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Ionic substances and exothermic lattice

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State which compound in each of the following pairs of ionic substances has the most exothermic lattice and why:

NaCl, CaS

Li2O, Na2O

LiF, NaCl

MgO, CaS

Plus two requirements that should be satisfied for a molecule to be polar

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Solution Summary

Solution explains which compound, in a multitude of pairs of ionic substances, has the most exothermic lattice.

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NaCl, CaS
NaCl has a more exothermic lattice because Na+ and Cl- ions are very strongly ionic and therefore, the lattice energy of NaCl is more than that of CaS

Li2O, Na2O
Li2O has a more exothermic lattice because Li+ ion has a smaller ionic radius when compared to Na+ ion, and therefore, the lattice energy of Li2O is more than that of Na2O.

LiF, NaCl ...

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