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• Công thức của triolein là         

Câu 1:

Công thức của triolein là         

A.

A: (CH3[CH2]16COO)3C3H5

B.

B: (CH3[CH2]7CH=CH[CH2]5COO)3C3H5

C.

C: (CH3[CH2]7CH=CH[CH2]7COO)3C3H5

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Đáp án C Công thức của triolein là (CH3[CH2]7CH=CH[CH2]7COO)3C3H5  

 

VẬY ĐÁP ÁN ĐÚNG LÀ C

 

 

D.

D: (CH3[CH2]14COO)3C3H5

Những câu hỏi này đến từ bài kiểm tra này. Bạn có muốn thực hiện bài kiểm tra thử không?

Bài tập trắc nghiệm 15 phút Khái niệm, cấu tạo, đồng phân, danh pháp Lipit - Hóa học 12 - Đề số 4

• 15 phút
• 10 câu hỏi

Làm bài kiểm tra

Một số câu hỏi từ cùng một bài kiểm tra

• Cho glixerol phản ứng với hỗn hợp axit béo gồm C17H35COOH và C15H31COOH, số loại trieste được tạo ra tối đa là ?            

• Chất béo là trieste của glixerol với axit béo. Tristearin có công thức cấu tạo thu gọn là

• Triolein có công thức là:

• Thủy phân một triglixerit X bằng nhau dung dịch NaOH, thu được hỗn hợp muối gồm natri oleat, natri stearat (có tỉ lệ mol tương ứng là 1:2) và glixerol. Có bao nhiêu triglixerit X thỏa mãn tính chất trên.

• Trong dầu mỡ động vật, thực vật có  

• Công thức phân tử của tristearin là         

• Công thức nào sau đây có thể là công thức của chất béo lỏng?

• Trieste của glixerol với chất nào sau đây là chất béo         

• Công thức của triolein là         

• Thủy phân hoàn toàn 444 gam một lipit thu được 46 gam glixerol (glixerin) và hai loại axit béo. Hai loại axit béo đó là (cho H=1, C=12, O=16)         

Một số câu hỏi khác bạn có thể quan tâm

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrases that best fits each of the numbered blanks from 46 to 50.

  ABROAD WITH US

  The company study abroad was originally founded in 1991 for students who wished to study French in France. Its success led to the establishment of other schools around the world.

  Learning the language in the country in which it is spoken is, of course,a (46)_______ more effective and faster process than studying in your own country. It is also an opportunities to mix with local habitants and (47)_______ a greater and deeper (48)_______ of the people whose language you are studying. This makes the whole experience much more enjoyable.

  You may wish to attend an Italian language and a cooking course in Italy or combine a Portuguese course with a sport. You should look at all the possibilities and (49)_______ the best choice.

  In order to choose the (50)_______ course and location for you, we suggest you contact us to discuss your particular requirements. From the information you give us, we can make some recommendation.

  You should look at all the possibilities and (49)_______ the best choice.

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions.

  The organizers failed to do the necessary arrangements for dealing with so many people.

• Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word that best fits each of the numbered blanks from 27-38.

  DISAPPEARING ALASKAN SEALS

  On a winter afternoon, a dozen male Northern fur seals are on an island off south-western Alaska. To look at them, fighting for territory on the rocks, it’s hard to imagine that they are at the (27)____________of a baffling scientific mystery: why is this species beginning to disappear? These seals- which can weigh up to 270 kilograms-have an important and symbolic (28)_________in Alaska’s history. Their soft and luxurious fur, the coveted prize during the huge commercial sea harvests that were legal here in the Bering Sea through the early 20th century, was once so valuable it (29)_________Alaska’s economy. Starting in the 1950s, for reasons that are (30)_______because the harvests by then tended to be fairly small, the seal population began a slow decline . But lately it has been falling drastically, declining at an alarming (31)________of 6 per cent a year since 1998. From a (32)_________ of more than 2 million in Alaska in 1948, their numbers have fallen to about 1 million.

  So (33)________, no one has been able to establish a precise cause for this, although theories (34)___________. The seals' food supply may be (35)________, or another species may be (36)________on the seals- perhaps killer whales, which no longer have as many great whales to eat because of harvesting of those mammals. Some people have suggested that the decline can be (37)______to entanglement in fishing nets ,but scientists say they doubt that this alone could (38)_________the recent population decline.

  Điền vào ô 37.

• Friends sat on _______ side of me on the plane.

• 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 from 34 to 41.

    Overpopulation, the situation of having large numbers of people with too few resources and too little space, is closely associated with poverty. It can result from high population density, or from low amounts of resources, or from both. Excessively high population densities put stress on available resources. Only a certain number of people can be supported on a given area of land, and that number depends on how much food and other resources the land can provide. In countries where people live primarily by means of simple farming, gardening, herding, hunting, and gathering, even large areas of land can support only small numbers of people because these labor-intensive subsistence activities produce only small amounts of food.

    In developed countries such as the United States, Japan, and the countries of Western Europe, overpopulation generally is not considered a major cause of poverty. These countries produce large quantities of food through mechanized farming, which depends on commercial fertilizers, large-scale irrigation, and agricultural machinery. This form of production provides enough food to support the high densities of people in metropolitan areas.

    A country’s level of poverty can depend greatly on its mix of population density and agricultural productivity. Bangladesh, for example, has one of the world’s highest population densities, with 1, 147 persons per sq km. A large majority of the people of Bangladesh engage in low -productivity manual

  D. possibly D. do D. ways D. kilo D. on

  farming, which contributes to the country’s extremely high level of poverty. Some of the smaller countries in Western Europe, such as the Netherlands and Belgium, have high population densities as well. These countries practice mechanized farming and are involved in high-tech industries, however, and therefore have high standards of living.

    At the other end of the spectrum, many countries in sub-Saharan Africa have population densities of less than 30 persons per sq km. Many people in these countries practice manual subsistence farming; these countries also have infertile land, and lack the economic resources and technology to boost productivity. As a consequence, these nations are very poor. The United States has both relatively low population density and high agricultural productivity; it is one of the world’s wealthiest nations.

    High birth rates contribute to overpopulation in many developing countries. Children are assets to many poor families because they provide labor, usually for farming. Cultural norms in traditionally mral societies commonly sanction the value of large families. Also, the governments of developing countries often provide little or no support, financial or political, for family planning; even people who wish to keep their families small have difficulty doing so. For all these reasons, developing countries tend to have high rates of population growth.

  (From "Poverty" by Thomas J. Corbett)

  What will suffer when there are excessively high population densities?

• Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions