Chapter 11 Quiz

Chem 20                                        D. Oliver

Select the best answers for the questions below and then click "submit" to send your answers. Only the first submission will be counted.

  1. The shape of an PH3 molecule is _____________ ______________. Note you need to carefully read the VSEPR section, draw the Lewis structure and deduce the sahpe of the molecule based on the number of atoms bonded to the central atom and the number of unbonded electron pairs. Spelling will count! (No excuses.)

    2. Your answer:

  2. The shpae of the H2Se molecule is ________________. Spelling will count! (No excuses.)

    3. Your answer:

  3. The shape of the BCl3 molecule is _______________ ____________. Spelling will count! (No excuses.)

    4. Your answer:

  4. The shape of the NH4+ ion is _______________. Spelling will count! (No excuses.)

    5. Your answer:

  5. The bond angle between atoms in SiCl4 is ______ degrees. Enter the angle to the nearest tenth of a degree.

    6. Your answer:

  6. The bond angle for CH4 is 90°.

    7. Your answer:
    True False

  7. A bond between K and O is polar.

    8. Your answer:
    True False

  8. A bond between H and P is ionic.

    9. Your answer:
    True False

  9. The individual C=O bonds in CO2 are non-polar.

    10. Your answer:
    True False

  10. Resonance exists for the molecule NO.

    11. Your answer:
    True False

  11. When covalent bonds form, _______________________________.

    12. Your answer:
    electrons are transferred and the system is of lower energy.
    electrons are transferred and the system is of higher energy.
    electrons are shared, and the energy of the system is higher.
    the oppositely charged ions attract.
    electrons are shared, and the energy of the system is lower.

  12. The Lewis structure for (CH3)2CO contains_____________________.

    13. Your answer:
    6 single bonds, one double bond, and two unpaired electrons.
    6 single bonds, two double bond, and three unbonded pairs of electrons.
    6 single bonds, one double bond, and three pairs of unbonded electrons.
    8 single bonds, one double bond, and two pairs of unbonded electrons.
    8 single bonds, one triple bond, and one of unbonded electrons.

  13. When calcium and sulfur react,_______________________.

    14. Your answer:
    The electron configuration of the ions formed is the same.
    A pair of electrons is shared in a nonpolar covalent bond.
    Two electrons are shared in the ionic bond.
    A pair of electrons is transferred from the sulfur to the calcium.
    A pair of electrons is shared in a polar covalent bond.

  14. To remove the first, second and third electrons from Be requires 900, 1757 and 14,845 kJ/mole respectively. Why is the third ionization energy so much larger than the first or second?

    15. Your answer:
    Ionization energy generally increases up and to the right on the periodic table.
    Removing the first two electrons is easier because the electrons are further from the necleus.
    Atoms that have a noble gas configuration are generally larger than expected.
    The Be2+ ion is much smaller than the Be atom or the Be+1 ion, and inner shell electrons are being removed.
    Because the atomic radius decreases up and to the right on the periodic table.

  15. For the atoms and ions, Mg+2, Na+, Ne, F- and O-2, _________________.

    16. Your answer:
    the different number of electrons controls the relative sizes of these ions.
    all have the same electron configuration and increase in size from left to right.
    all have the same number of protons after the ions form.
    have the same number of electrons and are therefore the same size.
    all have the same electron configuration and increase in size from right to left.

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