衡水金卷先享题信息卷2022英语二试卷答案

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第三部分第一节(满分15分)、参考范文:Dear PeterI write to inform you about the schools class schedule adjustment during the coming LaDay holiday.The holiday begins on Ist May and ends on Sth May, but you will have to work on the followingSunday Therefore, there's a new class schedule for you, which has been attached to this e-mailPlease remember to read the attached file and make sure you know about the new class arrangementin advance. If you have any question, feel free to contact me.Wish you a happy holiday.Li Hua

参考答案C说明分析Δ正确,乙醇易挥发,且Cul不溶于乙醇,故可用乙醇洗涤CuCl,既能洗去晶体表面的杂质离子及水分,使CuCl更易干燥,又能防止其氧化和水解。B正确,为防止CuC被氧化和水解,应隔绝空气和水干燥时可在真空中进行。C错误,滤液中含有NaC、HNO3、HC,故可利用的物质共有3种。D正确,CuCl在潮湿的空气中易水解氧化为碱式氯化铜,故用去氧水稀释的目的是使[CuC2]转化为CuCl,同时防止CuCl被氧化