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?

  • AXâ‚„
  • AXâ‚‚
  • 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 (C)</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 (C)</p> Signup and view all the answers

What is the shape of the BF₃ molecule?

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

What is the general formula for a linear molecule?

<p>AXâ‚‚ (A)</p> Signup and view all the answers

What does VSEPR theory predict?

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

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

<p>Determine Basic Geometry (C)</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 (B)</p> Signup and view all the answers

What is the shape of the NH₃ molecule?

<p>Trigonal Pyramidal (D)</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 (A)</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 (B)</p> Signup and view all the answers

What is the first step to predict the molecular shape?

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

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

<p>Boiling point (C)</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 (B)</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 (D)</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 (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>AXâ‚… (C)</p> Signup and view all the answers

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

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

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

<p>Tetrahedral (C)</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 (B)</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 (B)</p> Signup and view all the answers

What does the Lewis diagram of a molecule show?

<p>The valence electrons around the central atom (C)</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 (A)</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 (B)</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 (A)</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 (C)</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 (B)</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 (C)</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 (D)</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 (A)</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 (C)</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 (A)</p> Signup and view all the answers

Which of the following molecules has a trigonal bipyramidal shape?

<p>AXâ‚… (D)</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 (A)</p> Signup and view all the answers

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

<p>Octahedral (B)</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 (B)</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 (B)</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 (C)</p> Signup and view all the answers

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