英语周报新目标七年级上册2021-2022unit7-9第十五期答案

20.(14分)I.(1)H:0:1(2分，唯一答案)(2)CIO+H2O+CO2—HClO+HCO:(2分，化学式全部写对才给分，写出化学方程式且正确给1分)Ⅱ.(3)强氧化(1分)(4)2.5(2分)(5)①0.2(2分)4.48(2分)②2NaC1O3+4HC1(浓)=2ClO2◆+Cl2◆+2NaC1+2H2O(3分，写出C1O2和Cl2给1分，其他化学式也正确再给1分，气休符号写对再给1分)【解析】I.(1)在HC1O分子中O原子分别与H、Cl原子各形成1对共用电子对，从而使分子中各原子都达到稳定结构，其电子式为H:O:C。(2)由于碳酸的酸性强于次氯酸，次氯酸的电离程度大于碳酸氢根离子，“84”消毒液在空气中放置时，主要成分次氯酸钠能与空气中的二氧化碳反应生成碳酸氢钠和次氯酸，溶液中次氯酸的浓度增大，漂白效果增强，反应的离子方程式为C1)+H2O+CO2=HClO+HCO,故答案为：ClO+H2O+CO2-HCIO+HCO5。Ⅱ.(3)由二氧化氯可以氧化Fe+可以得出二氧化氯具有强氧化性，(4)根据题意，1 mol Cl2还原为C1-时提供2mole,而1 mol ClO2还原为C1-时能提供5mole,枚相同物质的量的C1O2的消毒效率是C12的2.5倍。(5)①H2O2为还原剂被氧化，生成O2,反应中有0.1molH2O2参加反应时，转移0.2mol电子，则产生的ClO2气体的物质的量是0.2mol,其在标准状况下的体积为0.2mol×22.4L/mol-4.48L。②根据题目信息和氧化还原反应规则，先推出单质气体为氯气，故化学反应方程式为：2 NaClO十4HCI(浓)=2C1O2↑+Cl2↑+2NaC1+2HO。

第:节长長达(满分25分) Possible versionDate: March 21.2021The annual translation competition on Chinese poetry is going to be held online trom March 2& to 30 byschools English Chub. Any student who would like to participate needs to email the translation totranlslation-202lyahoo.com,andattachano-longer-than-3-minutevideoofpertormingthetranslationinspecially designed scene related to the poem. Then based on ten professional judges decision, there will be afirst-prize winner, two second-prize and five third-prize. The awards are more than wonderful and appealing, suchas Kindles and gil cards of Xinhua BookstoreAll of you, including the overseas students, are welcome to join in the activity. Not only can the experiencehelp you to gain a deeper understanding of Chinese culture and history, but it also gives you an opportunity to showhow well you master both Chinese and English. So what are you waiting for? Just begin your translationThe english Club

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