whmc (1) - E XPE RI M E N T : Name _ Billy _ Instructor...

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E XP E R I M E N T : " W H O H AS M Y C O M P O U N D ? " Name _______________________________________ Instructor ____________________________________ Chem ____________ Section/Color ______________ Date ________________________________________ Laboratory Questions Revised 8/07 These questions are to be completed and turned in with the Laboratory Report. P O S T -L A B Q U E S T I O NS 1. The contamination of a pure organic with an impurity affects the observed melting point only if the impurity dissolves to some extent in the liquid phase of the organic compound. Therefore, small granules of sand or broken glass (sand and glass have similar compositions and melt only at very high temperatures) will not reduce the melting point of a pure organic compound with which they might be mixed. In a sample containing small grains of sand, what would you ob s e rv in the Mel-Temp apparatus when you melt the sample that would indicate to you that your sample contained an impurity? (How would the melted sample look different than the melted sample of
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This note was uploaded on 07/17/2011 for the course CHEM 237 taught by Professor Yu-chinli during the Spring '07 term at Texas A&M.

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