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224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Hợp chất nào có áp suất hơi bão hòa cao nhất ở 25°C?

Hóa học Lớp 11
Xem chi tiết 529 lượt xem 6 năm trước
II.QUY LUẬT CHUNG VỀ TÍNH CHẤT HÓA HỌC

Lấy 8,76 gam một đipeptit tạo ra từ glyxin và alanin cho tác dụng vừa đủ với dung dịch HCl 1M. Thể tích dung dịch HCl tham gia phản ứng là:

Hóa học Lớp 12
Xem chi tiết 22.5 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

This is the second time______.

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesAs mentioned in the passage, photography can ______.

Tiếng Anh Tốt nghiệp THPT
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.Adam: "It was very kind of you to help me out, Anna?" Anna: “________”

Tiếng Anh Tốt nghiệp THPT
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224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Có hai ống nghiệm mất nhãn chứa từng chất riêng biệt là dung dịch ancol but-1-ol (ancol butylic) và dung dịch phenol. Nếu chỉ dùng 1 hoá chất để nhận biết 2 chất trên thì hoá chất đó là 

Hóa học Lớp 11
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesMatthew Brady was well-known for ______.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

______ she can buy everything she likes.

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.Industrial cities appeared after the full development of industrial capitalism in the core nation- stages of the eighteenth century.

Tiếng Anh Tốt nghiệp THPT
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15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 8)

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 569 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 8)

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesThe word “lifelike” in the passage is closest in meaning to “______”.

Tiếng Anh Tốt nghiệp THPT
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224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Số đồng phân là hợp chất thơm có công thức phân tử C8H10O tác dụng được với NaOH là:

Hóa học Lớp 11
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. ________, the results couldn’t be better.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 14.6 K lượt xem 6 năm trước
Bộ đề luyện thi Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Sợi visco thuộc loại

Hóa học Tốt nghiệp THPT
Xem chi tiết 283 lượt xem 6 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.To the naked eye, this silk appears to be smooth, but under the microscope, cultivated silk fiber looks coarse.

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesThe word “ruined” in the passage is closest in meaning to “______”.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 615 lượt xem 6 năm trước
224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Cho các phản ứng :a HBr+C2H5OH→tobC2H4+Br2→c C2H4+HBr→d C3H4+Br2→askt, 1:1Số phản ứng tạo ra C2H5Br là :

Hóa học Lớp 11
Xem chi tiết 707 lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

Neither the students nor their lecturer______ English in the classroom.

Tiếng Anh Tốt nghiệp THPT
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CÂU HỎI VẬN DỤNG

Cho dãy các dung dịch: glucozơ, saccarozơ, etanol, glixerol. Số dung dịch trong dãy phản ứng được với Cu(OH)2 ở nhiệt độ thường tạo thành dung dịch có màu xanh lam là

Hóa học Lớp 12
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.Which of the following is best supported by the passage?

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesThe word “this” in the passage refers to the ______.

Tiếng Anh Tốt nghiệp THPT
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.The boy was sent to the police because of several ________ that he had taken part in.

Tiếng Anh Tốt nghiệp THPT
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Chương I. ĐỘNG HỌC CHẤT ĐIỂM (P2)

Hai chất điểm rơi tự do từ các độ cao h1,h2. Coi gia tốc rơi tự do của chúng là như nhau. Biết vận tốc tương ứng của chúng khi chạm đất là v1=3v2  thì tỉ số giữa hai độ cao tương ứng là

Vật lý Lớp 10
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Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

I can______  with most things but I cannot stand noisy children.

Tiếng Anh Tốt nghiệp THPT
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CÂU HỎI VẬN DỤNG

Cho dung dịch các chất :  C3H5(OH)3, CH3COOH, Ala-Gly-Ala, C12H22O11(saccarozo), CH3CHO, HOCH2CH2CH2OH, C2H3COOH. Số chất hòa tan được Cu(OH)2 ở điều kiện thường là :

Hóa học Lớp 12
Xem chi tiết 2 K lượt xem 6 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.The word "detectable" is closest in meaning to _____.

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesDaguerre took a picture of his studio with ______.

Tiếng Anh Tốt nghiệp THPT
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15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 8)

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.

Tiếng Anh Tốt nghiệp THPT
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15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 8)

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.

Tiếng Anh Tốt nghiệp THPT
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.To buy this type of product, you must pay half of the money ________, and pay the rest on the day of delivery.

Tiếng Anh Tốt nghiệp THPT
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BÀI TẬP LÝ THUYẾT

Glucozơ không tham gia phản ứng

Hóa học Lớp 12
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Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

The more______ you are, the easier it is for you to make friends.

Tiếng Anh Tốt nghiệp THPT
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Chương I. ĐỘNG HỌC CHẤT ĐIỂM (P2)

Một vật nhỏ rơi tự do từ các độ cao h=80m so với mặt đất. Lấy gia tốc rơi tự do lấy g=9,8 m/s2. Quãng đường vật đi được trong 1 giây cuối cùng trước khi chạm đất là

Vật lý Lớp 10
Xem chi tiết 517 lượt xem 6 năm trước
Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.According to the passage, the numerical valued of the concentration level of a substance is only useful if_____.

Tiếng Anh Tốt nghiệp THPT
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20 Đề ôn thi Tiếng Anh chuẩn cấu trúc có lời giải chi tiết (Đề số 03)

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.    In 1826, a Frenchman named Niépce needed pictures for his business. He was not a good artist, so he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph.    The next important date in the history of photography was 1837. That year, Daguerre, another Frenchman, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything clearly, even the smallest details. This kind of photograph was called a daguerreotype.    Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities, and mountains.    In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple and photographers had to carry lots of film and processing equipment. However, this did not stop photographers, especially in the United States. After 1840, daguerreotype artists were popular in most cities.Matthew Brady was one well-known American photographer. He took many portraits of famous people. The portraits were unusual because they were lifelike and full of personality. Brady was also the first person to take pictures of a war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.In the 1880s, new inventions began to change photography. Photographers could buy film ready- made in rolls, instead of having to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later. They did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.    With a small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends, and favorite places. They called these pictures "snapshots".    Documentary photographs became popular in newspapers in the 1890s. Soon magazines and books also used them. These pictures showed true events and people. They were much more real than drawings.    Some people began to think of photography as a form of art. They thought that photographycould do more than show the real world. It could also show ideas and feelings, like other art forms. From “Reading Power” by Beatrice S. Mikulecky and Linda JeffriesThe first photograph was taken with ______.

Tiếng Anh Tốt nghiệp THPT
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Bộ đề luyện thi Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Hợp chất X có công thức cấu tạo HCOOC2H5. X có tên gọi nào sau đây?

Hóa học Tốt nghiệp THPT
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.Where did you buy that ________ handbag?

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.The word "noxious' is closest in meaning to _____.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

It is high time we______ something to protect our environment

Tiếng Anh Tốt nghiệp THPT
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224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Số đồng phân cấu tạo ứng với công thức phân tử C3H8O bằng :

Hóa học Lớp 11
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224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

A có công thức phân tử C5H11Cl. Tên của A phù hợp với sơ đồ: A → B (ancol bậc 1) → C → D (ancol bậc 2) → E → F (ancol bậc 3)

Hóa học Lớp 11
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

 Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.According to the passage, which of the following is true about human-generated air pollution in localized regions? 

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 862 lượt xem 6 năm trước
BÀI TẬP LÝ THUYẾT

Có các phát biểu sau:(a) Nước brom có thể phân biệt được glucozơ và fructozơ.(b) Saccarozơ chỉ tồn tại dưới dạng mạch vòng.(c) Glucozơ được sử dụng làm thuốc tăng lực cho người ốm.(d) Thủy phân saccarozơ trong môi trường axit thu được α -glucozơ và β -fructozơ.(e) Amylopectin có mạch phân nhánh gồm các β -glucozơ liên kết với nhau bằng β-l,4-glicozit và β-l,6-glicozit.(f) Hiđro hóa glucozơ hoặc fructozơ đểu thu được sorbitol. Sổ phát biểu đúng là

Hóa học Lớp 12
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Bộ đề luyện thi Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Công thức cấu tạo thu gọn nào dưới đây là của glyxin (axit 2-amino etanoic)?

Hóa học Tốt nghiệp THPT
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Chương I. ĐỘNG HỌC CHẤT ĐIỂM (P2)

Một vật rơi từ độ cao 10 m so với một sàn thang máy đang nâng đều lên với vận tốc 0,5 m/s để hứng vật. Trong khi vật rơi để chạm sàn, sàn đã được nâng lên một đoạn bằng (lấy g=9,8 m/s2).

Vật lý Lớp 10
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Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 8)

He walked______ I could not catch up with him.

Tiếng Anh Tốt nghiệp THPT
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25 đề thi thử Tiếng Anh chuẩn cấu trúc bộ giáo dục có lời giải chi tiết(p1)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. If you ________ Peter, could you tell him to ring me up?

Tiếng Anh Tốt nghiệp THPT
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Kỳ thi thử thpt quốc gia lần 1 năm 2019 môn Tiếng Anh cực hay có lời giải(Đề 17)

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.     A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetations, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled-a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.     Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting form human activities. However, human production usually occurs in a localized area, such as a city.     In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.Natural pollutants can play an important role in controlling air pollution for which of the following reasons?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 599 lượt xem 6 năm trước
224 Bài tập ancol- phenol cực hay có đáp án (phần 5)

Để nhận biết các chất riêng biệt gồm C2H5OH, HCOOH, C6H5OH, C2H4OH2 ta dùng cặp hoá chất nào sau đây?

Hóa học Lớp 11
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