Question

Historically, which two gases combined to form water vapor?

1) Oxygen and Nitrogen
2) Hydrogen and Oxygen
3)arbon and Oxygen
4) Helium and Hydrogen

Answer 1

Water vapor is formed when hydrogen and oxygen combine.

Step-by-step explanation:

Water vapor is formed when hydrogen and oxygen combine. Hydrogen and oxygen atoms can mix in a 2:1 ratio to provide water (H₂O). This color change is due to the indicator being a weak acid or base that ionizes within a known pH range, exhibiting different colors in its protonated and deprotonated forms. This reaction is commonly seen when hydrogen gas reacts with oxygen in the air, as shown in the example of the zeppelin SS Hindenburg. The formation of water vapor can be represented by the equation 2H₂ + O₂ → 2H₂O.