Copper(II) oxide decomposes at about 1500 C but Aluminium oxide decomposes at above 2000 C
No it would not. Al2O3 is very stable, and will not decompose
Mercury oxide can be decomposed, and in general, any chemical will decompose at a sufficiently high temperature.
It is a dark grey solid.
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No, Aluminum oxide is a pure substance.
Aluminum oxide will not decompose readily upon heating because it is a very stable oxide. Aluminum oxide is passive and is less affected by environmental factors.
No it would not. Al2O3 is very stable, and will not decompose
No.
Mercury oxide can be decomposed, and in general, any chemical will decompose at a sufficiently high temperature.
It is a dark grey solid.
Aluminum's density is 2.698
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Copper(II) oxide is CuO; II is an indication that in this compound copper is bivalent.
Al is the symbol for Aluminum and O is the symbol for oxygen. When oxygen is paired in a compound, it is changed to oxide. The name then is aluminum oxide.
Aluminum is an element and cannot "decompose" in the usual sense. It's also not very subject to oxidation ("rusting"), since it's a self-protecting metal which very rapidly forms a thin layer of aluminum oxide on the surface which then protects the rest of the metal from oxidation.
No, aluminum oxide is not metallic. But aluminum is.
The definition of aluminum oxide is various forms of aluminum oxide. This only occurred naturally as corundum.