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occhotranphuong
2 năm trước
Câu 1. (3 điểm) Viết tên của các chất có CTHH sau, cho biết mỗi chất thuộc loại hợp chất gì? a) NaHCO3. b) K2S. c) H2S. d) Cu(OH)2. e) Al2O3. g) Cu2O. h) SO3. i) KOH. Câu 2. (4 điểm) Cho m gam bột sắt tác dụng hoàn toàn với dung dịch HCl 10% thu được 1,12 lít khí hiđro (ớ đktc). a) Viết PTHH của phản ứng trên. b) Tính khối lượng bột sắt (m). c) Tính khối lượng dung dịch HCl cần dùng. (Biết: Na = 23 ; Cu = 64 ; Fe = 56 ; S = 32). 2 bài 40đ
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