LR 11 14 2014 1 List the 3 intermolecular forces of attraction and the force that exists between ions and polar molecules dispersion dipole dipole H bonding 2 Which intermolecular force is the strongest 3 What type of intermolecular force forces is are present in the following d dispersion PBr3 d d d d d dipole dipole H2O d d d H bonds NH3 d d d H bonds CH4 d H bonds CH3Cl d d d NaCl aq ion dipole CH3OH d d d H bonds HF d d d H bonds 4 Br2 and ICl have similar molar masses yet Br2 melts at 7 2 C while ICl melts at 25 2 C Explain Bromine is a non polar molecule with dispersion forces only while ICl is polar with dispersion and dipole dipole forces present 5 Which in each of the following pairs is more polarizable 6 a Xe or Ne b CO2 or CS2 c Cl2 or CH4 d NH3 or NF3 e AsBr3 or PF3 f H2 or O2 Which of the following ions would exhibit the strongest interaction with water Li Mg2 Al3 X4 has largest positive charge 7 Which intermolecular force is present in all substances dispersion forces 8 In order for hydrogen bonding to occur hydrogen must be bonded to N O F 9 Circle the species in each pair that has the higher boiling point H2Se or H2O HF or HI BH3 or NO2 There is hydrogen bonding in H2O and HF NO2 is polar BH3 is non polar 1 2
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