Question

Describe the molecular structure of water, and explain why it is a polar molecule. paragrap[h

Answer 1

Water (H2O) is a bent (V-shaped) molecule in which an oxygen atom sits at the apex and two hydrogen atoms occupy the ends of the V. The oxygen has two lone pairs and two O–H bonding pairs, giving an approximate tetrahedral electron-pair geometry (sp3 hybridization) but a molecular shape of about 104.5° for the H–O–H bond angle (O–H bond length ≈ 0.96 Å). Oxygen is much more electronegative than hydrogen, so each O–H bond is polar: the shared electrons are pulled closer to oxygen, creating a partial negative charge on O and partial positive charges on the H atoms. Because the molecule is bent rather than linear, the two bond dipoles do not cancel; their vector sum produces a net dipole moment (≈1.85 D) pointing toward the oxygen. This unequal charge distribution is why water is a polar molecule, which underlies its strong hydrogen bonding and many of its unique physical properties.