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20 14 Foshan Ermo Science Mathematics
(1) Sodium carbonate solution and sodium hydroxide solution can react with grease to wash away oil stains and remove oil stains on the surface of iron filings.

(2) Iron filings react with dilute sulfuric acid to generate ferrous sulfate and hydrogen, and the chemical equation of the reaction is Fe+H2SO4 = FeSO4+H2 ↑; The valence of hydrogen before the reaction is+1, and that after the reaction is 0; The valence of iron before the reaction is 0, and it becomes +2 after the reaction, so the changing elements are hydrogen and iron, and the symbols of the elements are H and Fe.

(3) According to the meaning of the question, if a tablet contains 0. 16g ferrous sulfate as the main component, taking one tablet is equivalent to iron supplementation = 0.16g× 5656+32+16× 4× ≈ 0.06g. 。

So the answer is: (1) AC; (2) hydrogen and iron; (3)0.06.