CHM233 Prelab - 1....

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1.   What is the name of this piece of laboratory equipment?    Student Response Value Feedback A.  Adapter, Distilling   B.  Adapter, Thermometer, 10/18 100%    C.  Adapter, Bent, 105°, 14/20   D.  Clamp for 14/20 Joint   Score: 0.5/0.5    2.   What is the name of this piece of glassware?    Score: 0.5/0.5    3.   If a water-acetic acid solution with a mole fraction water of 0.68 were cooled at what temperature would  crystals start to form?   
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  Score: 0.5/0.5    4.   If a water-acetic acid solution with a mole fraction water of 0.68 is cooled what is the composition of the first  crystals that form?    Score: 0.5/0.5    5.   If a solid water-acetic acid mixture with a mole fraction water of 0.20 is heated what is the composition of  the last solid to melt?    Score: 0.5/0.5    6.  
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If a solid water-acetic acid mixture with a mole fraction water of 0.20 is heated at what temperature would  melting be complete?    Score: 0.5/0.5    7.   If a solid water-acetic acid mixture with a mole fraction water of 0.90 were heated at what temperature  would it start to melt?    Score: 0.5/0.5    8.   Two of these bottles contain 4-aminobenzamide and one 3,5-dinitrobenzamide.  A mixed melting point of 1 and 2 melts at 175-180° A mixed melting point of 1 and 3 melts at 175-180° A mixed melting point of 2 and 3 melts at 182-183°  Which bottle, 1, 2, or 3, contains 3,5-dinitrobenzamide? 
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  Score: 0.5/0.5    9.   In order to collect accurate melting point data, a student taking a melting point reading should increase the temperature slowly as the melting point temperature is approached. What is/are the reason(s) for this?   Score: 0.5/0.5    10.   The melting point of pure benzoic acid is 121-123° C. A student recovers a sample of benzoic acid, and then packs a capillary tube to a height of 5 mm. The measured melting point was 123°-125° C. What immediate action should the student take?  
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  Score: 0.5/0.5    Title: Quiz 2 AB1 TLC Started: June 28, 2009 12:20 PM Submitted: June 28, 2009 12:22 PM Time spent: 00:01:34  Total score: 5/5 = 100%   Total score adjusted by 0.0  Maximum possible score: 5  1.   One can affect the distance a spot travels on a TLC plate by changing the. ..    Score: 0.5/0.5    2.   The distance a compound moves on a TLC plate is an indication of. ..   
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  Score: 0.5/0.5    3.   Ethyl acetate is a solvent that contains a(n) ____________ functional group.    Score: 0.5/0.5    4.  
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This note was uploaded on 10/07/2010 for the course CHEM 233 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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CHM233 Prelab - 1....

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