The composition of aluminum foil is NOT 100% pure aluminum, as many people believe. You may have noticed that aluminum foil always seems dull on one side, and shiny on the other. This is caused by a naturally-occurring reaction. When Aluminum comes into contact with oxygen, the two elements undergo a spontaneous reaction: 4 Al(S) + 3 O2 (G) => 2 Al2O3 (S) The aluminum foil reacts with oxygen in the air to form a thin layer of Aluminum Oxide on one side of the foil. Because rolls of aluminum foil are generally rolled tightly, the inner side of the aluminum foil is not exposed to the air as much, and it remains shiny. In short, the composition of aluminum foil is pure aluminum (Al) AND aluminum oxide (AL2O3). (And don't worry-- the layer of aluminum oxide on aluminum foil is completely harmless. We've been using foil to cover food for years, after all.)
Aluminum (Al) foil doesn't have a "molecular formula" because it's all aluminum. The foil is made from a solid block of refined aluminum (all Al) and rolled and rerolled to compress it and form the foil. One way to evaluate aluminum foil might be to look at the metallic crystal structure that results at the end of the rolling process through which the foil is manufactured. But that requires another question.
Alumina is synthetic aluminum oxide of the molecular formula Al2O3. It is used in the smelting of aluminum metal, as a raw material for ceramics, and in chemical processing.
Al2 O3
Aluminium Oxide
Al2 (SO4)3
Al2O3
Al(s)
C3Al2O9
An aluminum can is made up of the pure substance, aluminum. This means that it has the chemical formula of Al. The surface of aluminum does oxidize, so it will have the formula Al2O3.
Aluminum hydroxide chemical formula is Al(OH)3.
It's a chemical change. The aluminum foil is rusting, which cannot be undone, meaning that this is a chemical change, not a physical. Physical changes can be reversed.
The chemical formula for aluminum sulfide is Al2S3.
Formula: AlI3
Physical. It's still aluminum foil.
Aluminum in itself does not have a chemical formula, because chemical formulas are only used for compounds, and Aluminum does not have a chemical formula - only a symbol (which can be found on the periodic table of elements).
An aluminum can is made up of the pure substance, aluminum. This means that it has the chemical formula of Al. The surface of aluminum does oxidize, so it will have the formula Al2O3.
The chemical formula of aluminum chloride is AlCl3.
Aluminum hydroxide chemical formula is Al(OH)3.
Physical. It's still aluminum foil.
The formula for aluminum oxide is Al2O3.
The chemical formula of aluminum clofibrate is C20H22AlCl2O7.
Formula: Al
Aluminum and Nitrogen create a compound named aluminum nitride, its Chemical formula is AlN
It's a chemical change. The aluminum foil is rusting, which cannot be undone, meaning that this is a chemical change, not a physical. Physical changes can be reversed.
The chemical formula for aluminum sulfide is Al2S3.