De kiem tra hoa chuong 1 hoa 8

Trường THCS Kiểm tra: 45 phút
Môn: Hoá Học 8
Họvà tên: ...........................................................................................Lớp: 8
Điểm



Lời phê của cô giáo

Đề bài
Câu 1. Trong các hiện tượng sau đây, hiện tượng nào là hiện tượng vật lí (HTVL), hiện tượng nào là hiện tượng hoá học (HTHH):
Hiện tượng nung đá vôi thu được vôi sống và khí cacbonic
Tinh bột bị biến đổi thành đường mantozơ
Cồn để trong lọ không kín bị bay hơi.
Thuỷ tinh bị nóng chảy.
Câu 2. Tính hoá trị của kim loại Sắt, Magê, Đồng. Nhôm, trong các công thức sau: CuO, Fe2O3, FeO, Al2O3.
Câu 3. Tính phân tử khối của các phân tử sau: Al(OH)3, Na2SO3, FeOH
Câu 4So sánh nguyên tử khối của Ba và Mg
Câu 5Các cách viết sau lần lượt chỉ ý nghĩa gì:
a. 5C, 4H, 3O
b. 1Mg, 3Al, 4Zn.
Câu 6. Dùng công thức hoá học biểu diễn các phát biểu sau:
a. 1nguyên tử hidro
b. 6 nguyên tử cácbon
c. 11 nguyên tử natri
d.13 nguyên tử nhôm
e. 20 nguyên tử canxi
f.16 nguyrn6 tử lưu huỳnh.
Bài làm
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