CHE K121 Lecture Notes - Lecture 20: Lattice Energy, Bond Length, Ionic Bonding
Document Summary
Lattice energy: born-haber cycle: uses hess"s law to calculate lattice energy, heat of fusion + heat of vaporization = heat of sublimation. Covalent bond: covalent bond of hydrogen, equal sharing of electrons. "2: unequal sharing of the bond because cl is more electronegative than h making this bond a polar covalent bond, generally a di erence in electronegativity of 2. 0 or greater = ionic bonding. 4. (optional) if the molecule is a cation, subtract an electron for each (+) charge; if the molecule is a anion, add an electron for each (-) charge. "3: distribute the non-bonding electron in pairs so each atom gets an octet (except for h, which only needs a duet) 6. (optional): if necessary, shift electron pairs to create double or triple bonds. Monday, november 12, 2018: note: for bond length (single > double > triple, resonance structures are not real, the structures are not interconverting, the actual structure is a hybrid of all three.
