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water.....why is it stable?

if you combine 1 atom hydrogen which is extremely flamable. and 2 atoms of oxygen which is required for combustion, why does it form water, which puts fire out?

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The force of the combustion is also that which extinguishes it...

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Let's look at the elements present in water. H2O is composed of two hydrogen atoms and one oxygen atom. We know that chemical reactions occur because atoms try to gain or lose electrons to form a stable octet, or a valence shell of eight electrons. Oxygen has six electrons in its valence shell, so it needs two to become stable. Hydrogen has one electron in its valence shell, which is why it's so reactive. When hydrogen and oxygen are combined, the one electron each of the two hydrogen atoms joins the six electrons of the oxygen atom, which stabilizes the resulting compound with a combined octet. Now the valence shells are happy and they will not react easily.

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Energy is conserved.

All that heat and explosive power you get when hydrogen and oxygen combine? You'd have to put that back in to break up water.

Still there are things that bind to oxygen even more. potassium is one, and you can not put out a potassium fire with water.

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