题干

某校研究性学习小组设计实验,制取氯气以探究Cl2、Br2、I2的氧化性强弱(制取氯气的化学方程式为:MnO2+4HCl(浓) =MnCl2+Cl2↑+2H2O),实验装置如图所示:
【实验探究】
(1)制取氯气的反应____ (填“是”或“不是”)氧化还原反应.
(2)C装置中发生反应的化学方程式为____ .
(3)D装置中溶液变____ (填“黄色”或“蓝色”).
(4)E装置的作用是____  .
(5)若要制取标准状况下4.48L的Cl2,需要MnO2的质量为____  g.
(相对原子质量:H﹣1 O﹣16 Cl﹣35.5 Mn﹣55)
【实验讨论】
有些同学对上述实验装置持有不同看法:
甲同学认为:B装置是多余的.
乙同学认为:B装置是必须的.
你认为 ____ (填“甲”或“乙”)同学的看法是正确的.
【结论分析】
实验现象表明,C装置中有Br2生成,D装置中有I2生成,说明Cl2的氧化性比Br2、I2强.但依据本实验能否判断Br2、I2的氧化性强弱,有些同学得出不同结论:
丙同学的结论是:可以判断Br2的氧化性比I2强.
丁同学的结论是:无法判断Br2的氧化性比I2强.
你认为____ (填“丙”或“丁”)同学得出的结论是合理的.
上一题 下一题 0.0难度 选择题 更新时间:2019-11-04 02:41:29

答案(点此获取答案解析)

是,Cl2+2NaBr=2NaCl+Br2,蓝色,吸收尾气,防止污染,17.4,甲,丁

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