精英家教网 > 高中地理 > 题目详情

【题目】甲、乙、丙三溶液各含有一种X(X为Cl、Br或I),向甲中加入淀粉溶液和氯水,则溶液变为橙色,再加丙溶液,颜色无明显变化。则甲、乙、丙依次含有( )

A.Br、I、Cl B.Br、Cl、I

C.I、Br、Cl D.Cl、I、Br

【答案】A

【解析】[向甲中加入淀粉溶液和氯水,溶液变为橙色,应是溴水的颜色,则甲中必含有Br,被Cl2置换生成了Br2,由此否定了C、D;再加丙溶液,颜色无明显变化,说明丙溶液中不含I,否则加入后应被Br2所置换,生成I2,溶液应为蓝色,与题给条件不符,则丙溶液只能含有Cl,I必在乙溶液中。因此甲、乙、丙溶液依次含有Br、I、Cl。]

练习册系列答案
相关习题

科目:高中地理 来源: 题型:

【题目】 --- I'm going to San Francisco for a couple of days.

--- I wish I could get away for a while.

A. It doesn't matter

B. Forget it

C. I really envy you

D. I can't agree more

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】阅读下面材料,在空白处填入1个适当的单词或括号内单词的正确形式。

In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear 1 spoken. Secondly, we must be able to speak it correctly with confidence and without hesitation. 2 (three), we must be able to read the language, and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.

There is no easy way to success 3 language learning. 4 good memory is of great help, but it is not enough only 5 (memorize) rules from a grammar book. It is not much use learning by heart long a list of words and 6 (they) meaning, studying the dictionary and so on. We must learn by using the language. If we __7__ (satisfy) with only a few rules we have memorized, we are not really learning the language. "Learn through use" is a good piece of 8 (advise) for those 9 are studying a new language. Practice is important. We must practice speaking and 10 (write) the language whenever we can.

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】 It was announced that only when the fire was under control ________to return to their homes.

A. the residents would be permitted

B. had the residents been permitted

C. would the residents be permitted

D. the residents had been permitted

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】完成句子

1. No sooner ____________________ than it began to rain.

我刚一到家天就开始下雨了。

2. Out ____________________, who won the first place in the race.

这位在比赛中获得一等奖的运动员冲出去了。

3. ________________, he knows much. (as)

尽管他年轻,但懂得很多。

4. Only after the doctor gave the patient anesthesia _________________________. (perform)

只有在医生给病人施行麻醉以后,手术才能进行。

5. ___________________________ that even people in the next room could hear him.

他说话的声音如此大以至于隔壁屋里的人都能听见。

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】艾滋病是HIV感染所引起的人类免疫缺陷疾病。下列有关艾滋病的叙述,正确的是

A.HIV主要通过感染人体B淋巴细胞,从而影响体液免疫

B.艾滋病人群患恶性肿瘤的比率与健康人相比没有差异

C.HIV在繁殖过程中,利用其RNA和宿主的翻译系统合成病毒自身的蛋白质

D.正常人与艾滋病患者一起就餐会感染艾滋病

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】听一段材料,回答下面几个小题。

【1】What is the woman doing now?

A.She is serving a customer.

B.She is conducting an interview.

C.She is doing some recording.

【2】When does the man go to the nursing home?

A.Tuesdays. B.Thursdays. C.Sundays.

【3】Where will the man probably be working next Monday?

A.At the airport nearby.

B.In the studio next door.

C.At the store downtown.

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】翻译与仿写

1. In the farmyards, the chickens and even the pigs were too nervous to eat.

翻译:

________________________________________________________________________

仿写:活到老,学到老。

It is never ________________________________.

2. It seemed as if the world was at an end!

翻译:

________________________________________________________________________

仿写:他们谈起话来就像多年的老朋友。

They talked __________________________________ friends for years.

3. Thousands of families were killed and many children were left without parents.

翻译:

________________________________________________________________________

仿写:让他们待在地上吧。

________________ on the ground.

4. Everywhere they looked nearly everything was destroyed.

翻译:

________________________________________________________________________

仿写:她不管去哪里都拎着手袋。

She takes her handbag ________________________.

5. All hope was not lost.

翻译:

________________________________________________________________________

仿写:并不是所有的学生都能懂得这个。

________________________ understand this.

查看答案和解析>>

科目:高中地理 来源: 题型:

【题目】D

An international study of more than 13, 000 adults found that many people say modern technology has affected relations with their partners. Almost 40 percent of those questioned said their partners paid more attention to their mobile devices than to them.

The research included both old and new relationships. Thirty-three percent of those asked reported that they had to compete against a mobile device for attention on a first date.

Apparently, we have as much love for our digital devices as for the people we love. The survey found that adults spend almost equal amounts of time online at home as they do interacting directly. And a lot of married couples, friends and family members argue about time spent on mobile devices.

Rules or time limits on a device might be good, in theory. However, the survey found that 45 percent of those questioned do not set rules. Another 45 percent said they got into arguments about how much they are on their phones when spending time with loved ones. The lack of social rules about digital behavior might be the result of the newness of the issue.

Past generations did not have the technologies. In this situation, our elders know nothing. In fact, the knowledge and ability is moving towards the youngest generation thats using the technology because theyre the ones bounding forward fearlessly, and finding out what ways they can get in trouble.

That trouble may include the sharing of sensitive information. The research found nearly 30 percent of couples share passwords to social media sites. This could be a problem when relationships end.

The study advises that people step away from electronic devices to truly connect with other people. Understand the value of distancing yourself from your device and allow yourself to be engaged with that person that means the most to you.

【1】What did the study find about modern technology?

A. People depend too much on it.

B. It breaks relations between partners.

C. Partners need it to develop relations.

D. It has a bad effect on human relations.

【2】Whats the problem with the digital device?

A. It takes up too much time.

B. It is dangerous to play.

C. It causes tiredness in married couples.

D. It takes away all love from loved ones.

【3】 What can be inferred from Paragraph 4?

A. People disagree with limiting mobile use.

B. Rules need to be made to limit mobile use.

C. The majority of users set rules to use a device.

D. More and more people will use phones wisely.

【4】What can be the best title for the text?

A. We Cant Live Without a Cell Phone.

B. For Love, Put Aside the Phone!

C. How Powerful Electronic Devices Are!

D. Your Time Will Be Killed by the Phone.

查看答案和解析>>

同步练习册答案