TỔNG HỢP ĐỀ THI HỌC SINH GIỎI HÓA 9-CẤM SAO CHÉP DƯỚI MỌI HÌNH THỨC
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JENNY
27
Sở Giáo Dục & Đào Tạo
NGhệ an
Kỳ thi chọn học sinh giỏi tỉnh lớp 9 THCS
năm học 2010 - 2011
Môn thi: Hóa học - bảng a
Thời gian: 150 phút (không kể thời gian giao đề)
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Fe = 56; Cu = 64; Br = 80; Ba= 137.
wwwHết - - -
Sở Giáo Dục & Đào Tạo
NGhệ an
Kỳ thi chọn học sinh giỏi tỉnh lớp 9 THCS
năm học 2010 - 2011
Môn thi: Hóa học - bảng B
Thời gian: 150 phút (không kể thời gian giao đề)
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Cho: H = 1; Li = 7; C = 12, O = 16; Na = 23; Mg = 24; S = 32; Cl = 35,5; K = 39; Ca = 40;
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2. Chỉ đợc dùng thêm quì tím và các ống nghiệm, hãy chỉ rõ phơng pháp nhận ra các dung
dịch bị mất nhãn sau: NaHSO
4
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2
CO
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SO
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Hoà tan hoàn toàn 5,94 gam Al vào dung dịch NaOH d đợc khí thứ nhất. Cho 1,896 gam
KMnO
4
tác dụng hết với axit HCl đặc, d đợc khí thứ hai. Nhiệt phân hoàn toàn 12,25 gam KClO
3
có xúc tác, thu đợc khí thứ ba.
Cho toàn bộ lợng các khí điều chế ở trên vào một bình kín rồi đốt cháy để các phản ứng
xảy ra hoàn toàn. Sau đó làm lạnh bình để cho hơi nớc ngng tụ hết và giả thiết các chất tan hết vào
nớc thu đợc dung dịch E.
Viết các phơng trình phản ứng và tính nồng độ C% của dung dịch E.
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(Cho:H=1; O=16; C=12; S =32; Na=23, Cl=35,5; Ca =40; K=39; Mn=55; Al=27; Fe=56; Cu= 64;)
(Hc sinh c s dng bng HTTH v mỏy tớnh theo quy nh ca B GD&T)
A4
