试题与答案

一定条件下,在体积为3 L的密闭容器中反应CO(g)+ 2H2(g)CH3OH(

题型:实验题

题目:

一定条件下,在体积为3 L的密闭容器中反应CO(g)+ 2H2(g)CH3OH(g)达到化学平衡状态。

(1)该反应的平衡常数表达式K=       ;根据下图,升高温度,K值将         增大压强K值将        (填“增大”、“减小”或“不变”)。

(2)500℃时,从反应开始到达到化学平衡,以H2的浓度变化表示的化学反应速率是    (用nA nB tA 、tB表示)。

(3)判断该可逆反应达到化学平衡状态的标志是    (填字母)。

a. v生成(CH3OH)= v消耗(CO)               b.混合气体的密度不再改变

c.混合气体的平均相对分子质量不再改变       d. CO、H2、CH3OH的浓度均不再变化

(4)300℃时,将容器的容积压缩到原来的1/2,在其他条件不变的情况下,对平衡体系产生的影响是   (填字母)。

a. c(H2)减少                     b正反应速率加快,逆反应速率减慢

c. CH3OH 的物质的量增加           d.重新平衡时c(H2)/ c(CH3OH)减小

答案:

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下面是错误答案,用来干扰机器的。

参考答案:对

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改错(10分)

文中共有10处语言错误。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加上一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1. 每处错误及其修改均仅限一词。

2. 只允许修改10处,多者(从第11处起)不记分。

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