Câu 1: Trong thành phần một oxit kim loại hoá trị III, nguyên tố k chiếm 70% khối lượng. Xác định công thức oxit Câu 2:Nêu tính chất hoá học của oxi ,hiđro, nước . Viết PTHH minh hoạ cho mỗi loại phản ứng sau: a) Oxi hoá một kim loại thành oxit kim loại b) Oxi hoá một phi kim thành oxit phi kim c) Kim loại tác dụng với nước tạo thành bazơ và khí hiđro d) Oxit bazơ tác dụng với nước tạo thành bazơ e) Oxit axit tác dụng với nước tạo thành axit f) Khử oxi của oxit kim loại tạo thành kim loại và nước g) Phân hủy một hợp chất bằng nhiệt ( nhiệt phân) h) Phân hủy một hợp chất bằng điện ( nhiệt phân)

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