If pure hydrogen and pure oxygen are both very flammable, why is water not?

Question

If pure hydrogen and pure oxygen are both very flammable, why is water not?

In: 1

Answer 1

Sodium is a highly reactive metal.

Chlorine is a highly toxic gas.

Surely when combined they’d make a chemical weapon right? Nope. Regular old table salt. Chemistry is much more complicated than that.

And to answer the question more directly, H2O is actually the product of burning hydrogen and oxygen, it doesn’t really want to burn again.