问题 选择题

在一定条件下,可逆反应N2(g)+2H2(g)⇌2NH3(g)△H<0达到平衡,当单独改变下列条件后,有关叙述错误的是(  )

A.加催化剂,v、v都发生变化,且变化的倍数相等

B.加入氩气,v、v都增大,且v增大的倍数大于v增大的倍数

C.加压,v、v都增大,且v增大的倍数大于v增大的倍数

D.降温,v、v都减小,且v减小的倍数小于v减小的倍数

答案

A.催化剂能同等程度的改变正逆反应速率,故A正确;

B.加入氩气,容器的压强增大,但反应物和生成物的浓度都不改变,所以正逆反应速率都不变,故B错误;

C.增大压强,正逆反应速率都增大,但v增大的倍数大于v增大的倍数,则平衡向正反应方向移动,故C正确;

D.降低温度,正逆反应速率都减小,但正反应速率减小的倍数小于v减小的倍数,则平衡向正反应方向移动,故D正确;

故选B.

阅读理解

阅读理解。

    Now QQ coins are popular among Chinese teenagers. People use real money to buy Web money. Then

they buy clothes for their online characters or services for their online pets with it. And these fancy things

will cost QQ fans more in the future.

    The government will put a tax (税) of 3% on online sales. For example, if QQ users pay 100 yuan for

110 QQ coins, they will have to spend 103 yuan in the future. The extra three yuan is tax.

    Beijing was the first city to carry out the policy (政策). Online games have to pay the tax, too. A number

of players make money by spending a lot of time on the games to gain (获得) powers, and then selling them

online.

    Experts said that online trade grew fast. There is more than 10 billion yuan of real money in online trade

a year in China.

    However, the government's new move has become a hot topic among Internet users around the country.

In a survey by sina.com, more than 70% of about 3,000 surveyed were against it. They said that the tax is

too heavy.

    But supporters said the government's better management (管理) of the Internet would help it become

healthier. They believe the new move would help stop online identity (身份) theft.

1. We can learn from the passage that QQ coins are _____. [ ]

A. a kind of game software

B. a kind of Web money

C. some fancy clothes

D. some online pets

2. The Chinese government will put a tax of _____ on online sales. [ ]

A. 3%

B. 10%

C. 11%

D. 15%

3. Which city was the first to carry out the policy? [ ]

A. Shanghai.

B. Beijing.

C. Guangzhou.

D. Shenyang.

4. The underlined word "move" means "_____" in Chinese. [ ]

A. 移动

B. 搬家

C. 措施

D. 迁移

5. We can learn from the passage that _____. [ ]

A. the players don't have to pay the tax

B. many Internet users think the tax is too heavy

C. only 20% of about 3,000 Internet users are against this policy

D. the new move will cause online identity theft

判断题