Chemistry : Intermolecular Forces Worksheet

1Name________________________Intermolecular Forces, Solubility and Melting PointsIntroductionIntermolecular forces are important concepts in organic chemistry. We can use it to explain: solubility,extraction, thin-layer chromatography, paper chromatography, gas chromatography, and columnchromatography, among other topics.In order to have a good understanding of IM forces, we need to have a grasp of dipole moments:Determine whether each compound below exhibits a molecular dipole moment.MoleculeLewis StructureDoes the moleculehave a dipole?CH4NoneNH3YesH2OYesCO2NoneCCl4NoneCH2Br2YesRecall that there are five types of IM forces: London dispersion forces, dipole-dipole, H-bonding, iondipole, and ion-ion. Indicate the strongest type of intermolecular force present in the followingcompounds:CompoundButaneIM ForceDipole-dipoleCompoundCH4CH3CH2OHNaClCH3OCH3Dipole-dipoleIon-ionLondon dispersionforcesCH3COCH3NaCH3OoctaneIM ForceLondon dispersionforcesDipole-dipoleIon-ionLondon dispersionforces2Which of the following pure compounds will exhibit hydrogen boding?Answer:The following will exhibit hydrogen bonding:a) CH3CH2OHf) CH3NH2h) NH3Draw the hydrogen bonding that takes place between:MoleculesDrawing of H-bondingOH (ethanol)NH2propylaminePhysical Properties and IM Forces:The strength of intermolecular forces determines the physical properties (i.e. melting point, boiling point,solubility, etc ...


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