问题 填空题

(7分)金属在生产和生活中具有广泛的应用。(1)下列金属制品的用途中,利用金属导热性的是   (填字母序号)。

A.铁锅   B.铜导线    C.铝箔

(2)人类每年从自然界提取大量的金属,其中提取量最大的是铁。赤铁矿(主要成分为Fe2O3)和一氧化碳炼铁的化学方程式为                                

(3)铁制品容易锈蚀,铁生锈的条件是                     

(4)某工厂废液中含有氯化钠、氯化铜和氯化亚铁。某课外小组利用废液制取海绵铜(Cu)和氧化铁两种产品,过程如下图所示(过程中不引入其他元素)。请回答下列问题:

①溶液D中的溶质为              

②检验C过量的方法是                            

③A~G七种物质中含铁元素的物质有     (填字母序号)。

答案

(1)A(2)3CO+Fe2O33CO2+2Fe(3)与氧气、水接触 (4)①NaCl、FeCl2②取少量溶液E于试管中,加入锌粉,若有气泡冒出,则加入的C过量,反之,则C 不过量。(需写出操作,现象,结论) ③ABDEG

 

题目分析:(1)利用金属导热性的是A铁锅;(2)赤铁矿(主要成分为Fe2O3)和一氧化碳炼铁的化学方程式为3CO+Fe2O33CO2+2Fe;(3)铁制品容易锈蚀,铁生锈的条件是与氧气、水接触;根据题的叙述要求及转化图可知,加入过量的A为金属铁,①溶液D中的溶质为氯化钠和氯化亚铁;②检验C过量的方法是过量的C是把过量的铁转化为溶液E,故C物质为盐酸,故根据酸的性质取少量溶液E于试管中,加入锌粉,若有气泡冒出,则加入的C过量,反之,则C 不过量,③A~G七种物质中含铁元素的物质有ABDEG

完形填空

阅读短文,根据要求完成下面各小题。

In a classroom in any countries , the teachers teaches more than art or history or language. He or she teaches something behind---the culture of the country.

In a country such as the United States, people with different history, culture and language join together and the pay much attention to personal ideas. Teachers try to make each student special. Students do not have to remember a lot of information , instead, they work and find answers by themselves. There is often discussion in the classroom..

At an early age students learn to have their own ideas. Their education encourages personal thought.

The importance is placed on how to arrive at an answer and not only to get the correct answer.  

In most Asian countries , people have the same language , history and culture. Perhaps for this reason , the education there pays more attention to group goals than person ideas. Children in China and Japan often work together and help each other on homework. In the classroom, the ways of teaching are often very traditional. The teachers says , and the students listen. There is not much discussion. Instead , the students repeat rules or information that they have been taught in order to keep them in mind .

In many ways these differences come from different educational ideas. In western countries teachers are taught to help students to learn. They make it easier for the students to learn by themselves. In some Asian countries , however , teachers often feel that their job is to pass knowledge to students.

A: 根据短文内容简要回答问题。

小题1: What does the education in the United States encourage ?

________________________________________________

小题2: Which does the education in some Asian countries pay more attention to, group goals or personal ideas?

__________________________________________________

B: 将短文中画线的句子译成汉语。

小题3:___________________________________________________________________

小题4: ________________________________________________________________

小题5: 请给短文拟一个恰当的标题。

___________________________________________________

判断题