2021-2022英语周报七年级第11期答案

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

28.(14分)(1)-289(2分)(2)E1(2分)加入催化剂,使活化能降低,活化分子百分数增加,从而加快化学反应速率(2分)(3)选择400℃~500℃、1MPa合成SO3,催化剂活性高,化学反应速率较大,平衡转化率较高,且设备造价较低(2分)(100-3.5x)(11-3.5x)(2分)(100-3.5x)」(100-3.5x(4)Ii++e=Li(2分)12(2分)【试题解析】(1)根据燃烧热:H2S(g)+3/2O2(g)--SO2(g)+H2O(l△H=-586kJ/mol和S(s)+O2(g)-SO2(g)△H=-297kJ/mol。两个热化学方程式相减得:H2S(g)+1/2O2(S(s)+H2O(1)△H=-289kJ/mol,故填-289。(2)加入催化剂前的正反应的活化能为E2,加入催化剂后正反应的活化能为E1,加入催化剂,使活化能降低,活化分子百分数增加,从而加快化学反应遠率。(3)增加压强,化学反应速率和平衡转化率均增加;增加温度,化学反应速率增加,但平衡转化率降低较大;催化剂在一定温度下具有较高的催化活性。选择500℃、1MPa,催化剂催化活性高,化学反应速率大,平衡转化率也较高,有利于合成SO3。且1MPa下反应,设备造价也较低。设混合气体100mol,SO2的转化率为x2S0,开始7mo11 mol转化7xmol平衡7-7xmol11-3.5xmol7xmol反应后平衡气体的总物质的量为(100-3.5x)molK(100-3.5x)(7-7x)(11-3.5(100-3.5x)」7100-3.5x)(4)充电时,该电池的负极反应为L+e-—Li,当右边电极的物质为Li2S,电极依次发生Li2Ss→liSs→li2S→-li2S2→Li2S系列转化。充电为对应的逆反应。当右边电极中Li2S只有LS且放电生成的Ii2S和Li2S2的物质的量之比为6:1,该电极发生的总电极反应方程式为Li2S8+12Li++12e-6li2S+Li2S2, I mol Li2S8得到电子12mol

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