chất nào sau đây có phản ứng tráng gương

ID 433913. Cặp chất nào sau đây đều cho phản ứng tráng gương? A. CH3COOH và HCOOH. B. HCOOH và C6H5COOH. C. HCOOH và HCOONa. D. C6H5ONa và HCOONa. Nếu có hãy viết phương trình phản ứng và gọi tên sản phẩm tạo thành: S O 3 , N a 2 O , A l 2 O 3 , CaO, P 2 O 5 , CuO, C O 2 Cho các oxit có công thức hóa học như sau: SO3, FeO, CO2, CaO, CrO3, ZnO, N2O,SO2, K2O, P2O5, Al2O3, MgO, CO.+ Những chất thuộc loại oxit nào.+ Hãy gọi tên những oxit trên Có nhiều cách thức truyền giáo, nhưng sau đây là những cách mà người viết nghĩ có thể thể mang lại hiệu quả cao, đó là: Cầu nguyện, sống gương mẫu, bác ái, tiếp xúc các nhân và đối thoại. Cầu nguyện: Công trình cứu độ là của Thiên Chúa. Chúng ta chỉ là người Để tráng một số lượng gương soi có diện tích bề mặt 0,35 m 2 với độ dày 0,1 μm người ta đun nóng dung dịch chứa 30,6 gam glucozơ với một lượng dung dịch bạc nitrat trong amoniac. Biết khối lượng riêng của bạc là 10,49 g/cm 3, hiệu suất phản ứng tráng gương là 80% (tính Câu 11. Phản ứng với chất nào sau đây chứng tỏ glucozơ có nhóm CHO? Trang - 9 A. Cu(OH)2 tạo dung dịch xanh lam. B. AgNO3/NH3. C. lên men rượu. D. tạo este. Câu 12. Thể tích dung dịch HNO3 63% (d = 1,52 g/ml) cần dùng để tác dụng với lượng dư xenlulozơ tạo 297 gam xenlulozơ trinitrat là A Câu 1 : Nguồn sáng là vật có đặc điểm nào sau đây ?A . hắt lại ánh sáng chiếu đến nóB . để ánh sáng truyền qua nóC .tự n ID 630936. Chất nào sau không có phản ứng tráng gương? A. Etanal. B. Axit axetic. C. Fructozơ. D. Axit fomic. C. Trong phản ứng este hóa giữa CH3COOH với CH3OH, H2O tạo nên từ –OH trong nhóm –COOH của axit và H trong nhóm –OH của ancol. Đáp án chính xác. D. Phản ứng giữa axit axetic với ancol benzylic (ở điều kiện thích hợp), tạo thành benzyl axetat có mùi thơm của chuối chín skivlireder1978. 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 questions from 36 to 42 Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols, and gestures may be found in every known culture. The basic function of signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of a telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver’s cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols, and gestures are very useful, they do have a major disadvantage in communication. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction comes to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television, and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no one doubts but that there are more means of communication on the horizon. Question 36 Which of the following would be the best title for the passage? 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 36 to 42 Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols, and gestures may be found in every known culture. The basic function of signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of a telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver’s cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols, and gestures are very useful, they do have a major disadvantage in communication. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction comes to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television, and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no one doubts but that there are more means of communication on the horizon. Question 41 Why were the telephone, radio, and television invented? 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 36 to 42 Although speech is the most advanced form of communication, there are many ways of communicating without using speech. Signals, signs, symbols, and gestures may be found in every known culture. The basic function of signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes of a telegraph circuit. Coded to refer to speech, the potential for communication is very great. Less adaptable to the codification of words, signs also contain meaning in and of themselves. A stop sign or a barber pole conveys meaning quickly and conveniently. Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver’s cultural perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. Gestures such as waving and handshaking also communicate certain cultural messages. Although signals, signs, symbols, and gestures are very useful, they do have a major disadvantage in communication. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction comes to a halt. As a result, means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television, and the telephone, one must add fax, paging systems, electronic mail, and the Internet, and no one doubts but that there are more means of communication on the horizon. Question 42 It may be concluded from this passage that ____________. Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question What does the author mean by staring that, "At interpersonal levels, tone may reflect ideas and feelings over and above the words chosen"? Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question The word "Here" in line 8 refers to…………… Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question What does the passage mainly discuss? Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question According to the passage, an overconfident front may hide………… Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question The word "drastically" in line 18 is closest in meaning to…………… Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question Why does the author mention "artistic, political, or pedagogic communication" ? Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions A number of factors related to the voice reveal the personality of the speaker. The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and/or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication. Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed. Question According to the passage, an exuberant tone of voice may be an indication of a person's……… YOMEDIA Câu hỏi Chất nào sau đây có phản ứng tráng gương? A. C2H5COOH. B. CH3COOCH3. C. HCOOCH=CH2. D. CH3COOCH=CH2. Lời giải tham khảo Đáp án đúng C Mã câu hỏi 155655 Loại bài Bài tập Chủ đề Môn học Hóa học Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài CÂU HỎI KHÁC Cho hình vẽ thí nghiệm phân tích định tính hợp chất hữu cơ C6H12O6 Phát biểu nào sau đây là đúng ? Lên men 150 gam tinh bột thu được bao nhiêu ml ancol etylic 46o d = 0,8 g/ml? Cho biết hiệu suất phản ứng đạt 81%. Xenlulozơ trinitrat được điều chế từ axit nitric và xenlulozơ hiệu suất phản ứng 90% tính theo axit nitric. Để có 14,85 kg xenlulozơ trinitrat cần dung dịch chứa m kg axit nitric. Giá trị của m là Cho sơ đồ chuyển hóa Triolein +H2 dư → X + NaOH dư → Y + HCl → chất hữu cơ Z. Tên của Z là Quả chuối xanh có chứa chất X bị chuyển thành màu xanh tím khi nhỏ dung dịch iot lên mặt cắt của quả chuối. Chất X là Chất tác dụng với H2 tạo thành sobitol là Chất béo là trieste được tạo bởi Khi lên men 180 gam glucozơ với hiệu suất 100%, khối lượng ancol etylic thu được là Tiến hành thí nghiệm điều chế etyl axetat theo các bước sau đây Đốt cháy hoàn toàn m gam một chất béo triglixerit cần 1,61 mol O2, sinh ra 1,14 mol CO2 và 1,06 mol H2O. Chất nào sau đây có phản ứng tráng gương? Cho các phát biểu sau a Các triglixerit đều có phản ứng cộng hiđro trong điều kiện thích hợ Chất nào sau đây là monosaccarit? Công thức tổng quát của este được tạo thành từ axit không no có 1 nối đôi C=C, đơn chức, mạch hở và ancol no, đơn chức, mạch hở là Cho các phát biểu sau về cacbohiđrat Đốt cháy hoàn toàn m gam một hỗn hợp X gồm glucozơ, saccarozơ, metanal và metyl fomat toàn bộ sản phẩm cháy hấp thụ hết trong bình chứa dung dịch CaOH2 dư, sau thí nghiệm khối lượng bình tăng m + 86,4 gam và trong bình có m + 190,8 gam kết tủa. Giá trị của m gần nhất với giá trị Có bao nhiêu chất đồng phân cấu tạo ứng với công thức phân tử C3H6O2 đều tác dụng được với dung dịch NaOH? Chất nào dưới đây không phải là este? Este X có công thức cấu tạo CH3CH2COOCH3. Tên gọi của X là Thủy phân hoàn toàn m gam tripeptit Gly-Ala-Ala bằng dung dịch NaOH vừa đủ, thu được dung dịch X. Cô cạn toàn bộ dung dịch X thu được 3,19 gam muối khan. Giá trị của m là Thêm vài giọt phenolphtalein vào dung dịch etylamin được dung dịch X. Hiện tượng quan sát được khí nhỏ từ từ đến dư dung dịch HCl vào X là Xà phòng hoá hoàn toàn 0,1 mol một este no, đơn chức, mạch hở bằng 26 gam dung dịch MOH 28% M là kim loại kiềm, rồi tiến hành chưng cất sản phẩm thu được 26,12 gam chất lỏng X và 12,88 gam chất rắn khan Y. Đốt cháy hoàn toàn chất rắn Y, thu được H2O, V lít CO2 đktc và 8,97 gam một muối duy nhất. Giá trị của V là. Cho 8,8 gam CH3COOC2H5 phản ứng hết với dung dịch NaOH dư, đun nóng. Cho các bước ở thí nghiệm sau Cho 3,75 gam amino axit X tác dụng vừa hết với dung dịch NaOH, thu được 4,85 gam muối. Cho m gam glucozơ tác dụng với lượng dư dung dịch AgNO3/NH3 thu được 86,4 gam Ag. Nếu lên men hoàn toàn m gam glucozơ rồi cho khí CO2 thu được hấp thụ vào nước vôi trong dư thì lượng kết tủa thu được là Cho 15 gam hỗn hợp các amin gồm anilin, metylamin, đimetylamin, đietylmetylamin tác dụng vừa đủ với 50 ml dung dịch HCl 1M. Khối lượng sản phẩm thu được có giá trị là Đun nóng dung dịch chứa 27,0 gam glucozơ với lượng dư dung dịch AgNO3 trong NH3, đến khi phản ứng xảy ra hoàn toàn thu được m gam Ag. Giá trị của m là Ở điều kiện thích hợp, hai chất phản ứng với nhau tạo thành metyl fomat là Đốt cháy hoàn toàn V lít hơi một amin X no, mạch hở, đơn chức, bậc 1 bằng O2 vừa đủ thì thu được 12V hỗn hợp khí và hơi gồm CO2, H2O và N2. Các thể tích khí đều đo ở cùng điều kiện nhiệt độ, áp suất. Số đồng phân cấu tạo thỏa mãn các điều kiện trên của X là Khi thủy phân hoàn toàn tripeptit H2N-CHCH3CO-NH-CH2-CO-NH-CH2-COOH sẽ tạo ra các a - amino axit nào ? 18,5 gam chất hữu cơ A có công thức phân tử C3H11N3O6 tác dụng vừa đủ với 300 ml dung dịch NaOH 1M tạo thành nước, 1 chất hữu cơ đa chức bậc I và m gam hỗn hợp muối vô cơ. Giá trị gần đúng nhất của m là Cho X là pentapeptit Ala–Gly–Ala–Val–Gly và Y là tetrapeptit Gly–Ala–Gly–Glu. Thủy phân hoàn toàn m gam hỗn hợp gồm X và Y, thu được 4 amino axit, trong đó có 30 gam glyxin và 28,48 gam alanin. Giá trị của m là Phần trăm khối lượng nitơ trong phân tử alanin bằng Amin nào sau đây thuộc loại amin bậc 3? Cho các chất sau Tinh bột; glucozơ; saccarozơ; xenlulozơ; fructozơ. Số chất không tham gia phản ứng tráng gương là Chất nào sau đây khi thủy phân tạo các chất đều có phản ứng tráng gương? Chất nào sau đây dùng làm thuốc hỗ trợ thần kinh? Etylamin C2H5NH2 tác dụng được với chất nào sau đây trong dung dịch? ZUNIA9 XEM NHANH CHƯƠNG TRÌNH LỚP 12 YOMEDIA Phản ứng tráng gương là phản ứng đặc trưng cho hợp chất có nhóm –CHO hoặc trong môi trường kiềm chuyển thành nhóm –CHO như anđehit RCHOn, axit fomic HCOOH, muối của axit fomic, este của axit fomic, glucozơ, fructozơ, … CH3CHO etanal, CH3COOH axit axetic, C6H12O6 fructozơ, HCOOH axit fomic Các chất có phản ứng tráng gương là CH3CHO, C6H12O6, HCOOH \\begin{gathered} C{H_3}CHO\xrightarrow{{ + AgN{O_3}/N{H_3}}}C{H_3}COON{H_4} + 2Ag \downarrow \hfill \\ \underbrace {{C_5}{H_{11}}{O_5}CHO}_{Frutoz{\text{\neg }}}\xrightarrow{{ + AgN{O_3}/N{H_3}}}{C_5}{H_{11}}{O_5}COON{H_4} + 2Ag \downarrow \hfill \\ HCOOH\xrightarrow{{ + AgN{O_3}/N{H_3}}}{N{H_4}_2}C{O_3} + 2Ag \downarrow \hfill \\ \end{gathered} \ CH3COOH không có phản ứng tráng bạc nhưng vẫn tác dụng với NH3 trong dung dịch AgNO3/NH3 \C{H_3}COOH + N{H_3} \to C{H_3}COON{H_4}\ Đáp án B. Cho các kim loại Na, Fe, Al, Cu, Cr, Ag. Số kim loại không phản ứng với H2SO4 đặc nguội và HNO3 đặc nguội làA 3. B 2. C 4. D 5.