There is one atom of hydrogen in a hydrogen molecule.
NO. Hydrogen gas is non-toxic. However, it can displace oxygen (and if hot enough burn in it) and thus can be an asphynxant in large quantities. But hydrogen by it self is not toxic at all.
Hydrogen Peroxide itself is as colorless as water. Hydrogen peroxide solution is a bit ambiguous, and could vary with what you mean by "solution".
Hydrogen gas is non-toxic but it is highly flammable (or explosive) so it could easily cause you to burn to death; in addition, if you were to breathe pure hydrogen you would die in a few minutes from lack of oxygen.
Hydrogen is a fuel for combustion, but cannot support it in the manner than oxygen can.
Water itself does not burn, as it is a compound made of hydrogen and oxygen. However, hydrogen, which is a component of water, can burn under specific conditions. Hydrogen can burn in the presence of oxygen and an ignition source, such as a spark or flame. This reaction produces water vapor and heat.
All stars 'burn' hydrogen
No hydrogen will not burn in the absence of air unless another oxidizer is present.
No, water itself cannot catch fire because it is a compound made of hydrogen and oxygen. However, the hydrogen in water can be ignited and burn if it is separated from the oxygen.
helium does not burn, hydrogen will burn in air
Hydrogen is an explosive gas- remember the Hindenberg! This is regular Hydrogen not the radioactive variety- the H-bomb so powerful it needs a regular nuclear bomb to act as a detonator, a double-flash indeed.
No, an autoimmune disorder will not *burn itself out*.
Hydrogen gas is highly flammable; you can make it burn with the slightest spark.
Yes. When you burn hydrogen the product is water. If you pass an electric current through that water you can split it back into hydrogen and oxygen.
You don't. Sea water is the combustion byproduct of hydrogen. That is, water is water you get when you burn hydrogen.
None, because hydrogen doesn't burn all by itself. It needs oxygen and there is none in the fuel tank. It will burn if the tank leaks and there is an ignition source. But it is not explosive by itself.
When you burn hydrogen and oxygen, the molecules combine to form water (H2O).