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Anonymous users2024-01-242Al2O3=2Al2O3
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Anonymous users2024-01-23(1) According to the conditions of rust, the anti-rust method of the kitchen knife that has been cut is to wash it, and then keep it dry, and it is difficult to rust without contact with moisture, so the answer is: keep it dry;
2) Aluminum and oxygen react to form alumina, and the chemical equation of the reaction is: 4Al+3O2 2Al2O3 So the answer is: 4Al+3O2 2Al2O3;
3) The main component of rust is Fe2O3, it will react with dilute hydrochloric acid, the solution changes from colorless to yellow, the equation of the reaction is: Fe2O3+6HCl=2FeCl3+3H2O, when the rust reaction is completed, the iron inside continues to react with hydrochloric acid, producing bubbles, the equation of the reaction is: Fe+2HCl=FeCl2+H2 So the answer is:
The rust gradually dissolves and the solution changes from colorless to yellow; Fe2O3+6HCl=2FeCl3+3H2O；There are bubbles coming out; Fe+2HCl=FeCl2+H2↑
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