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Department of Chemistry University of Missouri-St. Louis Practice Exam II Chem. 2633 1A. If the boiling temperature of 1,3-diphenylacetone is 330 C
University of Missouri-St. Louis
Practice Exam II
Chem. 2633
1A.
If the boiling temperature of
1,3-diphenylacetone is 330 ° C at 1 atm pressure, at what
approximate pressure would you expect it to boil at 280 ° C?
B.
Explain why if the atmospheric pressure above water drops below 4 mm of mercury, the
water eventually freezes and then disappears.
C.
In the synthesis of methyl salicylate, why was the organic layer washed with water?
D.
Suppose you were asked to dete
r
mine whether a liquid isolated from a site suspected of
arson was an accelerant. What you do to identify this material based on what you have learned
this semester.
E.
You take a melting point of your unknown and find that it melts some 10 ° C lower than
the value expected for the compound believed to be. What would you do?
F Would you do the same thing if the compound in E above melted 15 ° C higher? Why?
1
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