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Dihydrogen (hydrogen gas) is highly flammable and will burn at concentrations of 4% or more H2 in air. The enthalpy of combustion for hydrogen is −286 kJ/mol; it burns according to the following balanced equation. : 2 H2(g) + O2(g) → 2 H2O(l) + 572 kJ (286 kJ/mol) When mixed with oxygen across a wide range of proportions, hydrogen explodes upon ignition. Hydrogen burns violently in air. It ignites automatically at a temperature of 560 °C. Pure hydrogen-oxygen flames burn in the ultraviolet color range and are nearly invisible to the naked eye, as illustrated by the faintness of flame from the main Space Shuttle engines (as opposed to the easily visible flames from the SRBs). Thus it requires a flame detector to detect if a hydrogen leak is burning. The explosion of the Hindenburg airship was an infamous case of hydrogen combustion; the cause is debated, but combustible materials in the ship's skin were responsible for the coloring of the flames. Another characteristic of hydrogen fires is that the flames tend to ascend rapidly with the gas in air, as illustrated by the Hindenburg flames, causing less damage than hydrocarbon fires. Two-thirds of the Hindenburg passengers survived the fire, and many of the deaths which occurred were from falling or from diesel fuel burns. H2 reacts directly with other oxidizing elements. A violent and spontaneous reaction can occur at room temperature with chlorine and fluorine, forming the corresponding hydrogen halides: hydrogen chloride and hydrogen fluoride

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Q: At What temperature and concentration does hydrogen explode?
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Related questions

What causes oxygen to explode?

A contact with hydrogen or organic compounds at a high temperature.


What causes oxygen machines to explode?

A contact with hydrogen or organic compounds at a high temperature.


How do you explode hydrogen without ignition?

Hydrogen can be made to explode in two different ways. The most usual way would be by combustion with oxygen, but that requires ignition. However, if you have liquid hydrogen you could make it explode by heating it, even in the absence of oxygen, in exactly the same way that water in a sealed container will explode if you heat it to the boiling point. Liquid hydrogen, of course, has a much lower boiling point than water does, and therefore would require less heating to make it explode. If it is not kept cooled, it will explode even at room temperature.


Can Hydrogen explode on its own?

Yes, when hydrogen explodes it produces water.


Can hydrogen gas relight a flame?

No. Oxygen gas relights flames. Hydrogen gas will explode in the presence of fire, giving a 'squeaky pop'


Concentration of hydrogen ions in solution is called?

Concentration of hydrogen ions in a solution is called: Acid concentration and pH = - log10(hydrogen ions concentration, in mol/l)


Do bases have a high or low concentration of hydrogen ions?

Bases have a low concentration of hydrogen ions. In contrast, acids have a high concentration of hydrogen ions.


Does temperature affect the pH level of different types of water?

yes, because temperature effects the concentration of hydrogen ions, which is what in turn effects pH values


Will hydrogen sulfide explode?

Yes. Hydrogen sulfide is extremely flammable.


How is a change in hydrogen ion concentration reflected in the pH?

pH is the negative logarithm of the hydrogen ion concentration; so an increase in hydrogen ion concentration give a reduction in pH. A reduction in hydrogen ion concentration causes an increase in pH.


What is the concentration of hydrochloric acid?

Generally this concentration is 36.5 %. However cocentrations up to just over 40% are possible but require special pressure and cool temperature conditions because the vapor pressure of the hydrogen chloride (which is dissolved into water to make hydrochloric acid) is high enough to cause evaporation of the hydrogen chloride out of the solution which then reduces the concentration unless you have the pressure and temperature conditions.


Does temperature affect the pH level of different types of water temperatures?

yes, because temperature effects the concentration of hydrogen ions, which is what in turn effects pH values