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CSU CHEM 111 - Molecular Polarity

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Review: Valence Shell Electron Pair Repulsion Theory (VSEPR)VSEPR TheoryA model predicting that the arrangement of valence electron pairs around a central atom minimizes repulsion to produce the lowest energy orientationElectron Pair Geometry3-dimensional arrangement of bonding e- pairs and lone pairs electrons about a central atomMolecular Geometry3-dimensional arrangement of atoms in a moleculeVSEPR: Electron Pair GeometryTo determine electron pair geometry:Draw Lewis Structure (see Chapter 8)From Lewis Structure, determine steric number (SN):SN= (number of atoms bonded to central atom) + (number of lone pairs on central atom)Determine optimal spatial arrangement of electron pairs (bonding + nonbonding) to minimize repulsionSN= (number of atoms bonded to central atom ) + (number of lone pairs on central atom)Molecular Geometry: Central Atom with No Lone PairsMolecular Geometry = electron pair geometryDetermine Steric Number (SN):Molecular Geometry: Central Atom with No Lone PairsMolecular Geometry = electron pair geometryDetermine Steric Number (SN):SN = 2 (two atoms bonded to central atom)Geometry = linearSN = 3 (three atoms bonded to central atom)Geometry = trigonal planarSN = 4  tetrahedralSN = 5  trigonal bipyramidalSN = 6  octahedralGeometric FormsWhat determines whether a triatomic molecule is polar or non-polar?The number of dipoles and the direction of the dipolesWhat is the relationship between bond dipoles and the molecular dipole?The bond dipoles are added together to get the molecular dipoles.Problem Solving PathwayChemical Name  Chemical Formula  Lewis Dot Structure Molecular geometry  Molecular polarity  Properties & ReactivityPolar Bonds and Polar MoleculesMeasuring PolarityDipole Moment (mu): a quantitative expression of the polarity of a moleculeCHEM 111 1nd Edition Lecture 18 Outline of Last Lecture I. ReviewII. Resonance III. Lewis Structure Exceptions to the Octet RuleOutline of Current Lecture II. ReviewIII. VSEPRIV. Molecular GeometryCurrent Lecture Review: Valence Shell Electron Pair Repulsion Theory (VSEPR)- VSEPR Theoryo A model predicting that the arrangement of valence electron pairs around a central atom minimizes repulsion to produce the lowest energy orientation- Electron Pair Geometryo 3-dimensional arrangement of bonding e- pairs and lone pairs electrons about a central atom- Molecular Geometryo 3-dimensional arrangement of atoms in a molecule VSEPR: Electron Pair Geometry- To determine electron pair geometry:o Draw Lewis Structure (see Chapter 8)o From Lewis Structure, determine steric number (SN):o SN= (number of atoms bonded to central atom) + (number of lone pairs on central atom)o Determine optimal spatial arrangement of electron pairs (bonding + nonbonding) to minimize repulsion SN= (number of atoms bonded to central atom ) + (number of lone pairs on central atom)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Molecular Geometry: Central Atom with No Lone Pairs- Molecular Geometry = electron pair geometry- Determine Steric Number (SN): Molecular Geometry: Central Atom with No Lone Pairs- Molecular Geometry = electron pair geometry- Determine Steric Number (SN):o SN = 2 (two atoms bonded to central atom) Geometry = linearo SN = 3 (three atoms bonded to central atom) Geometry = trigonal planaro SN = 4  tetrahedralo SN = 5  trigonal bipyramidalo SN = 6  octahedralGeometric FormsWhat determines whether a triatomic molecule is polar or non-polar?The number of dipoles and the direction of the dipolesWhat is the relationship between bond dipoles and the molecular dipole?The bond dipoles are added together to get the molecular dipoles. Problem Solving PathwayChemical Name  Chemical Formula  Lewis Dot Structure Molecular geometry  Molecular polarity  Properties & Reactivity Polar Bonds and Polar Molecules Measuring Polarity Dipole Moment (mu): a quantitative expression of the polarity of a


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CSU CHEM 111 - Molecular Polarity

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