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							  #39 The melting point of a compound is 1240 degrees C. Is this
  Compound most likely an ionic or molecular compound?


Answer: IONIC; It has a very HIGH melting point
that is characteristic
Of ionic compounds. Think of Table salt as an example. It
Melts at very high temperatures.

Molecular compounds are easy to melt. Think of butter for
Example.
#40 Identify the number and kinds of atoms present in a
Molecule of each compound:

a. C6H8O6    Has 6 carbons, 8 hydrogen's, and 6 oxygen's.


B. C12H22O11 Has twelve carbons, twenty two hydrogens, and
Eleven oxygens


C. C7H5N3O6 has seven carbons, five hydrogens, three nitrogens
And six oxygens
41. Which of the following gases in Earth’s atmosphere
Would you expect to find as molecules and which as
Individual atoms? Explain.



 a. Nitrogen Nitrogen would be found as N2 with a triple
 Covalent bond.

b. Oxygen Oxygen would be founds a O2 with a double
Covalent bond.

 c. Argon Argon never bonds with anything including itself
 So you would expect it to be individual atoms.
#42 Explain why neon is monatomic but chlorine is diatomic.


  Neon is monatomic (means one atom) because it is a noble gas
  And doesn’t bond with anything.



  Chlorine is diatomic (meaning two atoms) Cl2 because
  Each chlorine needs one electron to fill its outer valence shell
  It does so by sharing one electron with another chlorine.
 #43 Classify the following compounds as ionic or covalent
Non-polar (totally equal sharing)                 Ionic (total
                                                  Transfer)
 #43 Classify the following compounds as ionic or covalent
Non-polar (totally equal sharing)                 Ionic (total
                                                  Transfer)
#44 Describe the difference between an ionic and a covalent bond?
#45 How many electrons do two atoms in a double bond
Covalent bond share? How many in a triple covalent bond?


                                        Double bond
                                        Shares four




    triple bond
    Shares six
#46 Write plausible electron dot structures for the following
Substances. Each substance contains only single covalent bonds.


    I2                        OF2




   H2S                              NI3
      #47 Characterize a coordinate covalent bond and
      Give an example:

        A coordinate covalent bond occurs when one atom
        Supplies both of the electrons in the bond. In this example
        Nitrogen supplies both electrons to the hydrogen that comes
        in to bond.




In this example fluorine
Brings in both electrons
To bond with Boron.
#48 Explain why compounds containing C – N and
C – O single bonds can form coordinate covalent bonds
With H+ but compounds containing only C – H and
C – C single bonds cannot.



                             In the case of C – N bonds and
                             C – O bonds, an unshared pair
                             Of electrons can exist to allow
                             Another atom to bond without
                             Bringing in two of its own.
                             C – H and C – C bonds don’t
                             Usually have unshared pairs to
                             Bond with.
#49 Using electron dot structures, draw at least two
Resonance structures for the nitrite ion (NO21-)