2022英语周报高一 北师大版答案

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

27解析:(1)根据装置|可知反应均为 NaCIC3、H2SO4和H2C2O1,产物有ClO2,可推知HCO4被氧化为CO2,配≯得化学方程式为 NAclo I2C2O4+H2SO4=2(lO2‘CCO:' I Na SO I 211: o( 2NaClO, I 211: SO, I ll CNO2CIO: t I 2Nal ISO:I 21: OI2(O:↑):根据已知以,结合反应产构,可推瀾该反应的最大优,点是反应中生成的CO2对CO2起到稀作,提高了实验的安全。(-)Ⅱ为电解CO2制备NaCI2,故圭成成品液NaCO2的电枫为阴枫,a极为负极,生成C1O2其电极反应式为CO2e—CO2:阳极室Na邇过阳翥子交膜逃入阴家,生成NaC"O2。(3)控制反应温度为3℃,可采取的措施为3℃冷水浴:根据“处理后所得溶液与茕Ⅱ所得成品液合并处理得到严品”泛明ClO2生成了C"O2·则H2O2化合价高生成O2,故反的瀉子方程式为H2O2ClO22OH'O2O2十2H2O。(4)从溶疫申訂取昌依,一般流稈是蒸发浓、冷却结晶、过滤、洗涤、燥。根掘信息②,蒸发『分河时昉亡分髜,只能减瓜蒸发,a正碗;为昉上酽出NaC"IO2·3H2O晶体,应该趁热过滤,b昝误、c正确:为肪止分解和结晶.F38~6℃温水洗去杂质,d正确:为防止分郫,府该在低于6)℃下干燥得到产品,e错溪、f正确。(5)产品中加入足量酸化的KI溶液,发生CIO2+4+4-C+212+2H10,勿入淀粉溶变显藍色,当用0200mol·LNa2S2O3标准液滴定吋,发生2Na2S2O3+l2=Na2S/O6+2Nall2邃渐湔耗,当溶液由藍色变无色,且分钟不惔复时,说明达到滴定终点。依振关系式CIo2l2dNa,S-O,r mol0.300X(1Dml00lmol×50×905g.mol解得x=001,声品NaCk2的钝度为1P°a=95°a。答案:(15分,除标注外,其余每空2分)(1)2NaC1O3t H: C2O:+H2SOcC1O2↑+2CO21+Na2SO4+2H2O(或 NaclO+2H2SO4+H2C2O12ClO2↑+2 NaSO4+2H2O+2CO2)反应中生成的CO2对ClO2起到稀释作用,提高了实验的安全生(2)负(1分)CO2+e=ClO2(1分)阳(1分)(3)3℃冷水溶(1分)H2O2+2CO2+2OH=2CO2+O2+2H2O( cdt(5)当溶液由葚色变无色,E半分钟内不恢复(1分)90.5°0

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