Final answer:
A single water molecule can form up to four hydrogen bonds due to its bent shape and the presence of two hydrogen atoms per molecule.
Step-by-step explanation:
A single water molecule can form up to four hydrogen bonds. A hydrogen bond in water occurs between the hydrogen atom of one water molecule and the lone pair of electrons on the oxygen atom of a neighboring water molecule. Due to the bent shape of water and the presence of two hydrogen atoms per molecule, multiple hydrogen bonds can occur simultaneously.