Which of these two ionic compounds has the higher melting point: sodium oxide or aluminium oxide? Why?
Answers
Answer:
Aluminium oxide is insoluble in water, so it must be molten to act as an electrolyte. However, the melting point of aluminium oxide is high. A lot of energy must be transferred to break its strong ionic bonds , and this is expensive.
Explanation:
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Answer:
Answer:
I suppose it is the #"alumina"#.
Explanation:
For sodium chloride, each of the constituent ions have unit charge. For alumina, the ionic lattice is composed of #Al^(3+)# and #O^(2-)# ions. Because the electrostatic force of attraction should be greater we would predict that alumina should have the greater melting point. The aluminum cation is also smaller than the sodium cation and thus more polarizing.
And now your job. Find the melting points of alumina and sodium chloride and compare them. I might be mistaken.
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