问题 填空题

(1)下图为某学生设计的探究可燃物燃烧条件的实验,请回答:

①反应中观察到的现象是_____________。

②该实验设计的特点有_____________ 。

③待发生燃烧反应的试管冷却后,小明将试管倒立在水槽里的水中,捏住气球口部,小心取下气球,观察到试管中的现象是____________,产生此现象的原因是_________ 。

(2)下图所示是一种氮肥的包装标签。请回答下列问题(以下计算结果均保留至0.1%):

①碳酸氢铵中氮元素的质量分数是_______________。

②这种氮肥的纯度(即化肥中碳酸氢铵的质量分数)是_____________。

答案

(1)①试管A中的白磷燃烧,发光放热,产生白烟,气球先变大后变小;烧杯里水中的白磷熔化;红磷没有变化

②保护环境

③试管中液面上升至试管容积约1/5处 ;白磷燃烧消耗氧气,生成固体,使瓶内气体减少,气体压强减小,小于外界大气压,又因为O2约占空气总体积的1/5,所以大气压将水槽的水压入占试管容积1/5处

(2)①17. 7% ;②94.9%

单项选择题
阅读理解

Garden building is considered an important part of Chinese culture. Some people say that if you have never walked through a Chinese garden, you cannot say that you have really visited China.

Traditional Chinese gardens are located in North China in such places as Beihai Park, the Summer Palace, the Forbidden City. In larger imperial gardens, the main buildings are connected by an imaginary(虚构的) line in the middle of the garden on the north-south axis(轴). Other features of imperial gardens are colored-paintings, man-made hills and lakes.

Most private gardens are found in the south, especially in cities south of the Yangtze River. Private gardens were mostly built at one side or at the back of the houses. Around the beautiful scene are small open areas with beautiful shaped-doors through which visitors can enjoy the sights. They are open on all sides and are often near the water so that the whole scene can be enjoyed. Suzhou, known as the home of gardens, displays the most and the best Chinese traditional private gardens. Different parts of it are examples of the garden style of the Song, Yuan, Ming and Qing Dynasties.[

The landscape(自然风景) garden contains a number of pleasant natural scenes and some fairy tales. The ancient Chinese used to call the garden landscape “Jing” , which means “scene” in English. Good examples include the ten West Lake Scenes in Hangzhou, the twenty-four slim West Lake in Yangzhou and the eight Daming Lake Scenes in Jinan.

小题1: The passage tells mainly about ________.

A.an important part of Chinese culture

B.how to enjoy Chinese gardens

C.where foreigners can find Chinese gardens

D.the characters of different style of Chinese garden building小题2:Which of the following is NOT true for the imperial garden?

A.There is a north-south axis in the center of garden

B.They were built because of some fairy tales.

C.There are man-made hills and lakes in the gardens.

D.They have colored-paintings.小题3:According to the passage, we can learn that _______.

A.Chinese people often invite foreigners to visit a Chinese garden.

B.The landscape garden reflects different styles of the Song, Yuan, Ming and Qing Dynasties.

C.All three kinds of gardens make up the important part of Chinese culture which is appreciated by the people all over the world.

D.People enjoy the private gardens more than other two styles.