2022-2022高二英语周报FMJ答案

27.(1)S写“S2”或“S”等均给分,2分)(2)Sb 3Fe -3Fe2 Sb3 (2分)(3)2(2分)(4)排除溶液中的O2,防止Fe2 被氧化(2分)(5) NaCIO2加入过多(2分)(6)正极(2分);4OH SO2-2e=9O- 2H2O(2分)【解析】本题主要考查制备锑白和磁性纳米Fe3O4胶体的工艺流程,考查学生对元素化合物的理解能力和综合运用能力。(1)根据氧化还原知识和流程图信息,推断出单质X是沉淀S(2)Fe3 比Fe2更容易被沉淀,故为了后续步骤锑铁分离而将Fe3 还原为Fe2(3)略。(4)通入H2的目的是排除溶液中的O2,防止Fe2 被氧化。(5)Fe3O4胶体中混有较多的Fe(OH)3,说明更多的Fe2 被氧化,原因有二:一是被 NaClo3氧化,二是被溶液中溶解的O2氧化。(6)略。【评分细则】(1)写名称不给分(2)未配平,但反应物和生成物均写对了给1分。(4)答防止制备过程中生成的Fe(OH)2被氧化等合理答案均给分。

写作【答案】 As indicated in a new study. early exposure to e- cigarettes may trigger tobacco smoking in teens.要点) Comparison oftobacco use initiation between students with e-agarettes experiences and those nonusers has been made, the resuit of whichreveals a significant increase of smoking tendency in the former (mt 3 with the prevalence of e-cigarettes, it's worthpaying attention to teens smoking pattens and considering the detrimental effects possibly exerted by e-cigarettes tet aV4)

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