chem 233 melting points 2011 SPRING revised2

chem 233 melting points 2011 SPRING revised2 - 4/27/11 Who:...

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4/27/11 1 Who: Undergraduate and Graduate students in the Department of Chemistry When: Monday Jan. 24 th to Sunday Feb. 6 th Why: Improve the Chemistry Department and be eligible to win one of several $350 gi± cerK²cates to Best Buy Where: Undergraduates illinois.edu/ O /sec/6629039 Graduates illinois.edu/ O /sec/1293868 Announcements I will be unavailable for Office Hours next week Please contact me by email • To arrange alternate times to meet • To answer by email questions you may have
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4/27/11 2 Melting points Physical properties Physical properties can be determined by observing the sample. No destruction of the sample will occur. Melting point Boiling point Viscosity Odor Length Conductivity Physical properties can identify a compound, but one physical property is not enough
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4/27/11 3 What are melting points? Melting points are a physical property of a substance, but alone are not enough to identify to substance Melting point = the temperature at which a phase change from solid to liquid occurs At the melting point, both liquid and solid exist in equilibrium Important points about MP • Pure compounds will melt over a narrow temperature range~ 1 ºC • Impure compounds will melt over a lower, wider temperature range • Melting points are an indicator of purity because impurities
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This note was uploaded on 04/27/2011 for the course CHEM 233 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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chem 233 melting points 2011 SPRING revised2 - 4/27/11 Who:...

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