Molecular Shapes Quiz: AB3E, AB2E2, AB4E2
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary purpose of sulfur hexafluoride (SF6) in ultrasound imaging?

  • To absorb sound waves for better clarity
  • To create a barrier against background noise
  • To enhance the echogenicity of the blood (correct)
  • To increase the density of blood

    • What is the molecular shape of the complex formed when EDTA chelates a metal ion?

  • Tetrahedral
  • Linear
  • Octahedral (correct)
  • Trigonal planar

    • Which ion does EDTA specifically chelate?

  • Noble gases
  • Divalent transition metal ions (correct)
  • Monovalent cations
  • Trivalent cations

    • What role does water play when FeSO4 is dissolved in water?

    <p>It forms an octahedral complex with Fe2+ ions</p> Signup and view all the answers

    Which of the following best describes a common use of ethylenediaminetetraacetic acid (EDTA)?

    <p>As a chelating agent for heavy metals</p> Signup and view all the answers

    In ultrasound imaging, what is improved by the echogenicity of blood?

    <p>The signal to noise ratio</p> Signup and view all the answers

    What is the chemical representation of EDTA in its disodium form?

    <p>Na2EDTA</p> Signup and view all the answers

    Which metal ion is mentioned as an example of the one that EDTA can chelate?

    <p>Fe2+</p> Signup and view all the answers

    What form does sulfur hexafluoride take in ultrasound applications?

    <p>A contrast agent for enhancing imaging</p> Signup and view all the answers

    Which term describes the octahedral complex formed during the dissolution of FeSO4 in water?

    <p>Hydrated ion complex</p> Signup and view all the answers

    Which molecular shape best describes ammonia (NH3)?

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

    What is the molecular geometry of water (H2O)?

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

    Which of the following best describes the molecular shape of cisplatin, cis-PtCl2(NH3)2?

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

    What is the molecular shape of sulfur hexafluoride (SF6)?

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

    Which statement about the molecular shape AB4E2 is accurate?

    <p>It describes a square planar geometry.</p> Signup and view all the answers

    How many lone pairs of electrons are present in water (H2O)?

    <p>2</p> Signup and view all the answers

    In an octahedral molecular structure, how many atoms are typically bonded to the central atom?

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

    Which molecular shape does NOT correspond to the formula AB2E2?

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

    What is the common physical state characteristic of sulfur hexafluoride (SF6)?

    <p>It is colorless and odourless.</p> Signup and view all the answers

    What molecular shape would you expect for a molecule with the formula AB3E?

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

    What angle is predicted by VSEPR theory for methane (CH4)?

    <p>109.5°</p> Signup and view all the answers

    Which of the following correctly describes the repulsion order according to VSEPR theory?

    <p>Lone/lone pairs &gt; lone/bonding pairs &gt; bonding/bonding pairs</p> Signup and view all the answers

    What is the angle of the sulfite ion (SO32–)?

    <p>106°</p> Signup and view all the answers

    Which ion does Fe2+ predominantly interact with in the provided content?

    <p>Fe(H2O)6^2+</p> Signup and view all the answers

    How should a multiple bond be treated in VSEPR theory?

    <p>As though it were a single bond</p> Signup and view all the answers

    Which molecular geometry corresponds to the central atom configuration AB4?

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

    What is the actual bond angle for water (H2O) as stated?

    <p>104.5°</p> Signup and view all the answers

    In the VSEPR model, which of the following contributes most to bond angle distortion?

    <p>Lone pair repulsions</p> Signup and view all the answers

    Which statement about the bonding in methane is true?

    <p>It exhibits a tetrahedral structure with bond angles of 109.5°.</p> Signup and view all the answers

    For a molecule with the formula AB3E, what is the expected shape?

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

    Study Notes

    Molecular Shape – AB3E (Trigonal Pyramidal)

    • The molecule ammonia (NH3) has a trigonal pyramidal shape.
    • This shape is determined by the four electron pairs around the nitrogen atom.
    • The nitrogen atom has one lone pair and three bonding pairs.
    • The three hydrogen atoms are bonded to the nitrogen atom at an angle of about 107°.

    Molecular Shape – AB2E2 (Bent, Angular, V-shaped)

    • The molecule water (H2O) has a bent, angular, V-shaped shape.
    • The shape is determined by the four electron pairs around the oxygen atom.
    • The oxygen atom has two lone pairs and two bonding pairs.
    • The two hydrogen atoms are bonded to the oxygen atom at an angle of about 104.5°.

    Molecular Shape – AB4E2 (Square Planar)

    • The molecule cisplatin (cis-PtCl2(NH3)2) has a square planar shape.
    • The platinum atom has four bonding pairs and two lone pairs.
    • The platinum atom is bonded to two chlorine atoms and two ammonia molecules.
    • All four atoms are arranged in a square planar shape.

    Molecular Shape – AB6 (Octahedral)

    • The molecule sulfur hexafluoride (SF6) has an octahedral shape.
    • The central sulfur atom is bonded to six fluorine atoms.
    • The fluorine atoms are located at the corners of a regular octahedron.
    • SF6 is colorless, odorless, non-flammable, has a boiling point of –64°C and a density of 6.2 g/L.
    • SonoVue® is a liquid containing microbubbles of SF6 which are used with ultrasound imaging to enhance blood echogenicity.

    EDTA

    • EDTA (ethylenediaminetetraacetic acid) is a chelating agent.
    • EDTA forms an octahedral complex with divalent transition metal ions like Fe2+.
    • Disodium edetate (Na2EDTA) is used as an eye lubricant for dry eyes.

    VSEPR Theory

    • The Valence Shell Electron Pair Repulsion (VSEPR) theory describes the shapes of molecules.
    • The theory states that electron pairs around a central atom will arrange themselves as far apart as possible to minimize repulsive forces.
    • Lone pairs of electrons exert a greater repulsive force than bonding pairs.
    • The angles between bonding pairs in a molecule will be less than the theoretical angle due to lone pairs repelling the bonding pairs.
    • Treat a multiple bond as though it were a single bond.
    • The VSEPR theory helps predict the shapes of a wide variety of molecules.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Molecular Shape II PDF

    Description

    Test your understanding of molecular shapes with this quiz focused on the trigonal pyramidal, bent, and square planar configurations. Explore the structures of ammonia, water, and cisplatin, and learn how lone and bonding pairs influence molecular geometry. Perfect for chemistry students looking to solidify their knowledge of molecular shapes.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser