than air. The average molecular weight of the molecules in air is 28.97 grams per mole, but the molecular weight of hydrogen gas is only 2.01 grams per mole. Hydrogen gas is more than 14 times less dense than air!
What else can I help you with?
When hydrogen atoms are kept in water then type of bond between water and hydrogen?
hydrogen bond.
Why hydrogen is collected by downward displacement of water?
Because of two facts ;- #1 Hydrogen is the least massive (lightest) element, and will diffuse into the atmosphere very easily. #2; Hydrogen is an inflammable gas, so it needs to be kept away from flames/sparks etc., otherwise it will 'explode.'
Why tongs need to be kept near the top of the test tube?
Because sometimes in a lab,you use different and dangerous type chemicals so if for example,You pour a very chemical that uyou can't touch the test-tube and then you have to use the Tongs just so that you could be safe so I think that it is safe and the best idea to have tongs kept near the top of the test-tubes
How big of a tank should you get for a 7 inch large mouth bass?
A large mouth bass of 7 inches will need at least a 50-75 gallon tank to provide enough space for swimming and growth. However, as they grow quickly, it is recommended to have a larger tank to accommodate their adult size. An 80-100 gallon tank would be better in the long run for a large mouth bass.
What keeps DNA together?
DNA is held together by hydrogen bonds between the nitrogenous bases adenine (A) and thymine (T), as well as cytosine (C) and guanine (G). These base pairs form the rungs of the DNA double helix, providing stability to the overall DNA structure.
When hydrogen atoms are kept in water then type of bond between water and hydrogen?
hydrogen bond.
How do you get connected to the mercury?
When thermometer is kept inside the mouth
Will cigars mold in aluminum tubes?
Possible. If you have kept them in a humidor, not in excess humidity they should be fine.
Why is it important that the inner tube of the condenser is kept cold?
Importance to keep inner tubes of condenser cold
Why is it important that the inner tube of condenser is kept cold?
Importance to keep inner tubes of condenser cold
If your fish broke its mouth will it heal?
Provided it is kept in good conditions and fed properly its mouth should heal fairly quickly.
What would happen to the taste of a pretzel if kept in mouth for 15 minutes?
A pretzel would probably disintegrate if you kept in your mouth that long. If there's anything left by the time 15 minutes is up, it probably would be tasteless mush.
What kept Marquette and Joliet from reaching the mouth of the missipsspi river?
they were attacted by native Americans
Which is other place than mouth where thermometer is kept to measure body temperature?
Armpit
What phlebotomy tubes do not get spun in the centrifuge?
Gray top tubes with sodium fluoride/potassium oxalate additive should not be spun in the centrifuge as it can alter test results by causing hemolysis. These tubes are usually used for glucose testing and need to be kept upright to prevent mixing with cells.
What is there in chewing gum that made it all frothy when I kept it in water?
This is the person who asked this, like I was chewing an orbit and drank water and kept it in my mouth(didn't swallow the water/gum) and after a bit I saw in the mirror that the water in my mouth was all frothy.
How did they kept the name for hydrogen?
The name Hydrogen is derived from Latin words Hydro- means water and Genous- means to produce. hydrogen on combustion produces water molecules so the name is decided.
