Why Water Is Bent: The Shapes of Molecules | General Chemistry 1.8

Water weighs 18 g per mole and boils at 100 °C; carbon dioxide weighs 44 and is a gas far below zero. This episode draws both with Lewis structures, works through the octet and its exceptions, resonance in ozone and nitrate, and formal charge, then lets electron domains push apart into the VSEPR shapes. A bent water molecule keeps its bond dipoles and a straight carbon dioxide cancels them, which is why one sticks to its neighbors and the other drifts away. Chapters 0:00 Water and carbon dioxide on a scale 0:23 The lighter one boils higher 0:40 Bent and straight 1:29 Lewis and the cubic atom 1:54 The octet rule 2:10 Drawing a Lewis structure: water 2:51 Carbon dioxide and double bonds 3:26 Three ways to break the octet 4:19 Ozone: two equal drawings 5:11 Resonance 5:45 Nitrate 6:04 Formal charge 6:49 What Lewis structures can't show 7:26 Lewis's tetrahedron 8:00 Electron domains repel 8:23 The VSEPR shapes 9:15 Lone pairs squeeze the angle 10:00 Why lone pairs push harder 10:28 Carbon dioxide straight, water bent 10:57 Bond dipoles add or cancel 11:58 Polar molecules stick together 12:24 Three things to keep 12:56 Next episode: the oxygen puzzle Reference: Steven S. Zumdahl and Susan A. Zumdahl, *Chemistry*, 7th ed, sections 8.9-8.13. Historical sources: Lewis, J. Am. Chem. Soc. 38, 762 (1916): https://doi.org/10.1021/ja02261a002 · Langmuir, J. Am. Chem. Soc. 41, 868 (1919): https://doi.org/10.1021/ja02227a002 · Lewis, Valence and the Structure of Atoms and Molecules (1923): https://archive.org/download/valences... · Oregon State University, Pauling and the Nature of the Chemical Bond, resonance: https://scarc.library.oregonstate.edu... · Sidgwick and Powell, Proc. R. Soc. A 176, 153 (1940): https://doi.org/10.1098/rspa.1940.0084 · NIST CCCBDB, experimental geometry of water: https://cccbdb.nist.gov/expgeom2x.asp... Previous episode: 1.7 "Ionic or Covalent". Next episode: 1.9 "Why Oxygen Is Magnetic". Narration: AI voice (ElevenLabs); music: AI-generated (Lyria) and original synthesized tracks.