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Structural Formula quiz

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Terms in this set (15)

  • What information does a structural formula provide that a molecular formula does not?
    A structural formula shows how atoms are connected and their spatial arrangement, while a molecular formula only shows the types and numbers of atoms.
  • What is meant by the term 'expanded formula' in organic chemistry?
    Expanded formula refers to a structural formula where every single bond between atoms is shown explicitly.
  • How many bonds does a neutral carbon atom typically form, and what is this property called?
    A neutral carbon atom forms four bonds, a property called tetravalency.
  • What is the main difference between a structural formula and a condensed formula?
    A structural formula shows all bonds explicitly, while a condensed formula groups atoms together and omits individual bond lines.
  • In a condensed formula, how is a CH3 group represented?
    A CH3 group is shown as a carbon bonded to three hydrogens, typically written as CH3.
  • What is a skeletal formula, and how are carbons and hydrogens depicted in it?
    A skeletal formula omits carbons and hydrogens bonded to carbons, showing only the bonds and other atoms like heteroatoms.
  • What is another name for the skeletal formula in organic chemistry?
    The skeletal formula is also called the Kekule structure.
  • In a skeletal formula, what does each end and corner represent?
    Each end and corner in a skeletal formula represents a carbon atom.
  • Why are hydrogens connected to carbons not shown in skeletal formulas?
    Hydrogens connected to carbons are not shown because they are assumed based on carbon's tetravalency.
  • When must hydrogens be shown in a skeletal formula?
    Hydrogens must be shown when they are attached to atoms other than carbon, such as oxygen or nitrogen.
  • How do you determine the number of hydrogens on a carbon in a skeletal formula?
    Count the number of bonds the carbon makes; the remaining bonds up to four are filled by hydrogens.
  • What is the significance of carbon being tetravalent in structural formulas?
    Tetravalency ensures that each carbon forms four bonds, which helps deduce the number of hydrogens or other atoms attached.
  • What is the ball-and-stick model used for in chemistry?
    The ball-and-stick model is used to visually represent the three-dimensional structure of molecules.
  • What are the three predominant ways to represent organic molecules in structural formulas?
    Organic molecules can be represented as structural (expanded), condensed, or skeletal formulas.
  • How can you use structural formulas to determine the molecular formula of a compound?
    By counting all atoms shown and implied in the structural formula, you can derive the molecular formula.