问题 填空题

某混合溶液可能含Na2SO4、Na2CO3、NaCl、NaNO3中的一种或几种溶质,为验证其组成,实验如下:

(1)混合溶液的溶质中一定有                       ,一定没有______________, 可能有                       。

(2)第②步的反应方程式________________________。

(3)如果把第①步所加试剂改为“过量BaCl2溶液”,不能验证的物质是                    ,原因是            

                               

(4)只改变上述三步骤中所用三种试剂的滴加顺序,也可得到同样的验证结论,则这三种试剂滴加的顺序依次为                                                          (填写化学式)

答案

(1)Na2CO3、NaCl;Na2SO4;NaNO3

(2)BaCO3+2HNO3==Ba(NO3)2+H2O+CO2

(3)NaCl;Na2CO3与BaCl2反应生成了NaCl,干扰了对原混合液中NaCl的检验

(4)HNO3、Ba(NO3)2、AgNO3

解答题
阅读理解

阅读下面的短文,并根据短文后的要求答题(请注意问题后的词数要求,并将答案写在二卷答题纸上)。

Paris is the capital of France. It is also one of the most famous cities in the world.

Paris is called “the City of Light”. It is also an international fashion center. What modern women are wearing in Paris will soon be worn by many women in other parts of the world. Paris is also a famous center of education. For example, the headquarters of UNESCO, United Nations Educational, Scientific, and Cultural Organization, is in Paris.

The Seine (塞纳河) divides the city into two parts. Thirty-two bridges cross this scenic river. The oldest and perhaps most well-known is the Pont Neuf, which was built in the sixteenth century. The Sorbonne, a famous university, lies on the left bank of the river. The beautiful white church Sacre Coeur lies on top of the hill called Montmartre on the right bank of the Seine.

There are         in Paris, such as the famous museum, the Louvre, as well as the cathedral of Notre Dame. However, the most famous landmark in this city must be the Eiffel Tower.

Paris is named after a group of people called the Parisii. They built a small village on an island in the middle of the Seine about two thousand years ago. This island, called the lle de la Cite, is where Notre Dame is located. Today around eight million people live in the Paris area.

小题1: What’s the best title for this passage?

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小题2:Which word in the passage can be replaced by “chief office”?

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小题3: Which sentence in the passage can be replaced by the following one?

Paris got its name from a group of people called the Parisii.

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小题4: Please fill in the blank in Paragraph 4 with proper words or phrases to complete the sentence.(Please answer within 10 words.)

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小题5: Translate the underlined sentence in the second paragraph into Chinese.

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