Final answer:
The claim that hydrogen molecules share a single covalent bond with oxygen in a water molecule is false. A water molecule consists of two hydrogen atoms, each forming a separate covalent bond with the central oxygen atom.
Step-by-step explanation:
The statement that hydrogen molecules share a single covalent bond with oxygen in a water molecule is false. In reality, each hydrogen atom forms a separate covalent bond with the oxygen atom, resulting in two covalent bonds within a water molecule.
In a water molecule, noted as H2O, the two hydrogen atoms are bonded to a central oxygen atom via polar covalent O-H bonds. These polar covalent bonds are created when the shared electrons comprising an O-H bond spend more time around the more electronegative oxygen atom.