Molecular Shape and VSEPR Theory
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Questions and Answers

What is the bond angle in an H2O molecule?

  • 180°
  • 120°
  • 104.5° (correct)
  • 90°
  • Which molecular shape corresponds to an AB2E configuration?

  • Tetrahedral
  • Trigonal Planar
  • Linear
  • Angular, Bent (correct)
  • What does VSEPR stand for?

  • Valence Shell Electron Pair Repulsion (correct)
  • Valence Shell Energy Pair Repulsion
  • Valence Shell Electron Pair Regression
  • Valence Shell Electron Positioning Resonance
  • Identify the molecular shape of BF3.

    <p>Trigonal Planar</p> Signup and view all the answers

    Which molecular shape corresponds to an AB4 configuration?

    <p>Tetrahedral</p> Signup and view all the answers

    In which molecular shape do electron pairs distribute to minimize repulsion?

    <p>Tetrahedral</p> Signup and view all the answers

    What molecular shape does sulfur dioxide (SO2) exhibit?

    <p>Angular, Bent</p> Signup and view all the answers

    Which of the following statements about bond angles in a tetrahedral shape is correct?

    <p>Bond angles are influenced by lone pairs.</p> Signup and view all the answers

    What is the molecular shape classification of beryllium chloride (BeCl2)?

    <p>Linear</p> Signup and view all the answers

    Study Notes

    Molecular Shape

    • Bond angle: The angle between two bonds in a molecule (A-B-C)
    • Water (H2O) bond angle: 104.5 degrees
    • VSEPR Theory (Valence Shell Electron Pair Repulsion): Electron pairs around an atom repel each other and position themselves as far apart as possible.

    AB2 (Linear)

    • Examples: Beryllium Chloride (BeCl2) and Ethyne (C2H2)

    AB3 (Trigonal Planar)

    • Examples: Boron Trifluoride (BF3) and Tavaborole

    AB2E (Angular, Bent)

    • Example: Sulfur Dioxide (SO2)

    Trigonal Pyramid

    • A pyramid with a triangular base.

    AB4 (Tetrahedral)

    • Examples: Carbon compounds like Methane (CH4), all amino acids, and all proteins
    • Example: Drug molecules like L-Dopa and Adderall
    • R,L,S configurations (chiral centers), like C in the tetrahedral structure, have a chiral center with four different substituents.

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    Description

    Explore the different molecular shapes and their corresponding bond angles using VSEPR theory. This quiz covers linear, trigonal planar, angular, and tetrahedral molecules with examples like water, sulfur dioxide, and methane. Test your knowledge on how electron pairs affect molecular geometry.

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