4.5 Practice Problems

Attempt these problems as if they were real exam questions in an exam environment.

Only look up information if you get severely stuck. Never look at the solution until you have exhausted all efforts to solve the problem. Having to look up information or the solution should be an indicator that the previous layers (1–5) in the Structured Learning Approach have not been mastered.

  1. Name the compound with the formula: P4O10

    1. tetraphosphorus decoxide
    2. phosphorus(IV) oxide
    3. phosphorus oxide
    4. phosphorus decoxide
    5. quadraphosphorus nonoxide

    Solution


  2. What is the molecular geometry of CO32–?

    1. tetrahedral
    2. bent
    3. T-shaped
    4. trigonal bipyramidal
    5. trigonal planar

    Solution


  3. Choose the species that contains at least one bond angle smaller than 120 °.

    1. BF3
    2. XeF2
    3. CO2
    4. H2S
    5. NO3–

    Solution


  4. Which of the following is not hypervalent?
        SF2     XeF2     IF2     SF4     SF6

    1. XeF2 and SF2 only
    2. XeF2, SF2, IF5, and SF4 only
    3. XeF2 only
    4. SF2 only
    5. They all follow the octect rule and thus cannot be hypervalent.

    Solution


  5. Draw the Lewis structure for NO2–. Which statement is not true?

    1. There are double bonds between nitrogen and each of the two terminal oxygen atoms.
    2. It is an odd-electron molecule.
    3. There are two or more lone pairs on each of the two terminal oxygen atoms.
    4. Nitrogen is the central atom.
    5. Ther are two resonance Lewis structures.

    Solution


  6. Which of the following are not polar but contain polar bonds?
        CCl4
        CO2
        CH2Cl2
        H2S
        SO2

    1. CO2, H2S, and SO2 only
    2. CO2 only
    3. CCl4 and CO2 only
    4. CCl4 and CH2Cl2 only
    5. all of them

    Solution


  7. What is the electron domain geometry and the molecular geometry, respectively, for H2O?

    1. tetrahedral, bent
    2. tetrahedral, trigonal pyramidal
    3. linear, linear
    4. linear, bent
    5. tetrahedral, tetrahedral

    Solution


  8. Which option correctly ranks typical strengths of the various electrostatic interactions?

    1. ionic bond > dispersion > dipole-dipole > hydrogen bond
    2. dispersion> dipole-dipole > hydrogen bond > ionic bond
    3. dipole-dipole > hydrogen bond > dispersion > ionic bond
    4. ionic bond > hydrogen bond > dipole-dipole > disperson
    5. hydrogen bond > ionic bond > dipole-dipole > dispersion

    Solution


  9. Which molecule contains carbon with a negative formal charge?
         CO     CO2     CO32–     CH2O     CH4

    1. CO only
    2. CO and CO32–
    3. CO, CO32–, and CH2O
    4. CO32– only
    5. none of them

    Solution


  10. Which of the following compounds has the lowest melting point?

    1. MgO
    2. Na2O
    3. H2O
    4. CH3Cl
    5. CH4

    Solution


  11. What are the bond angles in PO43– in degrees?

    1. 90
    2. slightly smaller than 90
    3. 120
    4. 109.5
    5. slightly smaller than 109.5

    Solution


  12. Which bond is the strongest and which is the longest?
        C–O     C=O     C≡O

    1. single bond, triple bond
    2. triple bond, single bond
    3. single bond, single bond
    4. double bond, triple bond
    5. double bond, single bond

    Solution


  13. Which name is correct for CoF3?

    1. Cobalt trifluoride
    2. Cobalt(III) fluoride
    3. Cobalt fluoride
    4. Chromium fluoride
    5. Chromium(III) fluoride

    Solution


  14. Consider the best Lewis structures for the following molecules. Which of these molecules have resonance?
        CO32–     ClO–     NO3–     PH3

    1. CO32– and NO3–
    2. PH3 and ClO–
    3. CO32– and PH3
    4. ClO– and NO3–
    5. none of these

    Solution




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