18.(1)+123.9k1·mol(2分)(2)升温、降压(2分)(3)p:P(2分)(2分)(4)丙烷燕气中擦人水蒸气,可以达到减小丙烷蒸气分压的作用,减压有和于平衡正向移动,可以提高丙烷的平衡转化率(2分,答案合理即可)(5)催化机理1(2分)逆反应活化能越大,则正反应活化能越大,活化能越大,反应速率越慢(2分)【解析】(1)由反应C3H(g)=C3H4(g)+H2(g)可知其△H=-2220.4kJ·mol-1-(-2058.5kJmol1)-(-285.8kJ.mol-1)=+123.9kJ.mo-。(2)反应C3H1(g)=CH1(g)+H2(g)△H+123.9kJ.mol是气体体积增大的吸热反应,升高温度和减小压强,平衡向正反应方向移动,则提高丙烷平衡转化率可采取的措施有升温、降压。(3)根据图像中数据列三段式:C1H4(g)=C3H6(g)+H2(g)起始分压/kPap1变化分压/kPap:-p1pz p1 p2 p最终分压/kPa2p1-p:p2-p1p2-p1则前t。s内C2H4的平均生成速率为P:pkPas-1,TK下该反应的平衡常数为(户2-p1)22p1-p(4)恒压条件下在丙烷蒸气中掺入水蒸气,起减小气体分压的作用,有利于平衡正向移动,可以提高丙烷的平衡转化率(5)逆反应的活化能较大的是催化机理Ⅱ,则正反应的活化能较大的也是墙化机理日,所以反应时间较短的是借化机理1,原因是活化能越大,反应速率越慢,

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)

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