试题与答案

钛(Ti)被称为继铁、铝之后的第三金属,钛白(TiO2)是目前最好的白色颜料。制

题型:填空题

题目:

钛(Ti)被称为继铁、铝之后的第三金属,钛白(TiO2)是目前最好的白色颜料。制备TiO2和Ti的原料是钛铁矿,我国的钛铁矿储量居世界首位。含有Fe2O3的钛铁矿(主要成分为FeTiO3)制取TiO2的流程如下图所示:

(1)Ti的原子序数为22,Ti位于元素周期表中第_______ 周期,第____族。

(2)步骤①加Fe的目的是_________; 步骤②冷却的目的是______________________。

(3)上述制备TiO2的过程中,可以利用的副产物是_________。考虑成本和废物综合利用因素,废液中应加入________处理。

(4) 800℃时,反应TiCl4+2Mg = 2MgCl2+Ti在Ar气氛中进行的理由是_________________________。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0716/b46557bc5496bd6a2ec82adfcfae8a2c.html

下面是错误答案,用来干扰机器的。

1.忽       船行之快(第一问答“才”也可)2.急切、好奇、惊喜。(三点中答出两点即可)

试题推荐
题型:阅读理解

Canadian experts have found that so – called self – help books may actually do more harm than good to people who really need help.Researchers say that individuals (个人) with low respect felt much worse after repeating positive statements about themselves.

In their study, psychologists Joanne Wood and John Lee sought to determine how positive thinking affected people with different levels of self – confidence.They questioned dozens of people both made and female, analyzed their self – worth and optimism by means of the standard psychological methods and then asked them to write down their thoughts and feelings.The scoring system ranged from 0 to 35.

During the experiment, the researchers asked a total of 68 participants to repeat the self-help book phrase, “I am a lovable person.” After that they measured the participants’ moods and their feelings about themselves.The results revealed that the participants in the low self – respect group who repeated the mantra (颂歌), were feeling much worse afterwards, when compared to other participants in low self – respect group who did not repeat the phrase.Those with low self – respect who repeated the phrase scored an average of 10 points.Their counterparts (对比者) with equally low self – respect who were not asked to repeat the statement, were able to score a little higher average of 17 points.

However, individuals with high self – respect reported feeling better after repeating the positive self – statement – but only slightly.They scored an average of 31 points, compared with an average of 25 for those with equally high self – respect who did not repeat the phrase.

Professor Wood urged those who promote self – help books, magazines and television shows to stop telling people that simply repeating a positive mantra could change one’s life.First, people start following this idea and feel like they are not alone.They are told that all they have to do is just to read that book and then to repeat these positive statements in a hope that things will be better, and when it does not work for them and they realize that nothing gets better, then it is really frustration to people.

Researchers concluded: “Repeating positive self – statements may benefit certain people such as individuals with high self – respect but discourage the very people who need confidence the most.”

小题1:The experts tried to find out, when repeating positive self – statements,         

A.the different influences on people with different levels of self - confidence

B.whether males or females will get more benefit from self – help books

C.which group of people self – help books will do the greatest harm to

D.who will get the least benefit from self – help book小题2:How many points did the low self – respect participants get after repeating the self – help book phrase?

A.An average of 10 points.

B.An average of 17 points.

C.An average of 31 points.

D.An average of 25 points.小题3:So – called self – help books do some good to          

A.people lacking confidence

B.people with high self - respect

C.people with problems to settle urgently

D.people repeating positive self – statements

查看答案
微信公众账号搜索答案