Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, Al2O3?
A. The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions.
B. The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence, the greater force of attractions between them.
C. NaCl has a higher melting point because it is a solid at room temperature.
D. The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
Answer: B
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