问题 选择题

对于平衡体系mA(g)+nB(g)⇌pC(g)+qD(g)△H<0.下列结论中错误的是(  )

A.若温度不变,将容器的体积缩小到原来的一半,此时A的浓度为原来的2.1倍,则m+n<p+q

B.若平衡时,A、B的转化率相等,说明反应开始时,A、B的物质的量之比为m:n

C.若m+n=p+q,则往含有amol气体的平衡体系中再加入amol的B,达到新平衡时,气体的总物质的量等于2a

D.若温度不变时,压强增大到原来的2倍,达到新平衡时,总体积一定比原来的

1
2要小

答案

A、将容器的体积缩小到原来的一半,不考虑平衡移动,此时A的浓度变为原来的2倍,现在A的浓度为原来的2.1倍,说明平衡向着生成A的方向移动了,体积缩小即增大压强,平衡向着气体体积减小的方向进行,所以m+n<p+q,故A正确;

B、反应开始时,A、B的物质的量之比为m:n,恰好等于方程式的系数值比,这种情况下平衡时,A、B的转化率相等,故B正确;

C、往含有amol气体的平衡体系中再加入amol的B,平衡向正反应移动,由于m+n=p+q,达到新平衡时混合气体总的物质的量不变,达到新平衡时气体的总物质的量等于2amol,故C正确;

D、若该反应中,m+n=p+q,温度不变时,压强增大到原来的2倍,平衡不移动,总体积变为原来的

1
2
,故D错误.

故选:D.

单项选择题
阅读理解

第二部分.阅读理解(共25小题。第一节每小题2分,第二节每小题1分;满分45分)

阅读下面五篇短文,从每题后所给的四个选项中选出最佳答案。

The Worst Part

Mom is usually home on Sunday but this week she was going to a big golf game and I was all alone in the house. I was mad at Mom for divorcing Dad.

I kept looking at the telephone until I couldn’t stand it any longer. I picked up the receiver and dialed Dad’s number over in Bakersfield. I even remembered to dial 1 first because it was long distance. “You promised to phone me this week but you didn’t,” I said, feeling I had to talk to him.

“Take it easy, kid,” he said. “I just didn’t get around to it. I was going to call this evening. The week isn’t over yet.”

I thought about that.

“Something on your mind?” he asked.

“I hoped you would call, so I waited and waited.” Then I was sorry I said it.

“There was heavy snow in the morning,” he said, “I had to chain up on highway 80 and lost time.”

I know putting chains on eight big wheels in the snow is no fun. I felt a little better, as long as we were talking. “How is Bandit?” I asked.

There was a funny silence. For a minute I thought the line was dead. Then I knew something must have happened to my dog.

“Well, kid—”, he began. “My name is Leigh!” I almost yelled. “I’m not just some kid you met on the street!”

“Keep your shirt on, Leigh,” he said. “When I had to stop along with some other truckers to put on chains, I left Bandit out of the cab, I thought he would get back … I have sent out a call to CB radio, but I didn’t get an answer yet.” I was about to say I understood when there came the bad part, the really bad part. I heard a boy’s voice say, “Hey, Bill, Mom wants to know when we’re going out to get the pizza?”

41.From the story we know that______ .

       A.Leigh’s dad never had a rest on Sundays    B.Leigh was a deserted boy

       C.Leigh’s dad lived in another city          D.Leigh’s mother often went to golf games

42.What happened to Bandit?

       A.It was frozen to death.    B.It was let out of the cab and got lost

       C.It was killed by a truck.   D.It ran off Highway 80 and into the mountain.

43.The underlined sentence “Keep your shirt on” probably means “ ______ ”.

       A.Listen to reason        B.Stop talking  C.Calm down    D.Keep warm

44.The worst part in Leigh’s eyes may be that______ .

       A.his dad got remarried      B.his parents got divorced

       C.his dad didn’t love him   D.his mom didn’t take him to pizza