Not much!
Some of it, a tiny amount, might bond to the water molecules, but as water already has its standard H2O composition, most extra hydrogen will simply bubble out, hydrogen being lighter than water.
For details and discussion of hydrogen bonding with water, see Related Links below these advertisements.
The solubility of hydrogen gas in water at 0oC is 0.0019 grams of hydrogen per kilogram of water. At 60oC, the solubility is 0.0012 grams of hydrogen per kilogram of water. That is a tiny amount that will dissolve in the water. The rest would simply bubble out as the previous answerer said. Also, most likely, the water would be already saturated with hydrogen since it was in contact with the atmosphere, which contains hydrogen; so unless you took steps to purge the hydrogen from the water to get water not already saturated with hydrogen, all of the added hydrogen would bubble out since the water would be already saturated with hydrogen.
A water molecule is made up of 2 hydrogen and 1 oxygen. I don't understand the question. It sounds like you want to test for water parts using water?
Hydrogen does not react with water
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).
Just rinse out with water asap
When water is broken down chemically the hydrogen and oxygen atoms split apart from on another and rearrange into diatomic hydrogen (H2) and oxygen (O2) molecules. 2H2O --> 2H2 + O2
Hydrogen bonds is the process when hydrogen atoms interact and are attracted to other atoms such as nitrogen. It happens naturally in substances like water.
Cesium reacts violently with water, forming cesium hydroxide and releasing hydrogen gas.
Hydrogen does not react with water
Combustion
Potassium metal will react violently with water to form KOH and hydrogen gas. Due to the heat released by the reaction - the hydrogen gas will ignite. So: placing potassium in water will cause a fire!
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).
Calcium reacts slowly with water. The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2).
The hydrogen will dissolve
water is left
water
Hydrogen is released in the atmosphere.
Perchloric acid is dissociated in water.
The Hydrogen will burn fiercely with a lambent blue flame and water will be produced.
A chemical reaction between oxygen and hydrogen occur.