Physical science1 of 2
What is the chemical formula for water?
The answer
Answer: B. A water molecule has two hydrogen atoms bonded to one oxygen atom, written H2O. HO has only one hydrogen and is the hydroxyl group. H2O2 is hydrogen peroxide, with an extra oxygen atom. H3O is the hydronium ion (H3O+), formed when water gains a hydrogen ion.
Source: ASVAB - General Science: Physical Science - Chemistry Basics
