Chemistry Quiz: Molecular Geometry

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| By Catherine Halcomb
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Catherine Halcomb
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Chemistry Quiz: Molecular Geometry - Quiz

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Questions and Answers
  • 1. 

    Which of the following play an important role in the reactivity of molecule? 

    • A.

      The type of molecule 

    • B.

      The number of atom in the molecule 

    • C.

      The speed of the reaction 

    • D.

      The shape of the molecule 

    Correct Answer
    D. The shape of the molecule 
    Explanation
    The shape of a molecule plays an important role in its reactivity because it determines how the molecule can interact with other molecules. The shape affects the arrangement of atoms and the distribution of electron density, which in turn affects the molecule's ability to form and break chemical bonds. Different shapes can lead to different levels of stability and reactivity, as well as influence the types of reactions that a molecule can undergo. Therefore, the shape of a molecule is a crucial factor in determining its reactivity.

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  • 2. 

    One of these molecules have 3 lone pairs bonded? 

    • A.

      NH3

    • B.

      NaCl

    • C.

      H2O

    • D.

      BaCl2

    Correct Answer
    A. NH3
    Explanation
    NH3 is the correct answer because it is the only molecule in the given options that has 3 lone pairs bonded. In NH3, the central nitrogen atom is bonded to three hydrogen atoms, leaving one lone pair of electrons. This makes NH3 a trigonal pyramidal molecule with 3 lone pairs bonded. NaCl is an ionic compound and does not have any lone pairs. H2O has 2 lone pairs bonded, and BaCl2 has no lone pairs bonded.

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  • 3. 

    Every molecules have 3 atoms have a same reactivity? 

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    Not all molecules have three atoms with the same reactivity. The reactivity of atoms in a molecule depends on various factors such as their electronic configuration, bonding, and the presence of functional groups. Different atoms within a molecule can have different reactivities based on these factors. Therefore, the statement that every molecule with three atoms has the same reactivity is incorrect.

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  • 4. 

    Of the following species , ___________ will have bond angles of 120?

    • A.

      PH3

    • B.

      ClF3

    • C.

      NCl3

    • D.

      BCl3 

    • E.

      All of these following will have a bond angles of 120 

    Correct Answer
    D. BCl3 
    Explanation
    BCl3 will have bond angles of 120. This is because BCl3 has a trigonal planar molecular geometry, where the central boron atom is surrounded by three chlorine atoms. The three chlorine atoms are arranged symmetrically around the boron atom, creating a bond angle of 120 degrees between them.

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  • 5. 

    In H2O, what is the electron domain geometry? And what is the angle ?

    • A.

      Tetrahedral , 120 

    • B.

      Linear , 180 

    • C.

      Bent , 108.5

    • D.

      Tetrahedral , 109.5 

    Correct Answer
    D. Tetrahedral , 109.5 
    Explanation
    The correct answer is "tetrahedral, 109.5". In H2O, the electron domain geometry is tetrahedral because there are four electron domains around the central oxygen atom. The angle is 109.5 degrees because the two bonding pairs and two lone pairs of electrons repel each other, causing the molecule to adopt a tetrahedral shape with a bond angle of 109.5 degrees.

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  • 6. 

    The electron domain geometry of ___________ is tetrahedral.

    • A.

      CBr4

    • B.

      PH3

    • C.

      CCl2Br2

    • D.

      XeF4

    • E.

      All of the above except XeF4 

    Correct Answer
    E. All of the above except XeF4 
    Explanation
    The electron domain geometry of CBr4, PH3, and CCl2Br2 is tetrahedral. This means that the central atom in each of these molecules is surrounded by four electron domains, resulting in a tetrahedral arrangement. However, XeF4 does not have a tetrahedral electron domain geometry. XeF4 has a square planar electron domain geometry, where the central xenon atom is surrounded by four electron domains arranged in a flat square shape. Therefore, the correct answer is all of the above except XeF4.

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  • 7. 

    The molecular geometry of the NO2*-1:

    • A.

      Trigonal planar 

    • B.

      Linear

    • C.

      Tetrahedral 

    • D.

      Bent 

    Correct Answer
    D. Bent 
    Explanation
    The correct answer is "bent". This is because the NO2^-1 molecule has a central nitrogen atom bonded to two oxygen atoms. The electron arrangement around the nitrogen atom is trigonal planar, but due to the lone pair of electrons on the nitrogen atom, the molecule adopts a bent shape. This lone pair causes electron-electron repulsion, pushing the oxygen atoms closer together and resulting in a bent molecular geometry.

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  • 8. 

    Which of the following is polar:

    • A.

      NO2

    • B.

      CCl4

    • C.

      BF3

    • D.

      BCl3

    Correct Answer
    A. NO2
    Explanation
    NO2 is polar because it has a bent molecular geometry and a lone pair of electrons on the central nitrogen atom. This lone pair creates an imbalance in the distribution of electrons, resulting in a polar molecule.

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  • 9. 

    The _______ is the arrangement of only the atoms in a molecule?  

    • A.

      Electron domain geometry 

    • B.

      Molecular geometry

    • C.

      None of the above

    • D.

      All of the above 

    • E.

      None of the above

    Correct Answer
    B. Molecular geometry
    Explanation
    Molecular geometry refers to the arrangement of only the atoms in a molecule. It describes the spatial arrangement of the atoms in a molecule, including the bond lengths and bond angles. Electron domain geometry, on the other hand, refers to the arrangement of both the atoms and lone pairs of electrons around a central atom. Therefore, the correct answer is molecular geometry.

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  • 10. 

    One of the following is polar:

    • A.

      BF3

    • B.

      CCl4

    • C.

      CH3Cl

    • D.

      None

    Correct Answer
    C. CH3Cl
    Explanation
    CH3Cl is a polar molecule because it has a dipole moment. The chlorine atom is more electronegative than the carbon and hydrogen atoms, causing the electron density to be shifted towards the chlorine atom. This creates a partial negative charge on the chlorine atom and partial positive charges on the carbon and hydrogen atoms. As a result, CH3Cl has an uneven distribution of charge and is considered polar. BF3 and CCl4 are nonpolar molecules because they have symmetrical structures and no dipole moment.

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  • 11. 

    In O=C=O is the O=C polar? 

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    The molecule O=C=O, also known as carbon dioxide, is polar. This is because the oxygen atoms on either side of the carbon atom have a higher electronegativity than carbon, causing an unequal sharing of electrons. As a result, the oxygen atoms pull the electrons towards themselves, creating partial negative charges on the oxygen atoms and a partial positive charge on the carbon atom. This separation of charges makes O=C=O a polar molecule.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 07, 2021
    Quiz Created by
    Catherine Halcomb
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