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Questions and Answers
What does VSEPR stand for?
What does VSEPR stand for?
Valence-Shell Electron Pair Repulsion
What is the electron-pair geometry when the steric number (SN) is 2?
What is the electron-pair geometry when the steric number (SN) is 2?
Linear
Which molecular geometry corresponds to a steric number (SN) of 4?
Which molecular geometry corresponds to a steric number (SN) of 4?
The molecular geometry is the same as the electron-pair geometry when lone pairs are present on the central atom.
The molecular geometry is the same as the electron-pair geometry when lone pairs are present on the central atom.
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What type of molecular geometry is formed with a steric number of 3 and one lone pair?
What type of molecular geometry is formed with a steric number of 3 and one lone pair?
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What is the bond angle in a trigonal planar molecular geometry?
What is the bond angle in a trigonal planar molecular geometry?
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Which hybridization is associated with a linear electron-pair geometry?
Which hybridization is associated with a linear electron-pair geometry?
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The bond angles in molecules with lone pairs are typically ______ than the theoretical angles.
The bond angles in molecules with lone pairs are typically ______ than the theoretical angles.
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Study Notes
Valence-Shell Electron Pair Repulsion Theory (VSEPR)
- A model that predicts the arrangement of electron pairs around a central atom to minimize repulsions and achieve the lowest energy configuration.
- Electron Pair Geometry: describes the three-dimensional arrangement of bonding pairs and lone pairs around a central atom.
- Molecular Geometry: describes the three-dimensional arrangement of atoms in a molecule.
- If there are no lone pairs, Electron-Pair Geometry = Molecular Geometry.
Key Points About VSEPR
- Steric Number (SN): The sum of atoms bonded to a central atom and lone pairs on that atom.
- SN determines Electron-Pair Geometry:
- 2 = Linear
- 3 = Trigonal Planar
- 4 = Tetrahedral
- 5 = Trigonal Bipyramidal
- 6 = Octahedral
Difference Between Electron-Pair and Molecular Geometry
- When lone pairs are present, Molecular Geometry differs from Electron-Pair Geometry.
- Molecular Geometry is based on the positions of bonded atoms.
Bond Angles
- Defined by the angle between two atoms bonded to a third.
- Electron-pair geometry provides theoretical bond angles.
- Actual bond angles vary due to VSEPR effects:
- Lone pair-bonding pair repulsion is greater than bonding pair-bonding pair repulsion.
- Lone pair repulsion is greater than double bond repulsion.
- Double bond repulsion is greater than single bond repulsion.
- Two lone pairs on a central atom exert greater repulsion than one lone pair.
SN = 2 (Linear)
- Electron Pair Geometry: Linear
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Bonded Atoms: 2
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Lone Pairs: 0
- Molecular Geometry: Linear
- Bond Angles: 180°
- Example: CO2
- Hybridization: sp
SN = 3 (Trigonal Planar)
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Electron Pair Geometry: Trigonal Planar
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Bonded Atoms: 3
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Lone Pairs: 0
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Molecular Geometry: Trigonal Planar
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Bond Angles: 120°
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Example: CH2O
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Hybridization: sp2
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Electron Pair Geometry: Trigonal Planar
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Bonded Atoms: 2
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Lone Pairs: 1
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Molecular Geometry: Bent
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Bond Angles: Less than 120°
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Example: SO2
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Hybridization: sp2
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Description
Test your understanding of Valence-Shell Electron Pair Repulsion (VSEPR) Theory. This quiz covers key concepts like electron pair geometry, molecular geometry, and the impact of steric numbers on molecular shapes. Dive in to see how well you grasp the arrangements of atoms in various molecules!
