Cho phương trình hóa học của phản ứng tổng hợp amoniac : Khi tăng nồng độ của hiđro lên 2 lần, tốc độ phản ứng thuận :

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Một số câu hỏi khác cùng bài thi.

• Một phản ứng xảy ra trong bình kín : 2NO (k) + O₂ (k) 2NO₂ (k) Giữ nguyên nhiệt độ, nén hỗn hợp phản ứng xuống còn 1/3 thể tích. Kết luận nào sau đây không đúng ?
• Cho phương trình hóa học của phản ứng tổng hợp amoniac : Khi tăng nồng độ của hiđro lên 2 lần, tốc độ phản ứng thuận :
• Cho phản ứng : 2SO₂ (k) + O₂ (k) -> 2SO₃ (k) Tốc độ phản ứng thuận tăng lên 4 lần khi :
• Cho phản ứng : A (k) + 2B (k) -> C (k) + D (k) Khi tăng nồng độ của chất B lên 2 lần, nồng độ A không đổi, vận tốc phản ứng thuận sẽ tăng lên
• Trong gia đình, nồi áp suất được sử dụng để nấu chín kỹ thức ăn. Lí do nào sau đây là thích hợp cho việc sử dụng nồi áp suất ?
• Cho phản ứng : 2KClO₃ (r) 2KCl(r) + 3O₂ (k). Yếu tố không ảnh hưởng đến tốc độ của phản ứng trên là :
• Cho phản ứng phân huỷ hiđro peoxit trong dung dịch : 2H₂O₂ 2H₂O + O₂ Những yếu tố ảnh không hưởng đến tốc độ phản ứng là :
• So sánh tốc độ của 2 phản ứng sau (thực hiện ở cùng nhiệt độ) : Zn (bột) + dung dịch CuSO₄ 1M (1) Zn (hạt) + dung dịch CuSO₄ 1M (2) Kết quả thu được là :
• So sánh tốc độ của 2 phản ứng sau (thực hiện ở cùng nhiệt độ, thành phần Zn như nhau) : Zn + dung dịch CuSO₄ 1M (1) Zn + dung dịch CuSO₄ 2M (2) Kết quả thu được là :
• So sánh tốc độ của 2 phản ứng sau : Zn (hạt) + dung dịch CuSO₄ 1M ở 25^oC (1) Zn (hạt) + dung dịch CuSO₄ 1M ở 60^oC(2) Kết quả thu được là :
• Thực nghiệm cho biết tốc độ phản ứng A₂ + B₂ 2AB được tính theo biểu thức : v = k.A₂][B₂]. Trong các điều khẳng định dưới đây, khẳng định nào phù hợp với biểu thức trên ?
• Có phương trình phản ứng : 2A + B -> C Tốc độ phản ứng thuận tại một thời điểm được tính bằng biểu thức: v = k.[A]².[B]. Hằng số tốc độ k phụ thuộc :
• Cho phản ứng A + 2B ->C.  Nồng độ ban đầu của chất A là 1M, chất B là 3M, hằng số tốc độ phản ứng k = 0,5. Tốc độ của phản ứng khi đã có 20% chất A tham gia phản ứng là :
• Tốc độ của một phản ứng có dạng : (A, B là 2 chất khác nhau). Nếu tăng nồng độ A lên 2 lần, nồng độ B không đổi thì tốc độ phản ứng tăng 8 lần. Giá trị của x là :
• Cho phản ứng : A + xB AB_x. Khi tăng nồng độ các chất lên 2 lần thấy tốc độ phản ứng tăng lên 16 lần. Giá trị của x là :
• Trong phản ứng tổng hợp NH₃, trường hợp nào sau đây tốc độ phản ứng thuận sẽ tăng 27 lần ?
• Vận tốc của phản ứng sẽ tăng lên bao nhiêu lần khi tăng nhiệt độ từ 0^oC đến 40^oC, biết khi tăng nhiệt độ lên 10^oC thì tốc độ phản ứng tăng lên gấp đôi.
• Khi nhiệt độ tăng thêm 10^oC thì tốc độ phản ứng tăng 3 lần. Khi nhiệt độ tăng từ 20^oC lên 80^oC thì tốc độ phản ứng tăng lên
• Hệ số nhiệt độ của tốc độ phản ứng là giá trị nào sau đây ? Biết rằng khi tăng nhiệt độ lên thêm 30^oC thì tốc độ phản ứng tăng lên 64 lần.
• Hệ số nhiệt độ của tốc độ phản ứng là giá trị nào sau đây ? Biết rằng khi tăng nhiệt độ lên thêm 50^oC thì tốc độ phản ứng tăng lên 1024 lần.
• Để hoà tan hết một mẫu Zn trong dung dịch axit HCl ở 20^oC cần 27 phút. Cũng mẫu Zn đó tan hết trong dung dịch axít nói trên ở 40^oC trong 3 phút. Vậy để hoà tan hết mẫu Zn đó trong dung dịch nói trên ở 55^oC thì cần thời gian là :

Một số câu hỏi khác có thể bạn quan tâm.

• Có bao nhiêu số hạng hữu tỉ trong khai triển .                         

• 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:

  An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, 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 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 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 from 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, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

  Question: The word "adversely" is closest in meaning to ______        

• Trong khai triển biết tổng các hệ số . Hệ số của bằng:                         

• 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:

  An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, 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 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 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 from 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, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

  Question: What does the passage mainly discuss?         

• Hệ số của trong khai triển của là:                         

• 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:

  An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, 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 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 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 from 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, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

  Question: The word "these" in the second paragraph is closest in meaning to_______

• Hệ số của trong khai triển của là:                         

• Tìm số nguyên dương bé nhất n sao cho trong khai triển có hai hệ số liên tiếp có tỉ số là .                         

• 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:

  An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, 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 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 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 from 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, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

  Question: It can be inferred from the first paragraph that______         

• Trong khai triển , hai số hạng cuối là: