(Answered) 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

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

Please answer with explinations and anything else helpful that you can think of!!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 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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