Gr 11 Physical Sciences: Ch 3.2 Molecular shape
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Questions and Answers

What is the general formula for a trigonal planar molecule?

  • AX₄
  • AX₂
  • AX₃ (correct)
  • AX

    • What is the name of the theory used to determine the molecular shape?

  • Lewis theory
  • VSEPR theory (correct)
  • Electron theory
  • Valence theory

    • What is the geometry of a molecule with 2 bonding pairs and 2 lone pairs?

  • Bent or Angular (correct)
  • Trigonal Planar
  • Linear
  • Trigonal Pyramidal

    • What is the primary factor that determines the shape of a molecule?

    <p>The repulsion among electron pairs</p> Signup and view all the answers

    What is the purpose of drawing a Lewis diagram when determining molecular shape?

    <p>To show all valence electrons around the central atom</p> Signup and view all the answers

    What is the shape of the BF₃ molecule?

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

    What is the general formula for a linear molecule?

    <p>AX₂</p> Signup and view all the answers

    What does VSEPR theory predict?

    <p>The shape of a molecule</p> Signup and view all the answers

    What is the step to determine the basic geometry of a molecule?

    <p>Determine Basic Geometry</p> Signup and view all the answers

    What is the importance of molecular shape?

    <p>It influences properties such as boiling point and melting point</p> Signup and view all the answers

    What is the shape of the NH₃ molecule?

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

    What is the correct order of steps when determining molecular shape using VSEPR theory?

    <p>Draw the Lewis diagram, count electron pairs, determine geometry</p> Signup and view all the answers

    What type of electron pairs does VSEPR theory consider when determining molecular shape?

    <p>Both bonding and lone pairs of electrons</p> Signup and view all the answers

    What is the first step to predict the molecular shape?

    <p>Draw the Lewis Diagram</p> Signup and view all the answers

    Which of the following properties is influenced by the molecular shape of a molecule?

    <p>Boiling point</p> Signup and view all the answers

    What is the main reason behind the arrangement of valence electron pairs around a central atom in a molecule?

    <p>To minimize repulsion</p> Signup and view all the answers

    What is the purpose of counting electron pairs in the VSEPR theory?

    <p>To determine the molecular shape</p> Signup and view all the answers

    Which of the following is NOT a step in determining molecular shape using VSEPR theory?

    <p>Determining the molecular mass</p> Signup and view all the answers

    What is the role of the central atom in determining the molecular shape of a molecule?

    <p>It determines the arrangement of electron pairs</p> Signup and view all the answers

    Which of the following statements is TRUE about the VSEPR theory?

    <p>It considers both bonding and non-bonding electron pairs</p> Signup and view all the answers

    What is the general formula for a molecule with a trigonal bipyramidal shape?

    <p>AX₅</p> Signup and view all the answers

    What does the central atom represent in a 3D visualization of a molecule?

    <p>A red ball</p> Signup and view all the answers

    What is the geometry of a molecule with 4 bonding pairs and 0 lone pairs?

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

    What is the purpose of counting electron pairs in determining the molecular shape?

    <p>To identify the molecular shape</p> Signup and view all the answers

    What is the shape of a molecule with 1 or 2 bonding pairs and 0 lone pairs?

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

    What does the Lewis diagram of a molecule show?

    <p>The valence electrons around the central atom</p> Signup and view all the answers

    What is the geometry of a molecule with 3 bonding pairs and 1 lone pair?

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

    What is represented by a green ball in a 3D visualization of a molecule?

    <p>A lone pair</p> Signup and view all the answers

    What is the primary reason for the arrangement of valence electron pairs around a central atom in a molecule?

    <p>To minimize electron pair repulsion</p> Signup and view all the answers

    Which of the following is a consequence of the molecular shape of a molecule?

    <p>Influencing the reactivity of the molecule</p> Signup and view all the answers

    What is the relationship between the number of electron pairs and the basic geometry of a molecule?

    <p>The number of electron pairs determines the basic geometry of a molecule</p> Signup and view all the answers

    Why is drawing a Lewis diagram essential in determining molecular shape?

    <p>To show the arrangement of electron pairs around the central atom</p> Signup and view all the answers

    What is the significance of lone pairs in determining molecular shape?

    <p>Lone pairs have a stronger effect on molecular shape than bonding pairs</p> Signup and view all the answers

    Why is the molecular shape of a molecule crucial for its function?

    <p>It determines the reactivity of the molecule</p> Signup and view all the answers

    What is the molecular shape of a molecule with 2 bonding pairs and 1 lone pair?

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

    What is the purpose of drawing a Lewis diagram in determining molecular shape?

    <p>To show the arrangement of valence electrons around the central atom</p> Signup and view all the answers

    Which of the following molecules has a trigonal bipyramidal shape?

    <p>AX₅</p> Signup and view all the answers

    What is the correct order of steps when determining molecular shape using VSEPR theory?

    <p>Draw the Lewis diagram, count electron pairs, determine basic geometry, write the final answer</p> Signup and view all the answers

    What is the shape of a molecule with 6 bonding pairs and 0 lone pairs?

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

    What is the function of the central atom in a 3D visualization of a molecule?

    <p>To represent the central atom itself</p> Signup and view all the answers

    What is the main factor that determines the basic geometry of a molecule?

    <p>Total number of electron pairs</p> Signup and view all the answers

    What is the shape of a molecule with 3 bonding pairs and 0 lone pairs?

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

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