Write the formulas for iron (3) and silicon (4) oxides. What are oxides?

Ferric oxide has a chemical formula: Fe2O3. Trivalent iron oxide belongs to the group of amphoteric oxides. The environment is more alkaline than acidic. Does not react with water. In nature, it is found in deposits of such a compound as hematite. It is used in ferrous metallurgy and industry.
Silicon oxide tetravalent has a chemical formula: SiO2. It is also called silicon dioxide. Tetravalent silicon oxide belongs to the group of acidic oxides. Silicon dioxide is very common in the terrestrial rocks of our planet. Silicon oxide does not react with water. It is used in the food and pharmaceutical industries.

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