Chapter 10 notes - Chapter 10 Shapes of Molecules Lecture...

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Slide No. 1 Chapter 10: Shapes of Molecules What's The Point ? We learn how atomic orbitals combine to give molecules their observed structure. Lewis Dot Structures Drawing Lewis Dot Structures of Molecular Compounds Resonance Formal Charge Estimating Bond Enthalpies from Bond Energies VSEPR Molecule Polarity Reading: Entire Chapter Homework Problems: 5(6), 9(10a),11(12a), 13(14a), 15(16b), 17(18), 19(20a,b), 21(22b), 26(24), 30(31), 43(44), 45(46), 49(50a,b,d), 51(52), 64(65) Lecture Outline Slide No. 2 10.1 Lewis Dot Structures of Molecules Gilbert N. Lewis, American chemist (1875-1946) Lewis Structures Predict atom connectivity and bond order in molecules Predict three-dimensional molecular structure 1) Determine total number of VEs in each atom (ns and np orbitals only). Add electrons for anions, subtract for cations. 2) Draw a molecular structure with single bonds between atoms H is always terminal (it can only form 1 bond) Least electronegative atom is usually the central atom and is often the first atom in the chemical formula (SO 2 , ClO 4 ) Each single bond that you drew uses up 2 (shared) electrons 3) Determine # of remaining VEs (subtract 2 x bonds from total) 4) Fill in the octets around the terminal atoms (except H) and again calculate the number of VEs remaining 5) Place remaining electrons around central atom Lewis in 1923 Guidelines for Lewis Diagrams
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