2022-2023 英语周报 八年级 外研 10LZG答案

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

17.(1)H:C::C:H(2分)2)能耗低(或产物易分离,2分)(3)45(2分)(4)C2H(g)+CO2=C2H(g)+(O(g)+H2O(1)△H=+133.2kJ·mol-(2分);积碳能与CO2反应生成CO,从而脱离催化剂表面(2分)(5)氢气移出率增大,体系中氢气的浓度降低,平衡正向移动,乙烷的平衡转化率增大(2分);90%(2分)【解析】本题主要考查化学反应原理,考查学生对化学反应原理的理解能力和综合运用能力。HH(1)乙烯电子式为H:C::C:H(2)氧化裂解反应是放热反应,节约能源(3)因为总压恒定为100kPaC2H(g)2(2(g)C2H4(g)+HyO(g)平衡分压2.4%×100kPa4%×100kPa18%×100kPa12%×100kPa该温度下的平衡常数K2=486×10×12%×10045(kPa)(2.4%×100)×(4%×100)(4)由盖斯定律①一②+③得热化学方程式C2H(g)+CO2=C2H4(g)+CO(g)+H2O(1),则△H=(+136kJ·mol)-(-283.0kJ·mo-)+(-285.8kJ·mol-1)=+133.2k·mol-l;该工艺中碳与CO2反应生成CO,可以有效消除催化剂表面的积炭,维持催化剂活性(5)氢气移出率增大,生成物中氢气的浓度降低,有利于平衡正向移动,乙烷转化率增大;A点时乙烷的转化率为90%,生成H2的总物质的量为0.9mol,设平衡时体系中H2的物质的量为x,平衡体系中,c(乙烷)=0.1mo·-,c(乙烯)=0.9ml.1-,c(H1)=xmol·L,平衡常数K=0=0.,解得x0.09mol,则氢气移出率a≈=9.9-0.090.9×100%=90%

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