2022英语周报九年级Z第28期答案

【参考范文】One day, Spotty returned from his daily walk with a broken leg. Appearing exhausted, he came to myroom and sat near me, the leg bleeding. I called my mother and she quickly tied a bandage around his leg andgave him food to eat. I was very upset. But the next day, Spotty followed me wherever I went happily asusual though he limped a bit. After this incident my relation with Spotty became more intense. I reallyadmired him a lot for his courageAlmost a year later, one midnight we heard Spotty barking breathlessly. We rushed out and saw himbarking continuously, heading somewhere. After some time Spotty became quiet. I patted him on his backand came inside. The next morning, my heart skipped a beat when I didn't see Spotty. I searched for him ineach and every corner but in vain. And this time he had gone and would never come back. I cried and waitedfor him. But there were no signs of him and I only say him looking at me with his sparking eyes in my dream

20.(11分)(1)-12.6kJ·mol11分)(2)过渡态Ⅱ(1分)该步反应的活化能(或能垒或需要吸收的能量)大(1分)<(1分)(3)①N(1分)②2(1分)p2(p2-p1)分)22)(地pe22)④增大(1分)温度升高压强增大;温度升高反应和反应‖均正向移动,HCl的百分含量增大,分压增大(2分)【解析】(1)根据盖斯定律可知,△H=-1944.6kJ·mol1+(-285.8kJ·mol-1)(-2217.8k·mol-1)=-12.6kJ·mol-1。(2)由图可知,过渡态中对反应速率影响较大的是过渡态Ⅱ,理由为该步反应的活化能(或能垒或需要吸收的能量)大;整个过程最终能量降低,故应热(△H)<0。(3)①反应过程中CH3 CHCICH3的变化量比HCl低,故图中代表CH3 CHCICH2分压变化的曲线为N②0~ts内,反应的平均反应速率v(CH2 CHCICH3)=kPa·s-l。③反应前总压强为pkPa,则C3H和Cl2的分压均为2。kPa,平衡时CH3 CHCICH3和HC1的分压分别为p1kPa、p2kPa,故平衡时CH8、Cl2、CHCH2CH2Cl、HCl的分压分别为(2-p2)kPa、(222)kPa、(2-p1)kPa、p2kPa,故该温度下,加2(加2=力)反应的平衡常数K(-t2)("22-p2④若适当升高温度,HC的平衡分压会增大,理由为温度升高压强增大;温度升高反应i和反应‖均正向移动,HC的百分含量增大,分压增大。

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