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Đề thi giữa học kì 2 môn Hóa học lớp 8 năm 2020-2021 - Trường THCS Đại Tự

Chia sẻ: Zhu Zhengting | Ngày: | Loại File: DOCX | Số trang:4

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Thực hành giải “Đề thi giữa học kì 2 môn Hóa học lớp 8 năm 2020-2021 - Trường THCS Đại Tự” giúp các bạn củng cố lại kiến thức và thử sức mình trước kỳ thi. Hi vọng luyện tập với nội dung đề thi sẽ giúp các bạn đạt kết quả cao trong kì thi giữa học kì 2 sắp tới. Chúc các bạn thi tốt!

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Nội dung Text: Đề thi giữa học kì 2 môn Hóa học lớp 8 năm 2020-2021 - Trường THCS Đại Tự

  1. TRƯỜNG THCS ĐẠI TỰ            BÀI KIỂM TRA GIỮA KÌ II – NH 2020­2021 Họ và tên:......................................... MÔN: HÓA 8    (Thời gian 45 phút) Lớp:...       Điểm                             Lời phê của cô giáo ĐỀ I: Phần I: TRẮC NGHIỆM:  Khoanh vào đáp án đúng nhất: Câu 1: Dãy các oxit sau là oxit axit A. K2O, CuO, CaO, SO2                                    B. K2O, CO2, N2O5, SO2 C. CO2, N2O5, SO3, SO2                                     D. K2O, CuO, CaO, MgO Câu 2: Chất được dùng để điều chế oxi trong phòng thí nghiệm là.  A. KClO3  và KMnO4                                         B. KClO3  và CaCO3      C. KMnO4 và H2O                                             D. KMnO4 và không khí Câu 3: Người ta thu khí oxi bằng cách đẩy nước là dựa vào tính chất A. khí oxi ít tan trong nước                                B. khí oxi tan trong nước C. khí oxi khó hóa lỏng                                      D. khí oxi nhẹ hơn nước Câu 4: Quá trình nào dưới đây không làm giảm lượng oxi trong không khí? A. Sự gỉ của các vật dụng bằng sắt                      B. Sự cháy của than, củi, bếp ga C. Sự quang hợp của cây xanh                             D. Sự hô hấp của động vật Câu 5: Phản ứng nào dưới đây là phản ứng hoá hợp A. CuO + H2  ­> Cu + H2O                            B. CaO +H2O ­> Ca(OH)2  C. K2MnO4  ­> K2MnO4 + MnO2 + O2         D. CO2 + Ca(OH)2­> CaCO3 +H2O Câu 6 : Sự tác dụng của oxi với một chất gọi là : A. sự thở              B . sự cháy                 C. sự đốt nhiên liệu                  D. sự oxi  hóa                   PHẦN II: TỰ LUẬN Câu 7: Hoàn thành các PTPƯ sau:     a) ......+ ......   Al2O3                                                c)......+...... 2 3  Al S     b) KClO3  .... + ....                                    d) HgO  .....+ .... Câu 8: Đốt cháy 3,1g phốt pho  trong một bình chứa 25,2 lít khí O2 nguyên chất (ở  đktc).  thu được điphotphopentaoxit a) Chất nào dư ? và dư bao nhiêu gam? b) Tính khối lượng sản phẩm thu được? Câu 9: Khí axetilen C2H2 cháy sinh ra khí cacbonic và hơi nước đồng thời tỏa nhiệt  a)Viết PTPƯ b)Tính  V không khí cần dùng để  đốt cháy hết 11,2 lít khí axetilen trên( Biết  Voxi=1/5  Vkk)                                                                    BÀI LÀM
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