Question

water molecules are formed by ________. polar covalent bonds nonpolar covalent bonds ionic bonds hydrogen bonds

Explanation:

Water molecules ($H_2O$) are composed of two hydrogen atoms and one oxygen atom. Oxygen is more electronegative than hydrogen. In the formation of a water - molecule, the electrons in the covalent bonds are not shared equally between oxygen and hydrogen, creating a polar covalent bond. Non - polar covalent bonds occur when electrons are shared equally (not the case in $H_2O$). Ionic bonds involve the transfer of electrons between atoms, which doesn't happen in $H_2O$ formation. Hydrogen bonds are intermolecular forces between water molecules, not the bonds that form the water molecule itself.

Answer:

polar covalent bonds