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02 Phase changes and intermolecular forces_2.pdf

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Department
Chemistry
Course
CHEM102
Professor
All Professors
Semester
Fall

Description
Effect of intermolecular forces on compounds physical propertiesBoiling pointMelting pointVapour pressure of a liquid Solubility in water and different solvents Types of intermolecular forcesIonDipole forces the strongest This is the attraction between an ion and a nearby polar molecule The most common example of this type of intermolecular force takes place when an ionic compound dissolves in waterConsider NaCl dissolves in water O l Na aqCl aqNaCl sxH2Usually six water molecules surround an ion in iondipole interaction HOHHHHHOOOHHHOHOHClHNaHHHHHHOOOOHOHHHHOH The strength of the iondipole force depends on three factors Applying the Coulombs Law Charge A x Charge B Electrostatic force2Distance The greater is the ionic charge Charge A the stronger is the iondipole force the hydration energyThe larger is the dipole moment of the solvent Charge B the stronger is the iondipole forceThe smaller is the ion the stronger is the iondipole forceArrange the order of iondipole force for the following ions in water 2 Na Ca and K2
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