Chem 251 Final Exam Worksheet - 2005 Page 3
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92. (30 pts: 6 @ 5 pts each): Answer ONLY 6 of the following:
a) Explain why BF
is a weaker Lewis acid than BCl
?
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b) Suggest an explanation for the fact that the mobilities of the alkaline metal ions in aqueous
+
+
+
+
+
solution follow the sequence: Li
< Na
< K
< Rb
< Cs
.
c) Briefly discuss the extraction of aluminum from its ores (for full credit, chemical reactions must be
included in your answer).
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