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• Công thức tổng quát của chất béo là:

Câu 1:

Công thức tổng quát của chất béo là:

A.

(RCOO)2C2H5.

B.

(RCOO)3C3H5.

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Chất béo là hỗn hợp nhiều este của glixerol với các axit béo và có công thức chung là: (RCOO)3C3H5.

Vậy đáp án đúng là B. 

C.

(RCOO)2C2H4.

D.

RCOOCH3.

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 8

• 15 phút
• 10 câu hỏi

Làm bài kiểm tra

Một số câu hỏi từ cùng một bài kiểm tra

• Xà phòng hóa tristearin bằng NaOH, thu được glixerol và chất X. Chất X là:      

• Loại dầu nào sau đây không phải là este của axit béo và glixerol?         

• Phát biểu nào sau đây là đúng ?         

• Công thức của glixerol là

• Công thức tổng quát của chất béo là:

• 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 axit béo với ancol nào sau đây:

• Chất béo là trieste của axit béo với         

• Chất béo là trieste của axit béo với ancol nào sau đây :

• Chất nào sau đây không thuộc loại chất béo?

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 answer to each of the questions from 43 to 50.

       In addition to improved physical health, sport plays a primarily positive role in youth development, including improved academic achievement, higher self- esteem, fewer behavioural problems, and better psychosocial development. Many studies focus on the effects of sport on the five “C’ s” - competence, confidence, connections, character, and caring The many facets of playing sport - the discipline of training, learning teamwork, following the leadership of coaches and captains, learning to lose - provide lifelong skills for athletes.

        The literature on youth sport stresses the positive effects of participation in learning the important life skills of goal setting and time management combined with enjoyment; the development of a strong sense of morality; and the development of an appreciation of diversity. Studies have shown that children and youth participating in sport, when compared to peers who do not play sport, exhibit higher grades, expectations, and attainment; greater personal confidence and self-esteem; greater connections with school — that is, greater attachment and support from adults; stronger peer relationships; more academically oriented friends; greater family attachment and more frequent interactions with parents; more restraint in avoiding risky behaviour; and greater involvement in volunteer work.

        Sport provides opportunities for children and youth to engage in valuable and positive relationships with adults. Thus, it is a missed opportunity for children who are “gated” - or not included in sport - during early stages of childhood because they are less well behaved than other children. These children are being prevented from participating in the very thing that could help them learn to control and regulate their behaviour. Sport provides an opportunity for children to safely navigate and negotiate between right and wrong as they learn to interact with peers and adults. Research by Taliaferro et al. suggests that playing sport can even protect against suicide risk in youth. Compared to nonathletes, male athletes exhibit lower levels of hopelessness and suicidal ideation. Young males involved in multiple sports seem to gamer even more protection in this regard. Similar results were found for girls. Research on the role of exercise in adults confirms that it improves mood and alleviates many forms of depression. Bartko and Eccles found that youth who are highly involved in sport are more “psychologically resilient,” that is, better able to recover from problems. Eccles et al. found that sport participation protects young athletes against social isolation.

  (Adaptedfrom: Sport is a way of life, Sun Star Baguio, Jan 10, 2017)

  What does the word “gated” in the third paragraph mean?

• Dẫn hợp chất hữu cơ X (có khối lượng phân tử là 56) vào nước brom, quan sát thấy nước brom nhạt màu. Chất hữu cơ X có thể là

• Tom and his friend were________(HOPE) lost in Japan.

• Choose the word of phrase that best fits the blank space in the following passage

  I’m (1) _______________ to hear you had an (2) _______________ Christmas vacation. I (3) _______________ my first report few days ago. I got good grades (4) _______________ English, but my math result (5) _______________ poor. My math teacher asked me to spend more time on it. I must study (6) _______________ for the next semester.

  Question 4:

•  Read the passage. Then do the following tasks. It is very necessary for language learners to learn words when they learn a foreign language. However, they learn words in different ways. Some learners make a list and put into it the meanings of new words in their mother tongue, and try to learn them by heart. Others write one or two example sentences with each new word to remember how to use the word in the right way. In order to remember words better, some learners even write each word and its use on a small piece of paper and stick it somewhere in their house to learn it at any time. To remember important words, some learners underline or highlight only the words they want to learn. Language learners should try different ways of learning words so as to find out the best way for themselves. * True or false.

  What do some learners do to remember important words?

  ……………………………………………………………………………………………….

• Tung: “Your shoes are terrific, Tuan. The colour quite suits you.”

  Tuan: “______”