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sunny2007
2 năm trước
1.a) SO2 ---> Na2SO3 --->NaHSO3---> Na2SO3---> Na2SO4 b) CO2 --->Na2CO3 --->NaHCO3---> Na2CO3---> NaOH 2.C--->CO--->CO2--->Ca(HCO3)2--->CaCO3--->CaO Câu 3: Có 3 lọ đựng 3 chất rắn : NaCl , Na2CO3 ; CaCO3 không dán nhãn. Bằng phương pháp hoá học, hãy nhận ra từng lọ và viết các phương trình hoá học để minh hoạ. Câu 4. Do có tính hấp phụ, nên cacbon vô định hình được dùng làm. A. Lọc nước, mặt nạ phòng hơi độc. B. Ruột bút chì, chất bôi trơn. C. Mũi khoan, dao cắt kính. D. Điện cực, chất khử.
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