天津市蓟州区2019届高三化学上学期期中试题2019011602152.doc

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1、1天津市蓟州区 2019届高三化学上学期期中试题23456789高三化学 参考答案 题号 1 2 3 4 5 6 7 8 9 10答案 B A C D B D C A C B题号 11 12 13 14 15 16 17 18 19 20答案 A D D C D A B D C D21 (10 分,每空 2分)(1)第三周期第A 族(2)r( Na)r(S)r(O) 离子键 、共价键 (3)略 (4)2SO 2(g)O 2(g) 2SO3(g) H196.6 kJmol 122 (10 分)(1)Ag 、 Mg2 、Ba 2 (2 分) (2)SiO 2H H2SiO3(胶体)(2 分)23(

2、3) (每空 1分)(4)存在,其最小浓度为 0.8 molL1 (2 分)23.(14 分,每空 2分)(1)Cl 22OH Cl ClO H 2O (2)Cl ClO 2H H 2OCl 2(3) pH 越大,红纸褪色越慢 b 烧杯中溶液的 pH大于 c烧杯中溶液的 pH,HClO 浓度较小,反应速率较慢,褪色较慢(4) SO 22ClO 3 2ClO 2SO 42 0.5(5)S 2O32 4Cl 25H 2O2SO 42 8Cl 10H 24(16 分) (1)增大青蒿与乙 醚的接触面积,提高青蒿素的浸取率(2 分)(2)漏斗、玻璃棒、烧杯;(2 分)蒸馏(1 分) (1)afgdebch (2 分)(2)CaCl 2;(1 分)吸收 C装置生成的水分(1 分)使青蒿素充分氧化生成 CO2和 H2O(1 分)浓硫酸;(1 分)吸收 A装置产生 O2中的水蒸气(1 分)吸收 C装置产生 CO2气体(1 分)防止空气中 的 CO2和 H2O进入装置 E中(1 分)(3)C 15H22O5(2 分)阴离子 NO3 CO23 SiO23 SO24c/(molL1 ) ? 0.25 0.4 0

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