Molecular Geometry Practice
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Questions and Answers

What is the full name of the theory used to determine the shape of a molecule?

  • Vibrational Shell Electron Path Recognition Theory
  • Valence Shell Electron Pair Repulsion Theory (correct)
  • Variable Shape Electron Pair Resolution Theory
  • Valence Structure Electromagnetic Polarization Theory

    • How can you determine the first digit of the VSEPR number for a molecule?

  • By adding the number of single and double bonds around the central atom
  • By counting the number of atoms bonded to the central atom (correct)
  • By calculating the total number of electrons in the molecule
  • By counting the number of lone pairs on the central atom

    • A double bond accounts for how many electron domains?

  • Four
  • Three
  • One (correct)
  • Two

    • What molecular geometry corresponds to a VSEPR number of 3 2 1?

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

    According to VSEPR theory, molecules adopt a shape that will reduce what between the bonded electrons?

    <p>Electrostatic repulsion</p> Signup and view all the answers

    What shape does a molecule with 3 electron domains around the central atom adopt?

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

    How many electron domains does a double bond account for in VSEPR terminology?

    <p>1</p> Signup and view all the answers

    What is the VSEPR number for tetrahedral molecular geometry?

    <p>4</p> Signup and view all the answers

    What is the VSEPR number for a molecule with a trigonal planar molecular geometry?

    <p>3 3 0</p> Signup and view all the answers

    How many electrons domains does a triple bond account for?

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

    What is the main purpose of the VSEPR theory?

    <p>To predict bond angles</p> Signup and view all the answers

    How many total numbers are in a VSEPR code?

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

    What molecular geometry corresponds to the VSEPR number 6 5 1?

    <p>Square pyramidal</p> Signup and view all the answers

    What information does the third digit of the VSEPR number provide?

    <p>Number of lone pairs</p> Signup and view all the answers

    Why is the bond angle in a bent geometry less than that of a trigonal planar geometry?

    <p>Lone pairs exert more repulsion than bonding pairs.</p> Signup and view all the answers

    What is the first VSEPR number for square planar molecular geometry?

    <p>6</p> Signup and view all the answers

    How many molecular geometries are possible for a molecule with 3 atoms and/or lone pairs around a central atom?

    <p>3</p> Signup and view all the answers

    What Molecular Geometry corresponds to the VSEPR number 4 2 2?

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

    What is the molecular geometry for the VSEPR number 5 3 2?

    <p>T-shaped</p> Signup and view all the answers

    What information does the third digit of the VSEPR number provide?

    <p>Number of lone pairs</p> Signup and view all the answers

    What electron geometry corresponds to having 4 electron domains around a central atom?

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

    How many bonding domains does a triple bond account for?

    <p>One bonding domain.</p> Signup and view all the answers

    What is the molecular geometry associated with the VSEPR number 5 4 1?

    <p>Seesaw.</p> Signup and view all the answers

    Define the VSEPR number for square planar molecular geometry.

    <p>The VSEPR number for square planar geometry is 6 4 2.</p> Signup and view all the answers

    Identify the molecular geometry for a VSEPR number of 3 1 2.

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

    What does the second digit in the VSEPR number indicate?

    <p>The number of bonded atoms</p> Signup and view all the answers

    What is the molecular geometry corresponding to the VSEPR number 5 3 2?

    <p>T-shaped.</p> Signup and view all the answers

    How many molecular geometries can a molecule with 6 electron domains exhibit?

    <p>3</p> Signup and view all the answers

    What is the VSEPR number for trigonal pyramidal molecular geometry?

    <p>The VSEPR number for trigonal pyramidal geometry is 431.</p> Signup and view all the answers

    What electron geometry results from a VSEPR number of 5 4 1?

    <p>The molecular geometry is trigonal bipyramidal.</p> Signup and view all the answers

    Describe how lone pairs affect molecular geometry compared to bonding pairs.

    <p>Lone pairs occupy more space than bonding pairs and can alter bond angles, affecting the overall molecular shape.</p> Signup and view all the answers

    For a VSEPR number of 5 5 0, what is the molecular geometry?

    <p>The molecular geometry is trigonal bipyramid.</p> Signup and view all the answers

    How many molecular geometries can exist for a central atom with two electron domains?

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

    What is the role of VSEPR theory in predicting molecular shape?

    <p>VSEPR theory predicts molecular shape by considering the repulsion between electron domains around the central atom.</p> Signup and view all the answers

    What is the VSEPR number for a molecule with T-shaped geometry?

    <p>The VSEPR number for T-shaped geometry is 532</p> Signup and view all the answers

    What is the molecular geometry when the VSEPR number is 5 4 1?

    <p>The molecular geometry is see saw.</p> Signup and view all the answers

    How many molecular geometries are there for a molecule with 3 atoms and/or lone pairs around a central atom?

    <p>There are 3 possible molecular geometries.</p> Signup and view all the answers

    For a VSEPR number of 6 4 2, what is the molecular shape and what factors contribute to this geometry?

    <p>The molecular shape is square planar, primarily due to the presence of 4 bonding pairs and 2 lone pairs.</p> Signup and view all the answers

    What is the relationship between the number of electron domains and molecular geometry?

    <p>The number of electron domains determines the arrangement of atoms in a molecule, influencing its geometry.</p> Signup and view all the answers

    What does the second digit of the VSEPR number indicate regarding the bonding and non-bonding pairs?

    <p>The second digit represents the number of bonded atoms around the central atom.</p> Signup and view all the answers

    How can you predict the molecular geometry of a molecule with a VSEPR number of 4 4 0?

    <p>The molecular geometry is tetrahedral, as there are 4 bonding pairs and no lone pairs.</p> Signup and view all the answers

    What is the significance of bond angles in determining the geometry of molecules?

    <p>Bond angles are critical as they reflect the spatial arrangement of atoms and contribute to the overall shape.</p> Signup and view all the answers

    If a molecule exhibits T-shaped geometry, what might its VSEPR number be?

    <p>The VSEPR number would be 5 3 2, indicating 3 bonding pairs and 2 lone pairs.</p> Signup and view all the answers

    What is meant by an electron domain in the context of VSEPR theory?

    <p>An electron domain refers to a region of space where electrons are likely to be found, including bonds and lone pairs.</p> Signup and view all the answers

    What is the molecular geometry for a molecule with VSEPR number 6 4 2?

    <p>The molecular geometry is square planar</p> Signup and view all the answers

    How many electron domains does a double bond count as in the context of VSEPR theory?

    <p>A double bond counts as one electron domain.</p> Signup and view all the answers

    What is the VSEPR number corresponding to a square planar molecular geometry?

    <p>The VSEPR number is 6 4 2.</p> Signup and view all the answers

    What is the significance of the third digit in the VSEPR number?

    <p>The third digit indicates the number of lone pairs around the central atom.</p> Signup and view all the answers

    How many molecular geometries can exist for a central atom with six bonding or lone pairs?

    <p>There are three possible molecular geometries.</p> Signup and view all the answers

    What is the molecular geometry for a VSEPR number of 5 5 0?

    <p>The molecular geometry is trigonal bipyramidal.</p> Signup and view all the answers

    Study Notes

    Molecular Geometry and Polarity

    • Valence Shell Electron Pair Repulsion Theory (VSEPR) is used to predict molecular shapes.

    • VSEPR theory assumes electron pairs (bonding and lone pairs) arrange themselves as far apart as possible to minimize repulsion.

    • A VSEPR number is a three-digit code that describes the geometry of a molecule. The first digit represents the total number of electron domains around the central atom. The second digit represents the number of bonding domains around the central atom. The third digit represents the number of lone pairs around the central atom.

    • The first digit of the VSEPR number represents the total electron domains.

    • A double bond counts as one electron domain.

    • A lone pair counts as one electron domain.

    • Six electron domains around a central atom result in an octahedral shape.

    • A lone pair occupies more space than a bonding domain.

    • The third digit of the VSEPR number indicates the number of lone pairs.

    • Molecular geometries can be determined if the first two digits of the VSEPR number are known.

    • Trigonal planar geometry has a VSEPR number of 3 3 0.

    • Seesaw molecular geometry has a VSEPR number of 5 2 1

    • T-shaped molecular geometry has a VSEPR number of 5 3 0.

    • The molecular geometry for VSEPR number 6 6 0 is octahedral.

    • The molecular geometry for VSEPR number 3 2 1 is trigonal pyramidal.

    • The molecular geometry for VSEPR number 5 5 0 is trigonal bipyramidal.

    • There are two molecular geometries for a molecule with two atoms/lone pairs around the central atom.

    • There are five molecular geometries for a molecule with four atoms/lone pairs around the central atom.

    • There are nine molecular geometries for a molecule with five atoms/lone pairs around the central atom.

    • There are 14 molecular geometries for a molecule with six atoms/lone pairs around the central atom.

    • The bond angle in a bent geometry is less than the bond angle in a trigonal planar geometry due to repulsion from lone pairs.

    • How many electron domains does a triple bond account for? A triple bond counts as one electron domain.

    • How many bonding domains does a double bond account for? A double bond counts as one bonding domain.

    • How many bonding domains does a triple bond account for? A triple bond counts as one bonding domain.

    • VSEPR number 4 2 2 corresponds to bent molecular geometry.

    • VSEPR number 6 5 1 corresponds to square pyramidal molecular geometry.

    Homework Questions

    • VSEPR (Valance Shell Electron Pair Repulsion) theory reduces repulsion between bonded electrons.
    • A VSEPR code has three numbers.
    • An electron domain is a region around a central atom where electrons are likely to be found.
    • The number of electron domains can be calculated by adding the number of bonding pairs and lone pairs of electrons around the central atom.

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    Description

    Test your understanding of Molecular Geometry with these practice questions. Covering VSEPR theory, electron domains, and molecular shapes, this quiz will challenge your knowledge on the arrangement of electrons around central atoms. Get ready to delve into the fascinating world of molecular structures!

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