(ii) Explain the differences between the melting points of these two chlorides in terms of their
structure and bonding. You should refer to the difference between the electronegativities
of the elements in your answer.
NaCl structure and bonding ...............................................................................................
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SiCl 4 structure and bonding ................................................................................................
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explanation .....................................................................................................
NaCl giant / lattice AND ionic
SiCl4 simple / molecular AND covalentFor NaCl large difference in electronegativity
(of sodium / Na and chlorine / Cl / Cl2) (indicates electron transfer/ions)
For SiCl4 smaller difference (indicates sharing/covalency) with (weak)
van der Waals’ / IM forces (between molecules) ora