Boiling Points
Part of the Structure and Bonding section of Coddy's Chemistry journey. Lesson 31 of 49.
Boiling separates molecules; it does not break the bonds inside them. Stronger forces between molecules mean a higher boiling point.
Similar size: London only (CH₄, -162 °C) < dipole-dipole (HCl, -85 °C) < hydrogen bonds (NH₃, -33 °C; H₂O, 100 °C).
Same kind of force: the bigger molecule boils higher (Cl₂ -34 °C, Br₂ 59 °C).
Challenge
Water boils at 100 °C but hydrogen sulfide, H₂S, boils at -60 °C. What is the strongest force between H₂S molecules?
Try it yourself
Shape viewerDescribe the molecule H2S
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Structure and Bonding
1Ionic Bonding
Why Atoms BondForming IonsThe Ionic BondIonic FormulasPolyatomic IonsIonic LatticesRecap - Salt Factory2Covalent Bonds
Sharing ElectronsCounting Valence ElectronsDrawing Lewis StructuresDouble and Triple BondsLone PairsFormal ChargeLewis Structures of IonsRecap - Molecule Builder5Forces Between Molecules
London ForcesDipole-Dipole ForcesHydrogen BondsBoiling PointsLike Dissolves LikeRecap - Boiling Contest