2022英语周报19必修二答案

6.〈每空2分,共1)平衡气压,使液体顺利滴下〈或其他合理答案2)三颈烧瓶3)持续通入氮4> FeCO3 2HNCHCOOH-CHNCHCOOhFe+ COT+ H2O5)降低甘氨酸亚铁的溶解度,促使其结或其他合理答案6)偏压滴液漏斗〈仪器的导管将漏斗上方和三颈烧瓶连通,可以平衡压强液体顺利滴下器b为三颈烧瓶3)持续往装置氮气,可将装置内的空气排出,并且N2气流通过反应液时,能起搅拌的作用,除去反应液中溶解的氧气,防止亚铁离子被氧气氧化4)FeCO3和HNCH2COOH反应的化学方程式为FeCO+2H2 NCHCOOH(H-NCHCOO)hFe +CO T+H2O5)甘氨酸亚铁易溶于水,难溶于乙醇,步骤加入无水乙醇,降低甘氨酸亚铁在反丿的溶解度,促使其结晶析6)甘氨酸根中含有氨基,可以被酸性高锰酸钾溶液氧化消耗高锰酸钾溶液的体积偏大故所得结果比实际值偏大7)三次滴定第二次操作消耗标准液数值明显偏大,应舍去,取第一次和第三次平均值(1945mL+1955mL)2=1950mL,由:Ce4+Fe2+=Ce3+Fe2500mL溶液中n(Fe2+)(Cc4+)=0.10000lL×1950×103=1950×10-3mol,故250m含有n(Fe2)250mL950×103mol×25mL=1950×102mol,故乳酸亚铁晶体的质量分数为1950×102molxx100%=9945%400

第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a debreath. I saw two young men in canoes, racing each other.I was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and Bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded me ifor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

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