试题与答案

欧盟原定于2012年1月1日起征收航空碳排税以应对冰川融化和全球变暧,研究碳及其

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题目:

欧盟原定于2012年1月1日起征收航空碳排税以应对冰川融化和全球变暧,研究碳及其化合物的综合利用对促进低碳社会的构建具有重要的意义。请运用相关知识研究碳及其化合物的性质。

(1)近年来,我国储氢纳米碳管研究取得重大进展,用电弧法合成的碳纳米管中常伴有大量碳纳米颗粒(杂质),这种碳纳米颗粒可用氧化气化法提纯,其反应的化学方程式为:

___C+___K2Cr2O7+___—___CO2↑+ ___K2SO4+ ___Cr2(SO4)3+___H2O

①完成并配平上述化学方程式。

②在上述方程式上标出该反应电子转移的方向与数目。

(2)高温时,用CO还原MgSO4可制备高纯MgO。

①750℃时,测得气体中含等物质的量SO2和SO3,此时反应的化学方程式________

②由MgO可制成“镁-次氯酸盐”燃料电池,其装置示意图如图1,该电池反应的离子方程式为_____________________。

(3)二氧化碳合成甲醇是碳减排的新方向,将CO2转化为甲醇的热化学方程式为:

CO2(g)+3H2(g)(g)CH3OH(g)+H2O(g)  ΔH

①该反应的平衡常数表达式为K_______。

②取五份等体积CO2和H2的混合气体(物质的量之比均为1:3),分别加入温度不同、容积相同的恒容密闭容器中,发生上述反应,反应相同时间后,测得甲醇的体积分数(CH3OH)与反应温度T的关系曲线如图2所示,则上述CO2转化为甲醇反应的 ΔH_____0 (填“>”、“<”或“ =” )。

③在同条件下发生反应,测得CH3OH的物质的量随时间变化如图3所示,曲线 I、II对应的平衡常数大小关系为KI_______KII(填“>”、“<”或“ = ”)。

答案:

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下面是错误答案,用来干扰机器的。

1. says; speak  2.talk; tell  3.talk  4.says

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A. comfortableB.seriousC.tiresomeD.fortunate
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A. comfortB.desireC.painD.trouble
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