Kiểm tra 1 tiết ( Tiết 25theo phân phối chương trình)

Trng THCS Xi Mng
Kim tra mụn: Húa hc lp 8 Thi gian: 45 Phỳt
H v tờn:
im Li phờ ca cụ giỏo
BI V BI LM
Cõu 1(3). Cho sơ đồ phản ứng
a. Na + O
2
---> Na
2
O.
b. Al + O
2
---> Al
2
O
3
.
c. CuO + HCl ---> CuCl
2
+ H
2
O
d. Al + O
2


0t
Al
2
O

3
g. P + O
2


0t
P
2
O
5
h. NaOH + FeSO
4


Fe(OH)
2
+ Na
2
SO
4
i. KClO
3


0t
KCl + O
2
1/ Lập PTHH.
2/ Cho cho bit t l s nguyờn t, phõn t ca cỏc cht, trong tng phn ng.
Cõu 2(2). Chọn nội cột (II) phù hợp với khái niệm cột (I).

Cột I Cột II
A. hiện tợng hoá học
B. Hiện tợng vật lí
C. Phản ứng hoá học
1. Cồn bay hơi
2. Than cháy trong khí oxi
3. ở nhiệt độ cao, một số kim loại ở trạng thái lỏng.
4. Sắt bị gỉ trong nớc.
5. Đồng nặng hơn sắt.
Cõu 3(5). Canxi cacbonat (CaCO
3
) l thnh phn chớnh ca ỏ vụi. Khi nung ỏ vụi xy
ra phn ng hoỏ hc: Canxi cacbonat

Canxi oxit + Cacbon ioxit.
Bit rng khi nung 310 g ỏ vụi to ra 168 g canxi oxit (CaO) v 132 g khớ cacbon ioxit
(CO
2
).
a. Vit cụng thc v khi lng ca cỏc cht trong phn ng.
b. Tớnh t l phn trm khi lng ca canxi cacbonat trong ỏ vụi.
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