Oh, dude, O2H is the chemical formula for hydrogen peroxide. It's like that stuff you use to clean wounds or lighten your hair if you're feeling adventurous. Just make sure not to drink it, unless you're into that whole emergency room vibe.
The abbreviation of oxygen is O.
No, H2O shows that water has two atoms of hydrogen and one atom of oxygen in each molecule. O2H would mean two atoms of oxygen and one atom of hydrogen. The subscript follows the element it corresponds to.
The molecule formed will be water. H+ + OH- = H2O.
An example of a chemical formula for an acid is HCl, which represents hydrochloric acid. This formula shows the elements present in the acid – hydrogen (H) and chlorine (Cl) – and their relative proportions.