de kiem tra hoa chuong 1 hoa 8
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Trờng 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 tợng sau đây, hiện tợng nào là hiện tợng vật lí (HTVL), hiện tợng nào là
hiện tợng hoá học (HTHH):
a. Hiện tợng nung đá vôi thu đợc vôi sống và khí cacbonic
b. Tinh bột bị biến đổi thành đờng mantozơ
c. Cồn để trong lọ không kín bị bay hơi.
d. 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
, Na
2
SO
3
, FeOH
Câu 4.. So sỏnh nguyờn t khi ca Ba v Mg
Câu 5.. Cỏc cỏch vit sau ln lt ch ý ngha gỡ:
a. 5C, 4H, 3O
b. 1Mg, 3Al, 4Zn.
Câu 6. Dựng cụng thc hoỏ hc biu din cỏc phỏt biu sau:
a. 1nguyờn t hidro
b. 6 nguyờn t cỏcbon
c. 11 nguyờn t natri
d.13 nguyờn t nhụm
e. 20 nguyờn t canxi
f.16 nguyrn6 t lu hunh.
Bài làm
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