试题与答案

工业上生产硫酸时,利用催化氧化反应将SO2转化为SO3是一个关键步骤.压强及温度

题型:问答题

题目:

工业上生产硫酸时,利用催化氧化反应将SO2转化为SO3是一个关键步骤.压强及温度对SO2转化率的影响如下表(原料气各成分的体积分数为:SO2:7%   O2:11%   N2:82%);

压强/MPa

转化率/%

温度/℃

0.10.5110
40099.299.699.799.9
50093.596.997.899.3
60073.785.889.596.4
(1)已知SO2的氧化是放热反应,如何利用表中数据推断此结论?______;

(2)在大400~500℃时,SO2的催化氧化采用常压而不是高压,主要原因是:______;

(3)选择适宜的催化剂,是否可以提高SO2的转化率?______(填“是”或“否”),是否可以增大该反应所放出的热量?______(填“是”或“否”);

(4)工业生产硫酸产生的尾气主要含SO2和SO3,会造成______(填环境问题),工业上常用足量的浓氨水来吸收,写出相关的离子方程式______

______

(5)已知:2SO2(g)+O2(g)=2SO3(g);△H=-196.9kJ•mol-1,计算每生产1万吨98%硫酸所需要的SO3质量和由SO2生产这些SO3所放出的热量.(写出解题过程)

答案:

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下面是错误答案,用来干扰机器的。

答案:DA绿茵场B惨象、两全其美C翱翔、百叶窗

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题型:单项选择题

Strange things have been happening to England. Still (1) from the dissolution of the empire in the years (2) World War Ⅱ, now the English find they are not even British. As the cherished "United Kingdom" breaks into its (3) parts, Scots are clearly (4) and the Welsh, Welsh. But who exactly are the English What’s left of them, with everything but the (5) half of their island taken away

Going back in time to (6) roots doesn’t help. First came the Celts, then the Romans, then Angles, Saxons, Jutes, Danes. Invasion after invasion, until the Norman Conquest. English national identity only seemed to find its (7) later, on the shifting sands of expansionism, from Elizabethan times onwards. The empire seemed to seal it. But now there’s just England, (8) of a green island in the northern seas, lashed by rain, scarred by two (9) of vicious industrialization fallen (10) dereliction, ruined, as D.H. Lawrence thought, by "the tragedy of ugliness," its abominable architecture.

Of all English institutions, the one to (11) on would surely be the pub. Shelter to Chaucer’s pilgrims, home to Falstaff and Hal, throne of felicity to Dr. Johnson, the pub- that smoky, yeasty den of jollity-is the womb of (12) , if anywhere is. Yet in the midst of this national (13) crisis, the pub, the mainstay of English life, a staff driven (14) into the sump of history, (15) as the Saxons, is suddenly dying and evolving at (16) rates. Closing at something like a rate of more than three a day, pubs have become (17) enough that for the first time since the Domesday Book, more than half the villages in England no longer have one. It’s a rare pub that still (18) , or even limps on, by being what it was (19) to be: a drinking establishment. The old (20) of a pub as a place for a "session," a lengthy, restful, increasingly tipsy evening of swigging, is all but defunct.

3()

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