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) NaCl has a higher melting point because it is a solid at room temperature.
C) 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.
D) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
C
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How would the eruption of a volcano cause global climate changes?
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The principle of interposition in visual perception suggests that
A. An object with an incomplete outline appears behind another. B. An object with an incomplete outline appears at the same level as another. C. An object with an incomplete outline appears in front of another.