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H20 is hydrogen that has already burned. It can't burn a second time. When burn hydrogen, the "ashes" is water.

There are two ways water puts out fires. One, it turns to steam which blocks out the oxygen the fire needs to burn. Two, in turning to steam, water absorbs a tremendous amount of heat. That cools the burning materials to a temperature below their flash point so the stop burning.

2006-06-24 11:29:01 · answer #1 · answered by rt11guru 6 · 0 0

The H2O part. Water is not H2, it is H2O. Molecules have specific properties that are dependent much more on the molecule and less on the specific constituants. For example Chlorine is a poisonous gas, sodium is a metal that burns in water, but together sodium chloride is table salt and is very stable.
Overall there are only 88 natural elements, however, there are millions upon millions of different compounds all with different properties.

2006-06-24 19:17:07 · answer #2 · answered by satanorsanta 3 · 0 0

the compound h2o is totally different from h2 and o it may be made by the same elements but if you mix an acid and a base in the right proportions it becomes salt water and no longer poison so basically all of h2o put out the fire

2006-06-24 20:47:47 · answer #3 · answered by motorgeek 2 · 0 0

Atoms in a chemical compound react differently from a mixture of the elements. Your question is the equivalent of "why can't I breathe CO2 when it contains O2".

Water extinguishes ordinary fire because it cannot burn any further, takes up heat when evaporating, and displaces unburnt oxygen in the gaseous phase, interrupting the supply of oxydant.

I said ordinary fires because some substances like e.g. burning metals can react with water creating free hydrogen, which in turn will burn with air explosively. Burning oil cannot be extinguished with water either because the water will evaporate explosively when falling into oil at above 100°C and splatter the entire environment with hot, burning oil.

2006-06-24 18:41:00 · answer #4 · answered by jorganos 6 · 0 0

The water molecules dont actually break apart in the fire.

Fire is fueled by oxygen in the air. The water molecules smother the source of the fire, preventing more oxygen molecules from getting to it. This is why you can also put out a fire by throwing a blanket over it, the fire has no more oxygen to keep it burning.

(The oxygen molecules are not flammable when bonded together in a water molecule.)

2006-06-24 18:13:31 · answer #5 · answered by Steven B 6 · 0 0

Water is made of hydrogen and oxygen, but a compound has different properties from the elements that make it up. Water puts out fire by keeping the flames from getting oxygen. It suffocates the fire.

2006-06-24 18:21:11 · answer #6 · answered by Greg 1 · 0 0

When you run out of the H2 and the O there is nothing left to burn.

2006-06-24 18:11:19 · answer #7 · answered by Anonymous · 0 0

Nothing. It will keep burning until you run out of H2 or O2.

2006-06-24 18:11:38 · answer #8 · answered by Anonymous · 0 0

It takes two to tango. Hydrogen gas by itself cannot explode. It needs oxygen for that.

2006-06-24 18:23:17 · answer #9 · answered by Anonymous · 0 0

Where atoms/ions are bound together in a molecule they don't act like they used to.
Otherwise the sodium and chlorine in salt NaCl would kill you.

2006-06-24 18:13:18 · answer #10 · answered by Curious 1 · 0 0

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