Các phương pháp giải nhanh Hóa học 10
Viết các phương trình hóa học phản ứng xảy ra (nếu có) khi lần lượt cho các chất sau tác dụng với Clo, Br2, I2:
a) K, Na, Rb, Mg, Ba, Al, Fe, Ca, Zn, Cu, H2, H2O.
b) KOH(ở t0 thường), KOH(ở 1000C), NaOH, Ca(OH)2, KBr, NaBr, NaI, KI, MgBr2, CaBr2, BaBr2
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................................................................................................. .......................................................................................................................................................... 28. (ĐH khối B – 2010) Hòa tan hoàn toàn 2,44 gam hỗn hợp bột X gồm FexOy và Cu bằng dung dịch H 2SO4 đặc nóng (dư). Sau phản ứng thu được 0,504 lít khí SO2 (sản phẩm khử duy nhất, ở đktc) và dung dịch chứa 6,6 gam hỗn hợp muối sunfat. Phần trăm khối lượng của Cu trong X là A. 39,34%. B. 65,57%. C. 26,23%. D. 13,11%. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... 29. (ĐH khối B – 2010) Trộn 10,8g bột Al với 34,8g bột Fe3O4 rồi tiến hành phản ứng nhiệt nhôm trong điều kiện không có không khí. Hoà tan hoàn toàn hỗn hợp rắn sau phản ứng bằng dung dịch H2SO4 loãng (dư) thu được 10,752 lít khí H2 (đktc). Hiệu suất của phản ứng nhiệt nhôm là A. 80% B. 90% C. 70% D. 60% .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... 30. (ĐH khối B – 2010) Hoà tan hoàn toàn 2,45 gam hỗn hợp X gồm hai kim loại kiềm thổ vào 200 ml dung dịch HCl 1,25M, thu được dung dịch Y chứa các chất tan có nồng độ mol bằng nhau. Hai kim loại trong X là A. Mg và Ca B. Be và Mg C. Mg và Sr D. Be và Ca .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... CHUYÊN ĐỀ 6 CÁC NGUYÊN TỐ NHÓM HALOGEN PHẦN I. BÀI TẬP LÝ THUYẾT DẠNG 1. BỔ TÚC VỀ PHƯƠNG TRÌNH PHẢN ỨNG Viết phương trình phản ứng đơn thuần, hoàn thành phương trình Bài 1. Viết các phương trình hóa học phản ứng xảy ra (nếu có) khi lần lượt cho các chất sau tác dụng với Clo, Br2, I2: a) K, Na, Rb, Mg, Ba, Al, Fe, Ca, Zn, Cu, H2, H2O. b) KOH(ở t0 thường), KOH(ở 1000C), NaOH, Ca(OH)2, KBr, NaBr, NaI, KI, MgBr2, CaBr2, BaBr2 ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... 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Bài 2. Viết các phương trình hóa học phản ứng xảy ra (nếu có) khi lần lượt cho các chất sau tác dụng với HCl, HBr: a) K, Na, Rb, Mg, Ba, Al, Fe, Ca, Zn, Cu, H2. ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... .............................................................................................................................................
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