2022英语周报第16期高答案

读后续写Possible version lI stared at the paper and then looked around. I was cold. Although I could not see my sistersnor the new house, which was hidden from my sight by a grey wall, I got the feeling that I was notalone. Walking along the shore was a tall familiar figure who looked lost in his thoughts. I lookedgain at the paper in my hand, closed my eyes and wishedAs /opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. I smiled up at him and took his hand. Looking back, life fromthat day on marked the start of a close bond and a strong friendship with my father. What was mybirthday surprise? Wishes do come truePossible version 2I stared at the paper and then looked around. On the backside, there was a map. I noticed thatit was clearly leading me in a direction, but who could have sent this? I stood there in silence andstudied it. I decided to follow the map and it led me down the beach until I reached a staircase. Iooked back and could no longer see my siblings. I continued to follow the point on the map, untilI unexpectedly lost my footing and fell zksq down the stepsAs I opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. Then he asked how I had come upon this place? I explained tohim that I had found the bottle in the ocean and when I opened it had the words on it. Shocked bythe message, my father realized what I had found I threw this bottle into the ocean many years agowhen I was alone. he said. I used to come to this exact place to get away from everyone else. NowI get to share this experience with you. What a birthday surprise

21.(15分)(1)aC2+2H2O→Ca(OH)2+C2H2↑(2分)(2)除去乙炔气体中混有的H2S、PH3等杂质(2分)(3)1,2,3,1,2,2,4(2分)(4)《3分)(5)B(2分)(6)在E装置后再接一个盛有碱石灰的干燥管;向D中通入过量的乙炔,直至酸性KMnO溶液完全褪色,再测定D及E装置总质量的增加量(4分,各2分)【解析】(1)实验室制取乙炔的化学方程式为caCa+2H2O→→→Ca(OH)2+C2H2↑2)用电石制备的乙炔气体可能含有H2S、PH3等杂质,可以用CuSO溶液除去3)C2H2被KMnO氧化为CO2,根据得失电子守恒配平方程式。(4)根据题意D、E装置的增重为乙炔的质量根擔关系式:5FeSO4~KMnO4可知,与FeSO4反应的KMnO的物质的量为音mol,与乙炔反应的KMnO4的物质的量为(x-5)mol,则乙炔的物质的量为×(x-百)mol,乙炔的相对分子质量(5)A装置中产生的气体直接通人酸性KMnO4溶液中,杂质气体也被吸收,会产生误差;乙炔气流太快,通过KMnO4溶液时未被吸收,不影响结果;将E装置换成盛有浓硫酸的洗气瓶,则CO2不能被吸收,会产生误差。(6)本实验存在的不足:不能防止空气中水蒸气和二氟化碳对实验的干扰实验操作较为复杂,两次定量反应也会带来误差。据此进行改进:在E装置后再接一个盛有碱石灰的干燥管;向D中通入过量的乙炔,直至酸性KMnO4溶液完全褪色再测定D及E装置总质量的增加量。

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