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4.2.1: Molecular Shape and Polarity (Problems)

  • Page ID
    235768
  • PROBLEM \(\PageIndex{1}\)

    Explain how a molecule that contains polar bonds can be nonpolar.

    Answer

    As long as the polar bonds are compensated (for example. two identical atoms are found directly across the central atom from one another), the molecule can be nonpolar.

    PROBLEM \(\PageIndex{2}\)

    Which of the following molecules and ions contain polar bonds? Which of these molecules and ions have dipole moments?

    a. ClF5
    b. \(\ce{ClO2-}\)

    c. \(\ce{TeCl4^2-}\)
    d. PCl3
    e. SeF4
    f. \(\ce{PH2-}\)

    g. XeF2

    Answer

    All of these molecules and ions contain polar bonds. Only ClF5, \(\ce{ClO2-}\), PCl3, SeF4, and \(\ce{PH2-}\) have dipole moments.

    PROBLEM \(\PageIndex{3}\)

    Which of the following molecules have dipole moments?

    a. CS2
    b. SeS2
    c. CCl2F2
    d. PCl3 (P is the central atom)
    e. ClNO (N is the central atom)

    Answer

    SeS2, CCl2F2, PCl3, and ClNO all have dipole moments.

    PROBLEM \(\PageIndex{4}\)

    The molecule XF3 has a dipole moment. Is X boron or phosphorus?

    Answer

    P

    PROBLEM \(\PageIndex{5}\)

    The molecule XCl2 has a dipole moment. Is X beryllium or sulfur?

    Answer

    S

    PROBLEM \(\PageIndex{6}\)

    Is the Cl2BBCl2 molecule polar or nonpolar?

    Answer

    nonpolar

     

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