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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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โˆ™ 2008-11-18 21:54:58
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Chemistry

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

What makes oxygen 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.


What would cause an oxygen tank to explode?

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


Can hydrogen be safe and not explode?

it is not safety it will not explode


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.


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)


What causes hydrogen to explode?

ignition


Can Hydrogen explode on its own?

n0


Why is hydrogen gas so dangerous?

hydrogen is dangerous because it can explode and cause a massive fire hydrogen is dangerous because it can explode and cause a massive fire


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.


Will hydrogen sulfide explode?

Yes. Hydrogen sulfide is extremely flammable.


What happens to hydrogen ion concentration as you decrease the Ph?

Hydrogen ion concentration increases.


Does hydrogn implode or explode?

Hydrogen explodes.


Will hydrogen explode when it comes in contact with water?

no


What two chemicals explode when mixed?

Hydrogen peroxide and petrol would probably explode. ----- Some examples are the following: - hydrogen peroxide and acetone in the presence of an acid - hydrogen peroxide and acetic acid - hydrogen peroxide and sulfuric acid - hydrogen and oxygen at high temperature - nitric acid and reducing agents (ex.: hydrazine) - silver salts and ammonia in the presence of a strong base


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 scale measures the concentration of hydrogen ions?

The pH scale is a measure of hydrogen ion concentration.


Which solution has a greater concentration of hydrogen ions?

An acidic solution has a greater concentration of hydrogen ions.


When pH decreases does hydrogen ion concentration increase or decrease?

hydrogen ion concentration decreases


What is the concentration of hydrogen ions commonly expressed as?

The concentration of hydrogen ions is commonly expressed as pH.


Which substances decrease the hydrogen ion concentration in a solution?

Adding a base the hydrogen concentration decrease.


Which substances decrease the hydrogen ion in a concentration solution?

Adding a base the hydrogen concentration decrease.


How do you distinguish between hydrogen peroxide and water?

Hydrogen peroxide explode by heating.


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


What is the pH of a hydrogen solution that has a hydrogen concentration of 10-2?

If concentration of Hydrogen in solution is 10-2 then its pH must be 2.