Posting 01b - Continuation of Melting Point Lecture

Posting 01b - Continuation of Melting Point Lecture -...

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Copyright © 2016. Govindarajoo, G. Rutgers, The State University of New Jersey. All rights reserved. Continuation of Melting Point Lecture THIS POSTING WILL ONLY BE AVAILABLE UNTIL 9/26/16 Impure Compounds To explain the behavior of impure compounds, use melting point composition diagram. X will start melting and dissolve Y in it - making the melting range larger. Solution of X+Y has a lower vapor pressure than vapor pressure of pure X which results in a lower melting point. Difference between melting and dissolving: Melting: disrupting/breaking intermolecular forces within molecule Dissolving: disrupting attractive forces of two molecules and getting them to interact with each other. Terminology Eutectic Temperature - the lowest temperature at which a mixture at a certain concentration will start melting Eutetctic Point (2 definitions) Definition with regard to melting point composition diagram: - Lowest point on melting point composition diagram where a
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