问题 填空题

右图所示为A、B、C、D、E几种物质间的转化关系:

(1)如果B、C是常见的碱,A、D是常见的盐,E是一种常见的无色无味的气体.则:

①物质的化学式:E______;

②A与C反应的化学方程式:______;

该反应的基本类型属于______;

(2)如果B、C是固体单质,A、D是氧化物,E是一种常见的无色无味的气体,且A中含有血红蛋白组成不可缺少的元素.则:

①物质的名称:A______;

②A与C的氧化物反应的化学方程式:______.

答案

(1)如果B、C是常见的碱,A、D是常见的盐,E是一种常见的无色无味的气体,则E可能是二氧化碳,A、D属于碳酸盐,A和C能转化生成B和D,则A可能是碳酸钠,C可能是氢氧化钙,B是氢氧化钠,D是碳酸钙,代入框图,推断合理,故填:

①CO2

②Na2CO3+Ca(OH)2=Ca CO3↓+2NaOH,复分解反应.

(2)如果B、C是固体单质,A、D是氧化物,E是一种常见的无色无味的气体,且A中含有血红蛋白组成不可缺少的元素,则A中含有铁元素,B能与气体单质E反应生成A,则A可能是四氧化三铁,E可能是氧气,B是铁,A能与C反应生成铁和D,则C可能是一氧化碳,D可能是碳,带入框图,推断合理,故填:

①四氧化三铁;

②Fe3O4+4CO

 高温 
.
 
3Fe+4CO2

阅读理解

A study of a university in Shanghai had found that many of the students there are using a quote(引语)from the Italian poet Dante as a kind of motto.The study of Fudan University, one of China’s top universities, of 489 students, found that 82 had chosen Dante’s “Follow your own path and don’t worry about what others say” as their motto, out of 278 people who said they had a motto.This was followed by “Believe yourself” and “Self-improvement without stop.”

Students also expressed a common hope for greater understanding and care and said they were always ready to give a hand to those in need.

Some researchers think that mottoes can play an important part in children’s growth and they say that a good motto can help children develop a better character.

小题1:The study shows _________.

A.which university should have mottoes

B.what poems are popular

C.how many students like the motto “Believe yourself.”

D.the majority of the students like to choose their favorite mottoes小题2:Of the students asked, _______ students have mottoes.

A.about 78%

B.about 57%

C.about 16%

D.about 8%小题3:The motto “Self-improvement without stop” shares the similar meaning with ______.

A.going on to improve rapidly

B.growing by oneself continuously

C.making oneself better and perfect continuously

D.becoming better without having a break小题4:The best title for the passage should be _______.

A.Mottoes and Character Developing

B.Students and Poet

C.Mottoes and Learning

D.Understanding Care

填空题