What does a water molecule (H2O) contain?

• A. 1 hydrogen atom and 1 oxygen atom
• B. 2 hydrogen atoms and 1 oxygen atom
• C. 3 hydrogen atoms
• D. 2 oxygen atoms and 1 hydrogen atom

Answer: (B)

A water molecule, represented as H2O, is composed of two hydrogen atoms and one oxygen atom. This molecular structure is fundamental to its properties and behavior in various chemical processes. The two hydrogen atoms are covalently bonded to the single oxygen atom, creating a bent shape that is critical for water’s unique characteristics, such as its high surface tension and its ability to act as a solvent for many substances.

The choice that states two hydrogen atoms and one oxygen atom captures this precise molecular composition, illustrating the correct understanding of how water is formed and the significance of each atom within the molecule. Understanding this structure is vital in fields ranging from chemistry to biology, as it lays the groundwork for studying water’s role in living organisms and its interaction with other compounds.