Ch 3: Molecular shape
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Questions and Answers

What is the main role of the shape of molecules according to the text?

  • Causing chemical reactions in molecules
  • Determining the color of molecules
  • Dictating their interactions and physical properties (correct)
  • Influencing the smell of molecules

    • Why do water molecules have unique properties?

  • Due to their linear shape
  • Because of their specific polarity (correct)
  • Having a symmetrical structure
  • Being arranged randomly

    • What does Valence Shell Electron Pair Repulsion (VSEPR) Theory predict?

  • The period of an element
  • Molecular shapes based on electron pairs positioning (correct)
  • The color of a substance
  • The molecular weight of a compound

    • In the context of VSEPR Theory, what is the role of the central atom?

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

    What type of electron pairs influence a molecule's geometry based on VSEPR Theory?

    <p>Non-bonding pairs</p> Signup and view all the answers

    How should electron pairs arrange themselves according to VSEPR Theory?

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

    What molecular shape does CO2 have?

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

    Which molecule has a trigonal planar molecular shape?

    <p>BF3</p> Signup and view all the answers

    What leads to deviations from ideal molecular shapes?

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

    In which molecule does one lone pair cause a slight distortion from tetrahedral geometry?

    <p>NH3</p> Signup and view all the answers

    How many electron pairs occupy the corners of a tetrahedron in CH4?

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

    Which molecule does not exhibit a linear molecular shape?

    <p>CH4</p> Signup and view all the answers

    What does the Valence Shell Electron Pair Repulsion (VSEPR) Theory aim to predict?

    <p>Molecular shapes based on electron pair arrangement</p> Signup and view all the answers

    Why is the shape of water molecules unique according to the text?

    <p>As a result of their specific shape and polarity</p> Signup and view all the answers

    In VSEPR Theory, why do electron pairs position themselves as far apart as possible?

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

    What is the primary role of the central atom in determining a molecule's shape?

    <p>To dictate the geometry by influencing surrounding atoms</p> Signup and view all the answers

    How should electron pairs around a central atom arrange themselves, according to VSEPR Theory?

    <p>As far apart as possible</p> Signup and view all the answers

    What is a critical factor in determining a molecule's shape using VSEPR Theory?

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

    What is the molecular shape of NH3?

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

    Which molecule has a trigonal bipyramidal molecular shape?

    <p>PCl5</p> Signup and view all the answers

    Why does H2O have a bent shape?

    <p>As a result of the presence of lone pairs</p> Signup and view all the answers

    Which molecule has a linear molecular shape?

    <p>O2</p> Signup and view all the answers

    In VSEPR Theory, what causes deviations from ideal molecular shapes?

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

    What is the molecular shape of BF3?

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

    Which molecule has a trigonal pyramidal molecular shape?

    <p>NH3</p> Signup and view all the answers

    What is the molecular shape of SF6?

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

    What is the molecular shape of CO2?

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

    Why does the presence of lone pairs lead to deviations from ideal molecular shapes?

    <p>Creates repulsion between atoms</p> Signup and view all the answers

    Which molecule has a trigonal bipyramidal molecular shape?

    <p>PCl5</p> Signup and view all the answers

    In VSEPR Theory, what causes the deviation from ideal molecular shapes?

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

    Why is the shape of molecules significant?

    <p>It dictates the interactions, reactions, and physical properties of the molecule</p> Signup and view all the answers

    What concept does Valence Shell Electron Pair Repulsion (VSEPR) Theory use to predict molecular shapes?

    <p>Electron pair minimization to reduce repulsion</p> Signup and view all the answers

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

    <p>It acts as a reference point for arranging other atoms</p> Signup and view all the answers

    How does Valence Shell Electron Pair Repulsion (VSEPR) Theory explain molecular shapes?

    <p>By minimizing electron repulsion</p> Signup and view all the answers

    What does the VSEPR Theory account for when predicting molecular shapes?

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

    Why would altering the shape of water molecules by making them linear affect their behavior?

    <p>It would increase their polarity</p> Signup and view all the answers

    Which molecule's shape deviates due to the presence of one lone pair?

    <p>H2O</p> Signup and view all the answers

    What is the molecular shape of a molecule like PCl5?

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

    In which molecule do three electron pairs form a flat, triangular shape?

    <p>BF3</p> Signup and view all the answers

    What is the molecular shape of a linear molecule like O2?

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

    Which molecule has an ideal tetrahedral molecular shape with no lone pairs?

    <p>CH4</p> Signup and view all the answers

    Which type of molecular geometry is exhibited by molecules with the absence of lone pairs?

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

    What is the primary purpose of the Valence Shell Electron Pair Repulsion (VSEPR) theory?

    <p>To predict the molecular shape based on electron pair arrangement</p> Signup and view all the answers

    Why do water molecules exhibit unique properties according to the text?

    <p>Based on the presence of lone electron pairs in the molecule</p> Signup and view all the answers

    In VSEPR Theory, what happens to minimize repulsion among electron pairs?

    <p>The electron pairs position themselves as far apart as possible</p> Signup and view all the answers

    What would be the consequence if a molecule's bonding pairs were not arranged as far apart as possible?

    <p>The molecule's shape would deviate from ideal geometry</p> Signup and view all the answers

    How does VSEPR Theory account for the shape of molecules with lone electron pairs?

    <p>By assuming lone pairs will position themselves as far apart as possible</p> Signup and view all the answers

    Which factor plays a crucial role in determining a molecule's shape based on VSEPR Theory?

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

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