9 1 worksheet _3_ by cuiliqing

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									G 10                            Chemistry worksheet(11)                                 sec9.1

                                       Bonding of Atoms



I- Multiple Choice

1. When electrons are shared unequally, chemists characterize these types of bonds as
   ______________.

   A.   polar covalent
   B.   unbalanced
   C.   ionic
   D.   pure covalent


2. Atoms with greatly differing electronegativity values are expected to form
   A. nonpolar covalent bonds
   B. no bonds
   C. ionic bonds
   D. polar covalent bonds


3. Metals typically have ______________ electronegativity values.
   A. high
   B. no
   C. negative
   D. low


4. Nonmetal elements typically have ______________ electronegativities.
   A. low
   B. neutral
   C. high
   D. strong


5. Carbon dioxide has ______________ bonds.
   A. ionic
   B. magnetic
   C. polar covalent
   D. covalent
6. Which of the following compounds contains an ionic bond?
   A. NaCl                          C.    CCl4
   B. O2                             D. SO2


7. The most electronegative element is _____

   A. Cs                                C. F
   B. He                                D. At


8. In the hydrogen chloride molecule, the atoms are held together by a(n)
   A. polar covalent bond
   B. double bond
   C. nonpolar bond
   D. ionic bond


9. If atom X forms a diatomic molecule with itself, the bond is
   A. ionic
   B. nonpolar covalent
   C. polar covalent
   D. polar coordinate covalent


10. One of the most important characteristics of the water molecule is its ______________,
    which allows it to surround and attract both positive and negative ions.
    A. fluidity                              C. stability
    B. strength                              D. polarity



11. A substance that has atoms held together by covalent bonds rather than ionic bonds is known
    as:

   A. Ionic compound                      C. Covalent compound
   B. Molecular substance                 D. Polar covalent compound



12. A bond formed between two atoms with an electronegativity difference of 0.7 is likely to be :

  A. Polar covalent bond

  B. Nonpolar covalent bond

  C. Ionic bond

  D. Covalent bond
II- Answer the following Questions

1. Tick each statement with the type of the bond that is related to it.

                                                                       Metallic     Covalent      Ionic
                                                                        Bond         Bond         Bond
 A material used in making electrical transmission wires

 A material used to make the insulation wrapped around
 transmission lines that lie on the ocean floor
 A material used as a lubricating oil
 A material that is dissolved in large quantities in sea water

 A material used to make high-temperature furnaces

 A material used in the manufacture of wires in suspension
 bridges
 A material used to make cans
 A material used as a gaseous propellant in spray cans, such as
 deodorant or shaving cream dispensers
 A material that evaporates readily at room temperature

 A material that is a good conductor when melted but a poor
 conductor when solid




2. The line in below represents the range of differences in electronegativity ∆EN that are
   possible between any two elements in the periodic table. The smallest difference is
   represented by the left end of the line, and the greatest difference by the right end of the line.
   In the space provided, write the letter of the labeled parts from this line that corresponds to the
   descriptions. Some of the letters may be used more than once.




     a.   The lowest possible value of ∆EN
     b.   The bond of greatest possible ionic character
     c.   A pure nonpolar covalent bond
     d.   A polar covalent bond
     e.   An ionic bond that would form between calcium and oxygen
     f.   The bond in a diatomic molecule of an element
     g.   A bond that is classified as nonpolar but that has a slight polarity
     h.   The division between nonpolar covalent and polar covalent bonds
3. Using EN to classify the bonds in the following compounds as covalent, polar covalent, or
   ionic.

   A)     H S bond in H2S
   B)     S O bond in SO2
   C)     Mg   Br bond in MgBr2
   D)     N O bond in NO2
   E)     C Cl bond in CCl4



4. Electronegativity is a periodic property.

   i)        Define electronegativity.

            _____________________________________________________________________

            _____________________________________________________________________

   ii)       Explain what happen to the electronegativity of the elements as you move down from
             the top to the bottom of the group.

             _____________________________________________________________________

             _____________________________________________________________________

   iii)      Explain the relationship between shielding effect and electronegativitly as you move
             down the group.

             _____________________________________________________________________

             _____________________________________________________________________

             _____________________________________________________________________



5. List three properties of Metals

            _____________________________________________________________________

            _____________________________________________________________________

            _____________________________________________________________________



6. Explain why metals are good conductors of electricity

            _____________________________________________________________________

            _____________________________________________________________________

								
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