内容正文:
2019~2020-1 高一年级期中考试
化学 答案
一、选择题(每题只有一个正确选项,每小题 3 分,共 51 分)
题号 1 2 3 4 5 6 7 8
答案 B A A C A C B D
题号 9 10 11 12 13 14 15 16
答案 C C D D D B D C
题号 17
答案 C
二、非选择题
18.(12 分)
(1)1:1 (2)1:7 (3)16:11 (4)M/NA (5)0.4 (6)1∶3∶3
19.(13 分)
(1)②⑤ (2)①⑥ (3)①③⑥⑦
(4) FeCl3+3H2O Fe(OH)3(胶体)+3HCl 电中性 小于
20.(14 分)
(1)②③⑤ (2)4.0 A 玻璃棒,胶头滴管 (3) 25.0 D
21.(10 分)
(1)H+、Ba2+、Cl﹣ Mg2+、SO42﹣、CO32﹣ Ba2+ + CO32- = BaCO3↓
(2)H++ HCO3-==CO2↑+H2O Mg(OH)2+2H+==Mg2++2H2O
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