Questions and Answers
What is the molecular geometry of SF4?
seesaw
What is the molecular geometry of ClF3?
T-shape
What is the molecular geometry of [IF2]-?
linear
What is the molecular geometry of [IBr4]-?
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What is the molecular geometry of BrF5?
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What is the molecular geometry of SCl6?
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What is the molecular geometry of PF5?
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What is the molecular geometry of [IF4]+?
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What is the molecular geometry of C2H2?
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What is the molecular geometry of C2H4?
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What is the molecular geometry of C2H6?
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What is the approximate bond angle for a molecule with a trigonal planar shape?
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What is the approximate bond angle for a molecule with a tetrahedral shape?
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What is the electron geometry (eg) and molecular geometry (mg) of BCl3?
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What is the electron geometry (eg) and molecular geometry (mg) of CO32⁻?
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What is the electron geometry (eg) and molecular geometry (mg) of CH3+1?
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What is the electron geometry (eg) and molecular geometry (mg) of SiF4?
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What is the electron geometry (eg) and molecular geometry (mg) of PF5?
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What is the electron geometry (eg) and molecular geometry (mg) of BrF3?
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What is the electron geometry (eg) and molecular geometry (mg) of ICl2⁻?
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What is the electron geometry (eg) and molecular geometry (mg) of XeF2?
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What is the electron geometry (eg) and molecular geometry (mg) of XeF4?
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What is the molecular geometry at C1 and C2 in a given molecule?
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What are the molecular geometries at the labeled atoms in a given molecule?
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Order the following in increasing X-Se-X bond angle: SeO2, SeCl6, SeF2.
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Order the following in increasing F-A-F bond angle: PF3, OF2, PF4⁺.
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Order the following in decreasing X-A-X bond angle: N2O, NCl3, NO2⁻.
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Order the following in decreasing X-A-X bond angle: CS2, CF4, SCl2.
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Study Notes
Molecular Geometries
- SF4: Seesaw geometry; important for predicting molecular interactions.
- ClF3: T-shaped structure; notable for unique electron pair arrangements.
- IF2⁻: Linear geometry; indicates symmetrical distribution of electron density.
- IBr4⁻: Square planar; emphasizes the significance of d-orbitals in heavy elements.
- BrF5: Square pyramidal shape; shows how lone pairs affect molecular orientation.
- SCl6: Octahedral geometry; associated with expanded octets in heavier elements.
- PF5: Trigonal bipyramidal configuration; key to understanding varying bond angles.
Electron Geometry and Molecular Geometry
- BCl3: Both electron and molecular geometry are trigonal planar, emphasizing symmetry.
- CO3²⁻: Known for its trigonal planar arrangement, critical for resonance structures.
- CH3⁺: Exhibits trigonal planar geometry; important for electron-deficient species.
- SiF4: Displays tetrahedral geometry; foundational for understanding hybridization.
Bond Angles
- Trigonal Planar Shape: Approximate bond angle of 120°; significant in predicting molecular behavior.
- Tetrahedral Shape: Approximate bond angle of 109.5°; crucial in molecular formation.
Comparison of Geometries
- PF5: Both electron and molecular geometries are trigonal bipyramidal, which allows more efficient bonding.
- BrF3: Electron geometry is trigonal bipyramidal, molecular geometry is T-shaped; emphasizes lone pair influence.
- ICl2⁻: Linear geometry in a trigonal bipyramidal environment; highlights symmetry in charged species.
- XeF2: Linear structure with a trigonal bipyramidal electron geometry; indicates effective electron pair repulsion.
Molecular Structures
- C2H2 (HCCH): Linear configuration; explains simple alkyne structures.
- C2H4 (H2CCH2): Trigonal planar around the carbon atoms; key for understanding alkenes.
- C2H6 (H3CCH3): Tetrahedral geometry around interior carbons; typical of saturated hydrocarbons.
Bond Angle Comparisons
- Increasing X-Se-X Bond Angle: Sequence is SeCl6 < SeF2 < SeO2; reflects influence of different substituents on bond angles.
- F-A-F Bond Angle Order: OF2 < PF3 < PF4⁺ demonstrates how lone pairs perturb bond angles.
- Decreasing X-A-X Bond Angle: Sequence is N2O > NO2⁻ > NCl3; shows the effects of lone pairs and multiple bonds.
Practical Application
- Recognizing molecular geometries aids in predicting reactivity and properties of compounds.
- Understanding bond angles helps in visualizing molecular interactions and sterics.
- Geometry and structure data inform synthesis and design of new chemical compounds.
Studying That Suits You
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Description
Explore the molecular geometries for various molecules and ions through flashcards based on Chapter 10 of Tro's Chemistry textbook. This quiz focuses on determining shapes like seesaw and T-shape, as well as sketching the molecular structures using specific bond conventions.
