试题与答案

某活动小组利用如图装置验证N0的还原性及探究工业生产硝酸的原理。 如何检查该装

题型:实验题

题目:

某活动小组利用如图装置验证N0的还原性及探究工业生产硝酸的原理。

如何检查该装置气密性                   

(一)向广口瓶①中通入NO并测定NO的体积

(1)通入NO前,向广口瓶①中加入水,让水充满广口瓶①,且调节滴定管③中液面与①相平并记录滴定管③的刻度。

(2)从导管a通入一定量的NO并准确测定通入NO的体积的主要操作:             ;计算出通入的NO的体积为V mL(V<50)。

(二)验证NO的还原性;探究工业生产硝酸的原理

(1)停止通入NO后关闭K1、K3,打开K2,从导管b缓缓通入O2,写出通入O2的过程中发生的化学反应方程式:                            

(2)继续通入O2,打开K3并及时调整滴定管③液面与广口瓶①中液面相平,直到广口瓶①中刚好充满液体。

I.当通入氧气的体积为V/2mL时,则广口瓶①的气体体积为        

II.当广口瓶①的气体体积为V/2 mL时,则通入氧气的体积可能为          

答案:

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题型:阅读理解

阅读理解

     Photographs are everywhere. They decorate(装饰) the walls of homes and are used in stores for sales of different goods. The news is filled with pictures of fires, floods, and special events. Photos record the

beauties of nature. They can also bring things close that are far away. Through photos,people can see wild animals , cities in foreign lands , and even the stars in outer space. Photos also tell stories.

     Reporting the news through photos is called photojoumalism. At times photojournalists tell their stories

through a single picture. At other times,they use a group of pictures to tell a story. Each picture is like a

chapter in a book,which can do more than record the facts. It can also be a strong force for social change.

     Jacob Riis was among the first photojournalists. He took pictures of parts of New York City where the poor lived. Riis believed that poverty (贫穷) caused crime, and he used photos to help him prove his

point. A few years later,the photos of small children working in factories by Lewis  Hine shocked the

public. Hine's pictures helped bring about laws to protect such children.

     Hundreds of pictures may have to be taken in order to get one or two really good photos. It takes

science to have the photo come out clearly and art to make a photo that has a good design and expresses

feeling. Photojournalists make an actual record of what they see. A photo, however,can be both a work of art and an actual record. It can record an important event as a beautiful or exciting picture.

     As historical and artistic documents (文献), photos can become more important  over time. Today

photojoumalists still have their pictures appear in newspapers and magazines. They also publish (发表)

them in books and on the Internet.

1. The underlined word "They"  in the first paragraph refers to _________.   

A. beauties    

B. photos    

C. goods    

D. events

2. The photos of the small children by Hine show us that photos _________.   

A. are also works of art

B. are popular ways of reporting news

C. often shock the public

D. can serve as a force for social change

3. What can we learn from the passage?  

A. News with pictures is encouraging.

B. Photos help people improve their life.

C. News photos mean history in a sense.

D. People prefer reading news with pictures.

4. The text is mainly about _________.   

A. telling the story through pictures

B. decorating the walls of homes

C. publishing historical papers

D. expressing feeling through pictures

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