true Not very much, approx. 0,000055 %. Hydrogen and helium are the two elements you're LEAST likely to find in air - helium because it just floats off into outer space, and hydrogen because it reacts with other elements so readily.
Hydrogen doesn't exist in the air that we breathe. You can extract it from water though.
With baking soda, water, a nail, and an electrical current, you can separate water in to hydrogen and oxygen.
Air does not normally contain free hydrogen (H2). The only component of air that contains any hydrogen is water vapor, and it is easier to get H2 out of water in its liquid form using electolysis.
At room temperature nothing; with the influence of a high temperature and for some concentrations a disastrous explosion can occur.
Yes, but in such a very small amount that it is barely worth mentioning. Most of air is comprised of oxygen and nitrogen.
Highly Explosive!
this happens because hydrogen is lighter than air
You can mix it but it will not stay mixed. Like oil mixed with water, hydrogen is much, much lighter then the rest of the components of air and it will therefore separate out.
Iodine crystals
I think I will let SOMEBODY ELSE find out!
Depending on the concentration of the hydrogen peroxide, (if low enough) it will just decompose into water and oxygen gas. If the hydrogen peroxide is high enough in concentration it will just heat up and mix with the water (most likely the first will occur).
You get a mixture of hydrogen and xenon.
Helium is completely inert, it is the most inert of all elements, and so it will not react in any way with hydrogen (or with any other element). So, if you mix hydrogen and helium, nothing happens. You have a mixture of hydrogen and helium. It's a lot lighter than air, you can make balloons that will float. Of course, you can do that with pure hydrogen or with pure helium, as well.
water
this happens because hydrogen is lighter than air
It gets softer.
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You can mix it but it will not stay mixed. Like oil mixed with water, hydrogen is much, much lighter then the rest of the components of air and it will therefore separate out.
Iodine crystals
BOOM.
Hydrogen, H2, and a salt are formed.
i don't know but i do know that my mig welder needs pressured air and hydrogen to burn the metal
Neptunium react with hydrogen forming hydrides with formulas between NpH2 and NpH3.