CHM142 experiment1 - SchoolofChEChm RottenCarbonoids...

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Romero, Von Joby M. Experiment No. 1:  Melting Point and Boiling Point of  Organic Compounds ABSTRACT The way the molecules is oriented and structured in a compound bears us the  broad basis how compounds do have different intrinsic properties. Properties of  an organic compound vary and immensely affected by their structure itself. It is  obtained in the experiment the melting points and the boiling points, which are  physical properties, of sixteen organic compounds. The micro method of analysis  on melting point was used to identify the first nine (9) compounds. Afterwards, a  comparison was made with respect to the intermolecular forces of attraction,  isomerism   and   purity.   Consecutively,   the   boiling   points   of   eight   (8)   organic  compounds were identified using the Thiele tube and glycerol to prove how  forces of attraction and branching have affected the said property. At the end of  the experiment, results lead to conclusion that greater intermolecular force and  Page 1 School of ChE-Chm Rotten Carbonoids Chm142L     B11 Group No. 11 07/30/2010
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more complex structure of molecule makes the boiling point higher while greater  purity, intermolecular force and a trans- isomer type makes the melting point of  an organic compound higher. I. INTRODUCTION Melting points and boiling points of  compounds   are   two   properties   of  compounds that can be found in the  temperature scale which reminds us  that   these   are   not   only   for   points  where   the   substance   changes  phases. These two points also give  us   an   idea   about   the   organic  compound’s   intermolecular  attraction,   and   other   attributes  dependent on structure Formally speaking, the melting point  of the compound is defined as the  definite   temperature   at   which   a  substance   changes   its   phase   from  solid to liquid. Adequate energy must  be   provided   to   overcome   and   to  break   up   the   intermolecular   force  binding the organic molecules.  Molecules   of   the   same   molecular  formula   may   also   differ   in   its  structure.   It   is   also   known   as  isomerism. This can affects organic  compound’s melting point as well as  the purity, or the intensity of solitary  of substance in a sample. On the other hand, boiling point, or  the temperature at  which   the   vapor   pressure   of   the  liquid becomes equal to the pressure  at the surface of the liquid, can be  affected   by   intermolecular   forces,  and   branching.   Complexity   of  substance may affect the strength of  forces between the molecules. The   experiment   aims   to   determine 
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This note was uploaded on 04/27/2011 for the course CHM 142 taught by Professor Ng during the Spring '11 term at Mapúa Institute of Technology.

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CHM142 experiment1 - SchoolofChEChm RottenCarbonoids...

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