Quiz 2 - Name: _ TA: _ Lab Color: _ ID: D Chem 237 - Quiz...

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Name: ________________________ TA: ___________________ Lab Color: __________ ID: D Page 1 of 2 Chem 237 - Quiz #2 - Spring 2011 Identify the choice that best completes the statement or answers the question. (27 points; 3 points each) ____ 1. A broad and depressed melting point range usually indicates that _____? a. the compound contains some impurities b. the compound is pure c. the compound melts at eutectic point d. I can’t tell anything from melting point ____ 2. What is the R f value for the compound on the TLC plate shown? a. 2 b. 0.8 c. 0.4 d. 0.5 ____ 3. Which one is the CORRECT statement about melting point determination? a. Only one measurement is enough. b. Use the same heating rate all the time. c. One makes at least two measurements to determine the melting point. d. Load as little sample into the capillary as one can. ____ 4. What compound (in a 10% aqueous solution) was used to test solubility of the unknown? a.
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This note was uploaded on 03/08/2011 for the course CHEM 237 taught by Professor Yu-chinli during the Spring '07 term at Texas A&M.

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Quiz 2 - Name: _ TA: _ Lab Color: _ ID: D Chem 237 - Quiz...

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