14 TECH0701: Meaburing the Melring Points of Compounds and Mists (0 what occurre

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14 TECH0701: Meaburing the Melring Points of Compounds and Mists (0 what occurred when crystals began to disappear from the bottom of the capillary tube rather than turning to a liquid. 2. A sample has an experimental melting point of 100-101 C. Can you conclude that the sample is pure? Briefly explain your reasoning 3. Using Figure 1, explain in detail the melting point behavior of a mixture composed of 60 mass percent X and 40 mass percent Y. 4. An unknown compound melted at 131-133 "C. It is thought to be one of the following compounds (mp, ): trans cinnamic acid (133-134); benzamide (128-130); DL.malic acid (131-133); or benzoin (135-137). The mixture melting points of the unknown compound with each of the test compounds are listed below. What is the unknown compound? Briefly explain your reasoning Unknown plus trans-cinnamic acid benzamide DI-malic acid benzoin mp range r'C) 110-120 130-132 114-124 108-116 5. Using your textbook or another appropriate resource, find the structural formula for benzoic acid and mandelic acid. Draw the structural formulas of these compounds.

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14 TECH0701: Meaburing the Melring Points of Compounds and Mists (0 what occurre

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