问题 推断题

A~I是初中化学常见的物质,他们之间的相互关系如图所示,(“→”指向生成物.)其中B是红色粉末,A、C常温下是气体,H和I中含有一种相同元素,H不溶于稀硝酸.

请回答下面问题:

(1)物质I的化学式是            ;   物质E的化学式是                   

(2)反应②的基本反应类型是            

(3)物质F属于 碱 (填“酸”、“碱”、“盐”或“氧化物”).

(4)物质C的用途有                                    (写一点即可).

(5)反应①的化学方程式为                                  

答案

(1)Fe(OH)3;H2SO4;(2)复分解反应;(3)碱;(4)灭火(或作气体肥料或化工产品的原料等合理答案);(5)Fe2O3+3CO2Fe+3CO2

题目分析:B是红色粉末,且能与气体A反应生成两种物质,所以B是氧化铁,A是气体故是一氧化碳,两者反应能生成铁和二氧化碳,B能够和E反应,则E应该是酸类物质,由于H不溶于稀硝酸,所以H是氯化银或硫酸钡,H和I中含有一种相同元素,所以含有的相同的元素是氧元素,则H是硫酸钡,I是氢氧化铁,G是硫酸铁,F是氢氧化钡;

(1)由分析知I是Fe(OH)3,E是H2SO4

(2)反应②氧化铁和稀硫酸反应生成硫酸铁和水的反应,该反应属于复分解反应;

(3)F是氢氧化钡,属于碱类物质;

(4)物质C是①的反应生成的二氧化碳,二氧化碳不能支持燃烧,所以可以用来灭火,也可气体肥料或化工产品的原料等;

(5)反应①是一氧化碳和氧化铁生成铁和二氧化碳的反应,方程式为:Fe2O3+3CO2Fe+3CO2

点评:解答这类框图推断题的关键是找好突破口,缩小范围之后根据已推出的作为源头根据题中信息导出其他的物质;同时做推断题还要根据信息敢于大胆假设.

单项选择题
阅读理解

When students and parents are asked to rate subjects according to their importance, the arts are unavoidably at the bottom of the list. Music is nice, people seem to say, but not important. Too often it is viewed as mere entertainment, but certainly not an education priority(优先). This view is shortsighted. In fact, music education is beneficial and important for all students.

Music tells us who we are. Because music is an expression of the beings who create it, it reflects their thinking and values, as well ad the social environment it came influence that George Gershwin and other musicians introduced into their music is obviously American because it came from  American musical traditions. Music expresses our character and values. It gives us identity as a society.

Music provides a kind of perception(感知)that cannot be acquired any other way. Science can explain how the sun rises and sets. The arts explore the emotive(情感的)meaning of the same phenomenon. We need every possible way to discover and respond to our world for one simple but powerful reason: No one way can get it all.

The arts are forms of thought as powerful in what they communicate as mathematical and scientific symbols. They are ways we human beings “talk” to each other. They are the language of civilization through which we express our fears, our curiosities, our hungers, our discoveries, our hopes. The arts are ways we give form to our ideas and imagination so that they can be shared with others. When we do not give children access to an important way of expressing themselves such as music, we take away from them the meanings that music expresses.

Science and technology do not tell us what it means to be human. The arts do. Music is an important way we express human suffering, celebration, the meaning and value of peace and love.

So music education is far more necessary than people seem to realize.

小题1:According to Paragraph 1, students

A.regard music as a way of entertainment

B.disagree with their parents on education

C.view music as an overlooked subject

D.prefer the arts to science小题2:In Paragraph 2, the author uses jazz an example to

A.compare it with rock music

B.show music identifies a society

C.introduce American musical traditions

D.prove music influences people’s lifestyles小题3:According to the passage, the arts and science      .

A. approach the world from different angles

B. explore different phenomena of the world

C express people’s feelings in different ways

D. explain what it means to be human differently

小题4:What is the main idea of the passage?

A.Music education deserves more attention.

B.Music should be of top education priority.

C.Music is an effective communication tool.

D.Music education makes students more imaginative.