unit8_97603_99403

unit8_97603_99403 - Molecular structure and covalent...

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Molecular structure and covalent bonding Chapter 8
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Key concepts Understand the difference between Lewis structures and molecular geometries. Know the basic shapes of several molecule types. Know how to predict molecular shapes using valence- shell electron repulsion (VSEPR) model. Understand how overall molecular shape can affect the dipole moment of the molecule. Understand the use of valence-bond theory as an explanation for the VSEPR model. Know different hybrid orbitals that function in molecular geometries.
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Molecular geometries Lewis structures help us understand the type of bonds between atoms in a molecule But, they do NOT indicate the geometry in 3-D space. VSEPR theory helps describe the actual geometry of molecules based on their covalent bonding.
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two main parameters to know for molecular geometry: bond length(s) – bond angle(s) – (there is a third parameter, the dihedral angle, important in molecules with more than one central atom, which we will occasionally encounter) Molecular geometries
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Fundamental geometry five fundamental geometries behind all AB n molecular shapes Linear Trigonal planar Tetrahedral Trigonal bipyramidal Octahedral Table 8.1 (p. 305) illustrates fundamental geometries
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valence-shell electron repulsion (VSEPR) model used to predict geometries of AB
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unit8_97603_99403 - Molecular structure and covalent...

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