Khi Trùng Ngưng Axit ε-aminocaproic Ta Thu được M Gam Polime Và 1 ...

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Câu hỏi Hóa học

Khi trùng ngưng axit ε-aminocaproic ta thu được m gam polime và 1,35 gam H2O. Giá trị m là:

A.

8,475.

B.

9,825.

C.

16,950.

D.

5,425.

Đáp án và lời giải Đáp án:A Lời giải:

8,475.

Câu hỏi thuộc đề thi sau. Bạn có muốn thi thử?

Bài tập trắc nghiệm Chương 4 Polime Và Vật Liệu Polime - hóa học 12 có lời giải - 40 phút - Đề số 4

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Một số câu hỏi khác cùng bài thi.

• Khi trùng ngưng axit ε-aminocaproic ta thu được m gam polime và 1,35 gam H2O. Giá trị m là:

• Thủy tinh hữu cơ poli(metyl metacrilat) được tổng hợp theo sơ đồ chuyển hoá và hiệu suất mỗi giai đoạn như sau:

  Axit metacrilic Metyl metacrilat Poli(metyl metacrilat).

  Muốn tổng hợp 1,0 tấn thủy tinh hữu cơ thì cần dùng bao nhiêu tấn axit metacrilic 80%?

• Khi trùng hợp vinyl clorua ở điều kiện áp suất cao, người ta thu được poli vinyl clorua (PVC) có khối lượng phân tử trung bình bằng 750000 đvC. Hệ số trùng hợp là:

• Hai chất nào dưới đây tham gia phản ứng trùng ngưng với nhau tạo tơ nilon-6,6?

• Người ta có thể điều chế cao su buna từ gỗ theo sơ đồ các quá trình chuyển hoá và hiệu suất giả thiết như sau:

  Gỗ glucozơ rượu etylic butađien-1,3 cao su buna

  Biết rằng gỗ chứa 75% xenlulozơ. Khối lượng gỗ cần được sản xuất 1 tấn cao su là:

• Đồng trùng hợp buta-1,3-đien với acrilonitrin (CH2=CH-CN) được một loại cao su Buna-N chứa 8,696% khối lượng nitơ. Tỉ lệ số mắt xích butađien và acrilonitrin có trong loại cao su trên là:

• Khi đốt cháy polime X chỉ thu được khí cacbonic và hơi nước theo tỉ lệ số mol tương ứng là 1 : 1. X là polime nào trong số các polime sau đây?

• Trong số các polime sau đây: (1) sợi bông; (2) tơ tằm; (3) len; (4) tơ visco; (5) tơ enang; (6) tơ axetat; (7) nilon-6,6. Loại có nguồn gốc xenlulozơ là:

• Một loại polime rất bền với nhiệt và axit, được tráng lên "chảo chống dính" là polime có tên gọi nào sau đây?

• Polime X chứa 38,4% C, 4,8% H, còn lại là Cl về khối lượng. Công thức của X là:

• Trùng ngưng 8,9 gam alanin thu được m gam một polime và 1,62 gam H2O. Số mắt xích -NH-CH(CH3)-CO- trong m gam polime trên là:

• Trùng hợp hiđrocacbon nào sau đây tạo ra polime dùng để sản xuất cao su buna?

• Tơ được sản xuất từ xenlulozơ là:

• Có các loại tơ sợi sau:

  (1) Tơ capron.

  (2) Tơ tằm.

  (3) Tơ xenlulozơ axetat.

  (4) Tơ visco.

  (5) Tơ enang.

  (6) Tơ nilon-6,6.

  (7) Tơ lapsan.

  (8) Tơ nitron.

  Tơ poliamit là:

• Đốt cháy 1 lít hiđrocacbon X cần 6 lít O2 tạo ra 4 lít khí CO2. Nếu đem trùng hợp tất cả các đồng phân cấu tạo mạch hở của X thì số loại polime thu được là:

• Poli (metyl metacrylat) và nilon-6 được tạo thành từ các monome tương ứng là:

• Xét các phản ứng:

  (a) A B + C

  (b) B + H2O D

  (c) D E↑ + F↑ + H2O

  (d) A E↑ + F↑

  (e) E cao su buna

  (f) B + F C

  Chất A trong dãy này là:

• Trong các chất sau : etan, propen, benzen, glyxin, stiren. Chất nào cho được phản ứng trùng hợp để tạo ra được polime ?

• Cho dãy các chất: CH2=CHCl, CH2=CH2, CH2=CH-CH=CH2, H2NCH2COOH. Số chất trong dãy có khả năng tham gia phản ứng trùng hợp là

• Cho các sơ đồ phản ứng sau:

  (1) CH2=C(CH3)-CH=CH2 Polime

  (2) CH2=CH-CH3 + C6H5-CH=CH2 Polime

  (3) CH2=CH2 (-CH2-CH2-)n

  (4) H2N-(CH2)10-COOH H2O + polime

  Các sơ đồ phản ứng trùng ngưng là:

Một số câu hỏi khác có thể bạn quan tâm.

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

    It’s often said that we learn things at the wrong time. University students frequently do the minimum of work because they’re crazy about a good social life instead. Children often scream before their piano practice because it’s so boring. They have to be given gold stars and medals to be persuaded to swim, or have to be bribed to take exams. But the story is different when you’re older.

    Over the years, I’ve done my share of adult learning. At 30,1 went to a college and did courses in History and English. It was an amazing experience. For starters, I was paying, so there was no reason to be late - I was the one frowning and drumming my fingers if the tutor was late, not the other way round. Indeed, if I could persuade him to linger for an extra five minutes, it was a bonus, not a nuisance. I wasn’t frightened to ask questions, and homework was a pleasure not a pain. When I passed an exam, I had passed it for me and me alone, not for my parents or my teachers. The satisfaction I got was entirely personal.

    Some people fear going back to school because they worry that their brains have got rusty. But the joy is that, although some parts have rusted up, your brain has learnt all kinds of other things since you were young. It has learnt to think independently and flexibly and is much better at relating one thing to another. What you lose in the rust department, you gain in the maturity department.

    In some ways, age is a positive plus. For instance, when you’re older, you get less frustrated. Experience has told you that, if you’re calm and simply do something carefully again and again, eventually you’ll get the hang of it. The confidence you have in other areas - from being able to drive a car, perhaps - means that if you can’t, say, build a chair instantly, you don’t, like a child, want to destroy your first pathetic attempts. Maturity tells you that you will, with application, eventually get there.

            I hated piano lessons at school, but I was good at music. And coming back to it, with a teacher who could explain why certain exercises were useful and with musical concepts that, at the age of ten, I could never grasp, was magical. Initially, I did feel a bit strange, thumping out a piece that I’d played for my school exams, with just as little comprehension of what the composer intended as I’d had all those years before. But soon, complex emotions that I never knew poured out from my fingers, and suddenly I could understand why practice makes perfect.

  It is implied in paragraph 1 that __________.

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

  How might volunteering contribute to lower blood pressure? Performing volunteer work could increase physical activity among people who aren’t otherwise very active, says lead study author Rodlescia Sneed, a doctoral candidate in social and health psychology at Carnegie Mellon University. It may also reduce stress. “Many people find volunteer work to be helpful with respect to stress reduction, and we know that stress is very strongly linked to health outcomes,” she says. As with any activity thought to improve health, researchers are trying to identify the specific characteristics of volunteering that provide the greatest benefit. For example, how much time would you need to put into volunteer work to lower your blood pressure or live longer? In the Carnegie Mellon study, 200 hours of volunteering per year correlated to lower blood pressure. Other studies have found a health benefit from as little as 100 hours of volunteering a year. Which types of volunteer activities improve health the most? No one really knows. Sneed speculates that mentally stimulating activities, like tutoring or reading, might be helpful for maintaining memory and thinking skills, while “activities that promote physical activity would be helpful with respect to cardiovascular health, but no studies have really explored this.” One key for deriving health benefits from volunteering is to do it for the right reasons. A 2012 study in the journal Health Psychology found that participants who volunteered with some regularity lived longer, but only if their intentions were truly altruistic. In other words, they had to be volunteering to help others not to make them selves feel better.

  The Greek philosopher Aristotle once surmised that the essence of life is “To serve others and do good.” If recent research is any indication, serving others might also be the essence of good health.

  The word “altruistic” in paragraph 3 is closest in meaning to_____

• People _________ fast food like chips and humburgers 300 years ago.

• Hardly did he enter the room when all the lights went out.

• Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

  Biological diversity has become widely recognized as a critical conservation issue only in the past two decades. The rapid destruction of the tropical rain forests, which are the ecosystems with the highest known species diversity on Earth, has awakened people to the importance and fragility of biological diversity. The high rate of species extinctions in these environments is jolting, but it is important to recognize the significance of biological diversity in all ecosystems. As the human population continues to expand, it will negatively affect one after another of Earth‟s ecosystems. In terrestrial ecosystems and in fringe marine ecosystems (such as wetlands), the most common problem is habitat destruction. In most situations, the result is irreversible. Now humans are beginning to destroy marine ecosystems through other types of activities, such as disposal and runoff of poisonous waste; in less than two centuries, by significantly reducing the variety of species on Earth, they have irrevocably redirected the course of evolution.

  Certainly, there have been periods in Earth‟s history when mass extinctions have occurred. The extinction of the dinosaurs was caused by some physical event, either climatic or cosmic. There have also been less dramatic extinctions, as when natural competition between species reached an extreme conclusion. Only 0.01 percent of the species that have lived on Earth have survived to the present, and it was largely chance that determined which species survived and which died out.

  However, nothing has ever equaled the magnitude and speed with which the human species is altering the physical and chemical world and demolishing the environment. In fact, there is wide agreement that it is the rate of change humans are inflicting, even more than the changes themselves, that will lead to biological devastation. Life on Earth has continually been in flux as slow physical and chemical changes have occurred on Earth, but life needs time to adapt-time for migration and genetic adaptation within existing species and time for the proliferation of new genetic material and new species that may be able to survive in new environments.

  The author mentions all of the following as examples of the effect of humans on the world‟s

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

    It’s often said that we learn things at the wrong time. University students frequently do the minimum of work because they’re crazy about a good social life instead. Children often scream before their piano practice because it’s so boring. They have to be given gold stars and medals to be persuaded to swim, or have to be bribed to take exams. But the story is different when you’re older.

    Over the years, I’ve done my share of adult learning. At 30,1 went to a college and did courses in History and English. It was an amazing experience. For starters, I was paying, so there was no reason to be late - I was the one frowning and drumming my fingers if the tutor was late, not the other way round. Indeed, if I could persuade him to linger for an extra five minutes, it was a bonus, not a nuisance. I wasn’t frightened to ask questions, and homework was a pleasure not a pain. When I passed an exam, I had passed it for me and me alone, not for my parents or my teachers. The satisfaction I got was entirely personal.

    Some people fear going back to school because they worry that their brains have got rusty. But the joy is that, although some parts have rusted up, your brain has learnt all kinds of other things since you were young. It has learnt to think independently and flexibly and is much better at relating one thing to another. What you lose in the rust department, you gain in the maturity department.

    In some ways, age is a positive plus. For instance, when you’re older, you get less frustrated. Experience has told you that, if you’re calm and simply do something carefully again and again, eventually you’ll get the hang of it. The confidence you have in other areas - from being able to drive a car, perhaps - means that if you can’t, say, build a chair instantly, you don’t, like a child, want to destroy your first pathetic attempts. Maturity tells you that you will, with application, eventually get there.

            I hated piano lessons at school, but I was good at music. And coming back to it, with a teacher who could explain why certain exercises were useful and with musical concepts that, at the age of ten, I could never grasp, was magical. Initially, I did feel a bit strange, thumping out a piece that I’d played for my school exams, with just as little comprehension of what the composer intended as I’d had all those years before. But soon, complex emotions that I never knew poured out from my fingers, and suddenly I could understand why practice makes perfect.

  The writer’s main point in paragraph 2 is to show that as people grow up, __________.

• Khi Hội đồng trọng tài lao động đang tiến hành giải quyết tranh chấp lao động tập thể về lợi ích thì tập thể người lao động có thể:

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

  How might volunteering contribute to lower blood pressure? Performing volunteer work could increase physical activity among people who aren’t otherwise very active, says lead study author Rodlescia Sneed, a doctoral candidate in social and health psychology at Carnegie Mellon University. It may also reduce stress. “Many people find volunteer work to be helpful with respect to stress reduction, and we know that stress is very strongly linked to health outcomes,” she says. As with any activity thought to improve health, researchers are trying to identify the specific characteristics of volunteering that provide the greatest benefit. For example, how much time would you need to put into volunteer work to lower your blood pressure or live longer? In the Carnegie Mellon study, 200 hours of volunteering per year correlated to lower blood pressure. Other studies have found a health benefit from as little as 100 hours of volunteering a year. Which types of volunteer activities improve health the most? No one really knows. Sneed speculates that mentally stimulating activities, like tutoring or reading, might be helpful for maintaining memory and thinking skills, while “activities that promote physical activity would be helpful with respect to cardiovascular health, but no studies have really explored this.” One key for deriving health benefits from volunteering is to do it for the right reasons. A 2012 study in the journal Health Psychology found that participants who volunteered with some regularity lived longer, but only if their intentions were truly altruistic. In other words, they had to be volunteering to help others not to make  them selves feel better.

  The Greek philosopher Aristotle once surmised that the essence of life is “To serve others and do good.” If recent research is any indication, serving others might also be the essence of good health.

  According to paragraph 4, what is the lesson from one of the greatest intellectual figures in history?

• Match the sentences to the responses.

                                A                                                                   B

  1. How much time do you spend on your English?	A. My Mom always helps me with my English.
  2. Could you do me a favor?	B. It’s a pleasure to meet you.
  3. Hello. 3457891200	C. How can I help you?
  4. Jim, I’d like you to meet my aunt, Lien	D. No, thank you. I’m fine.
  	E. More than an hour.
  	F. Can I speak to Mary, please? This is Minh.

• Japanese initially used jeweled objects to decorate swords and ceremonial items.

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