问题 选择题

对于可逆反应:2SO2(g)+O2(g)2SO3(g) ΔH<0,下图表示SO2的转化率与温度的关系,图上标有A、B、C、D、E五个点,其中能表示反应未达到平衡状态,且正反应速率大于逆反应速率的是(  )

A.A点          B.B、D两点           C.C点         D.E点

答案

答案:C

题目分析:从图像可知B、D两点是平衡点,v(正)=v(逆),C点SO2的转化率比平衡时低,所以平衡要正向移动,v(正)>v(逆),A、E两点SO2的转化率比平衡时高,所以平衡要正向移动,v(正)<v(逆),答案选C。

点评:本题的关键是要根据SO2的转化率判断平衡移动的方向。

阅读理解

Nancy’s hobby is collecting sharpeners. She spends a lot of time on it after school. She has been collecting more than one hundred sharpeners from different countries. They are all different in color and size.

Nancy likes sharpeners with animals and birds on them. In this way, she learns the names of many animals and birds. She also borrows books on animals and birds from her school library. She learns a lot about them from books.

Sometimes Nancy has many sharpeners of the same kind. She gives them to her friends. Then they give her other different sharpeners in return.

Nancy has many pen pals in many countries. She sends them sharpeners of her country. In return, they send her sharpeners of their countries. Nancy’s father also gives her sharpeners. He brings them home from his friends for her.

Many of Nancy’s friends collect other things. Some collect coins and others collect matchboxes(火柴盒)or stamps. But, all of them say that Nancy’s collection is the most interesting of all.

小题1:Nancy spends a lot of time on her hobby             .

A.before school

B.in class

C.after school

D.during her holidays小题2:          Nancy’s sharpeners are different in color and size.

A.All of

B.Some of

C.Many of

D.Most of小题3:Sometimes Nancy has many sharpeners of the same kind. She then           .

A.keeps them

B.throws them away

C.sells them

D.sends them to her friends小题4:What don’t Nancy’s friends collect?

A. Sharpeners.   B. Coins.    C. Matchboxes and stamps.  D. Both B and C.

小题5:How does Nancy collect sharpeners? Which of the following is wrong?

A.Her friends give her some.

B.Her pen pals send her some.

C.Her father buys her some.

D.Her father’s friends give her some.

单项选择题