Document Sample
Flame-Test-Experiment-New-Version Powered By Docstoc
					      Experiment Follow up:
      1. What are the two unknown ions?

      2. The electrons in what chemical produced the greatest energy change.
         Explain how you can tell.

      3. What causes, in reference to the electrons, the different colors for the
         different chemicals?

      4. For your two unknown substances, write the electron configuration (both
         shorthand and longhand) for the neutral atoms. How many valence
         electrons do they have?

      Use the table below to answer questions 5 – 12.

     Red               Orange         Yellow-orange         Green          Blue-green          Pink-lilac

lithium nitrate    calcium nitrate    sodium nitrate    barium nitrate    copper nitrate    potassium nitrate
     LiNO3            Ca(NO3)2           NaNO3            Ba(NO3)2          Cu(NO3)2             KNO3

lithium chloride   calcium chloride   sodium chloride   barium chloride   copper chloride      potassium
      LiCl               CaCl2             NaCl              BaCl2            CuSO4             chloride
lithium sulfate    calcium sulfate    sodium sulfate    barium sulfate    copper sulfate       potassium
     LiSO4             CaSO4             Na2SO4             BaSO4            CuSO4               sulfate
    lithium            calcium            sodium            barium         copper wire         potassium
       Li                 Ca                Na                Ba               Cu                  K

      5. Predict the color of the flame for the compound sodium hydroxide, NaOH.
         Explain your reasoning.

      6. Imagine you were in charge of creating a red and purple fireworks display.
         Name two combinations of compounds you could use.

      7. Does nitrate produce a colored flame? Explain your thinking.

      8. Would it matter whether you did a flame test with sodium chloride, NaCl,
         in solid form or sodium chloride as an aqueous solution? Explain.
9. What flame colors would be produced by these compounds? Explain your

      a. Na2CO3     b. Ba(OH)2       c. KOH     d. K2CO3     e. BaO

10. If two chemical samples both produce an orange flame upon testing, it is
    evidence that:
       A.    The two samples contain identical compounds.
       B.    The samples both contain chloride atoms.
       C.    The samples both contain calcium atoms.
       D.    The samples both contain potassium atoms.
       E.    The samples contain different compounds.

11. What evidence supports the claim that chloride, Cl-, does not cause the
    flame to have a color?
       A.     Lithium chloride, LiCl, and sodium chloride, NaCl, have
             different colors.
       B.    Ammonium chloride, NH4Cl, does not cause the flame to have a
       C.    Sodium chloride, NaCl, and sodium nitrate, NaNO3, both produce
             flames with a yellow-orange color.
       D.    All of the above.

Further Investigations:
Description of what other question(s) were raised during the experiment that
could be investigated with new experiments. Also a list of possible sources of
error and how the current experiment could be modified to eliminate or
minimize the sources of error that occurred during the experiment. Be

Shared By: