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
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
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
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.
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