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<center><b>Boiling Point (and other Phase Changes)</b></center><br> <br> <br> As you know, there is <b><nowiki>NO TEMPERATURE CHANGE</nowiki></b> during <b><nowiki>ANY PHASE CHANGE</nowiki></b> including boiling, freezing, etc.<br> <b>Boiling point</b> is the <b>temperature</b> where the <b>vapor pressure = atmospheric pressure in the container.</b><br> <br> <b>Boiling point</b> is a function of <b><nowiki>IMF</nowiki></b> and <b><nowiki>MW</nowiki></b> (molecular weight or molar mass). <br> <br> *For similar <b><nowiki>IMF</nowiki></b> substances, <b><nowiki>higher MW</nowiki></b> substances will have <b>higher Boiling Point</b>.<br> *For similar <b><nowiki>MW</nowiki></b> substances, <b><nowiki>higher IMF</nowiki></b> substances will have <b>higher Boiling Point</b>.<br> <b>[http://www.ausetute.com.au/intermof.html Excellent explanation of BP and IMF (Aus-e-tute website)]</b> <br> <br> <br> <b><nowiki>REMEMBER</nowiki>:</b> *<b>Vapor pressure</b> is the <b>pressure exerted by the vapor particles (in the gas phase) above a liquid layer</b> (the system must be closed, in other word, the container is sealed).<br> *Vapor pressure is indirectly related to the intermolecular force (<b><nowiki>IMF</nowiki></b>) keeping the liquid molecules held together. Therefore, the <b>higher the IMF</b>, the <b>less amount of vapor particles are in the gas phase</b>, and therefore, the <b>lower the vapor pressure.</b>
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