Câu 14(2 đ) : Nêu ý nghĩa của các hợp chất sau: a. FeSO4 b. Ca(OH)2 Câu 15(2đ): a. Tính hóa trị của Mg trong hợp chất MgCl2, biết Cl(I) b. Lập công thức hoá học của hợp chất tạo bởi kẽm (Zn) hoá trị (II) và nhóm (PO4) hóa trị (III) Câu 16 (2đ) Một hỗn hợp gồm bột nhôm, bột sắt và muối ăn nghiền nhỏ. Nêu phương pháp tách riêng 3 chất ra khỏi hỗn hợp. (Biết Fe=56, S= 32, N=14, O=16, H=1)

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