Cho hình vẽ mô tả thí nghiệm điều chế khí Y từ dung dịch X (chỉ chứa một chất tan duy nhất):  

Trong số các chất: Na₂CO₃, H₂O₂, NH₄Cl, NH₄NO₂, số chất thoả mãn điều kiện về chất tan trong X là  

Trong phòng thí nghiệm, khí X được điều chế và thu vào bình tam giác bằng cách đẩy nước như hình vẽ bên.

Phản ứng nào sau đây không áp dụng được cách thu khí này  

Hai chất nào sau đây đều tan tốt trong nước           

Tiến hành thí nghiệm sau: cho 1 ít bột đồng kim loại vào ống nghiệm chứa dung dịch FeCl₃, lắc nhẹ ống nghiệm sẽ quan sát thấy hiện tượng nào sau đây?         

Biết Y là mẩu giấy quì tím ẩm, X và Y không thể là cặp chất nào sau đây:             

Trong các hiện tượng thực hành dưới đây, hiện tượng nào miêu tả không chính xác.  

Hình vẽ sau mô tả cách tiến hành thí nghiệm phản ứng của hồ tinh bột với iot:   Hãy cho biết hiện tượng xảy ra ống 3?

  Nguyên tắc điều chế Flo là :

  Cho các thí nghiệm

(1) Dẫn khí H2S dư qua dung dịch CuCl2

(2) Dẫn khí CO2 dư qua dung dịch Ca(OH)2 

(3) Dẫn khí NH3 dư qua dung dịch Al(NO3)3

(4) Dẫn hỗn hợp khí C2H2 và NH3 dư qua dung dịch AgNO3  

Số trường hợp thu được kết tủa sau khi kết thúc phản ứng là:

Cho dãy các dung dịch sau: C6H5NH2, NH2CH2COOH, HOOC[CH2]2CH(NH2)COOH, C2H5NH2, NH2[CH2]2CH(NH2)COOH. Số dung dịch trong dãy làm đổi màu quỳ tím ?

Trong phòng thí nghiệm, để xử lí sơ bộ chất thải ở dạng dung dịch chứa ion Fe3+ và Cu2+ ta dùng          

  Cho hình vẽ mô tả thí nghiệm điều chế khí Y từ dung dịch X (chỉ chứa một chất tan duy nhất):

Trong số các chất: Na₂CO₃, H₂O₂, NH₄Cl, NH₄NO₂, số chất thoả mãn điều kiện về chất tan trong X là  

Cho hình vẽ mô tả thí nghiệm điều chế khí Y từ dung dịch X (chỉ chứa một chất tan duy nhất):  

Trong số các chất: Na₂CO₃, H₂O₂, NH₄Cl, NH₄NO₂, số chất thoả mãn điều kiện về chất tan trong X là  

Quan sát sơ đồ thí nghiệm sau:  

Phát biểu nào sau đây là không đúng về quá trình điều chế HNO3 trong phòng thí nghiệm theo sơ đồ trên?

Thực hiện các thí nghiệm sau ở nhiệt độ thường:          

(a) Cho bột Al vào dung dịch NaOH.        

(b) Cho bột Fe vào dung dịch AgNO₃.         

(c) Cho CaO vào nước.                

(d) Cho dung dịch Na₂CO₃ vào dung dịch CaCl₂ 

Số thí nghiệm có xảy ra phản ứng là  

Các hình vẽ sau mô tả các cách thu khí thường được sử dụng khi điều chế và thu khí trong phòng thí nghiệm. Hình 3 có thể dùng để thu được những khí nào trong các khí sau: H₂, C₂H₂, NH₃, SO₂, HCl, N₂?  

  Phương pháp điều chế khí clo trong công nghiệp là  

Tiến hành các thí nghiệm sau:         

(a) Cho Al vào dung dịch FeCl3 dư.                       (b) Cho dung dịch AgNO3 dư vào dung dịch FeCl2.         

(c) Nhiệt phân Cu(NO3)2.         (d) Đốt nóng FeCO3 trong không khí.         (e) Điện phân dung dịch AgNO3 với điện cực trơ.

Sau khi kết thúc các phản ứng, số thí nghiệm thu được kim loại là         

Hình vẽ sau đây mô tả thí nghiệm điều chế chất lỏng Y từ dung dịch X:   Trong thí nghiệm, xẩy ra phản ứng hóa học nào sau đây?  

Tiến hành các thí nghiệm sau:         

(a) Cho Al vào dung dịch FeCl₃ dư.                       

(b) Cho dung dịch AgNO₃ dư vào dung dịch FeCl₂.         

(c) Nhiệt phân Cu(NO₃)₂.        

(d) Đốt nóng FeCO₃ trong không khí.        

(e) Điện phân dung dịch AgNO₃ với điện cực trơ.

Sau khi kết thúc các phản ứng, số thí nghiệm thu được kim loại là         

Tiến hành các thí nghiệm sau:

(a) Dẫn khí Cl2 vào dung dịch H2S

(b) Cho dung dịch Ca(HCO3)2 vào dung dịch NaOH

(c) Cho dung dịch Na3PO4 vào dung dịch AgNO3 

(d) Cho CuS vào dung dịch HCl

(e) Cho Cu vào dung dịch chứa HCl và NaNO3       

(g) Cho AgNO3 vào dung dịch NaF

Số thí nghiệm có xảy ra phản ứng ở điều kiện thường là

Một mẫu khí thải được sục vào dung dịch CuSO₄, thấy xuất hiện kết tủa màu đen. Hiện tượng này do trong khí thải có ?         

Cho các dung dịch loãng: (1) AgNO₃, (2) FeCl₂, (3) HNO₃, (4) FeCl₃, (5) hỗn hợp gồm NaNO₃ và HCl. Số dung dịch phản ứng được với Cu là.           

Hình vẽ sau đây mô tả thí nghiệm điều chế chất hữu cơ Y:  

Phản ứng nào sau đây xảy ra trong thí nghiệm trên?

Cho thí nghiệm như hình vẽ. Khi cho nước vào bình chứa chất rắn X, thu được khí Y. Sục khí Y vào dung dịch brom thì thấy dung dịch brom nhạt màu. Y là:   

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:                                                                                                                        

                                                                SCHOOL LUNCH

Research has shown that over half the children in Britain who take their own lunches to school do not eat (31) _______ in the middle of the day. In Britain, schools have to provide meals at lunchtime. Children can choose to bring their own food or have lunch at the school canteen. One shocking (32) _______ of this research is that school meals are much healthier than lunches prepared by parents. There are strict standards for the preparation of school meals, which have to include one portion of fruit and one of vegetables, as well as meat, a dairy item and starchy food like bread or pasta. Lunchboxes (33) _______ by researchers contained sweet drinks, crisps and chocolate bars. Children (34) _______ twice as much sugar as they should at lunchtime. The reseat will provide a better understanding of why the percentage of overweight students in Britain has increased in the last decade. Unfortunately, the government cannot instruct parents, but it can remind them of the (35) _______ value of milk, fruit and vegetables. Children can easily develop bad eating habits at this age, and parents are the only ones who can prevent it.

Question 33:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:                                                                  

                                                                  SCHOOL LUNCH

Research has shown that over half the children in Britain who take their own lunches to school do not eat (31) _______ in the middle of the day. In Britain, schools have to provide meals at lunchtime. Children can choose to bring their own food or have lunch at the school canteen. One shocking (32) _______ of this research is that school meals are much healthier than lunches prepared by parents. There are strict standards for the preparation of school meals, which have to include one portion of fruit and one of vegetables, as well as meat, a dairy item and starchy food like bread or pasta. Lunchboxes (33) _______ by researchers contained sweet drinks, crisps and chocolate bars. Children (34) _______ twice as much sugar as they should at lunchtime. The reseat will provide a better understanding of why the percentage of overweight students in Britain has increased in the last decade. Unfortunately, the government cannot instruct parents, but it can remind them of the (35) _______ value of milk, fruit and vegetables. Children can easily develop bad eating habits at this age, and parents are the only ones who can prevent it.

Question 32:

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                                                     PAPER

'Just imagine a day without paper', reads one advertisement for a Finnish paper company. It adds, ‘You almost certainly see our products every day.’. And they're right. But in most industrial countries, people are so (31) _______ to paper - whether it’s for holding their groceries, for drying their hands or for providing them with the daily news - that its (32) _______ in their daily lives passes largely unnoticed. At one (33) _______ paper was in short supply and was used mainly for important documents, but more recently, growing economies and new technologies have (34) _______ a dramatic increase in the amount of paper used. Today, there are more than 450 different grades of paper, all designed for a different purpose. Decades ago, some people predicted a ‘paperless office’. Instead, the widespread use of new technologies has gone hand-in-hand with an increased use of paper. Research into the relationship between paper use and the use of computers has shown that the general (35) _______ is likely to be one of growth and interdependence. However, the costs involved in paper production, in terms of the world's land, water and air resources, are high. This raises some important questions. How much paper do we really need and how much is wasted?  

Question 31:

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                                                     PAPER

'Just imagine a day without paper', reads one advertisement for a Finnish paper company. It adds, ‘You almost certainly see our products every day.’. And they're right. But in most industrial countries, people are so (31) _______ to paper - whether it’s for holding their groceries, for drying their hands or for providing them with the daily news - that its (32) _______ in their daily lives passes largely unnoticed. At one (33) _______ paper was in short supply and was used mainly for important documents, but more recently, growing economies and new technologies have (34) _______ a dramatic increase in the amount of paper used. Today, there are more than 450 different grades of paper, all designed for a different purpose. Decades ago, some people predicted a ‘paperless office’. Instead, the widespread use of new technologies has gone hand-in-hand with an increased use of paper. Research into the relationship between paper use and the use of computers has shown that the general (35) _______ is likely to be one of growth and interdependence. However, the costs involved in paper production, in terms of the world's land, water and air resources, are high. This raises some important questions. How much paper do we really need and how much is wasted?  

Question 32:

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                                                     PAPER

'Just imagine a day without paper', reads one advertisement for a Finnish paper company. It adds, ‘You almost certainly see our products every day.’. And they're right. But in most industrial countries, people are so (31) _______ to paper - whether it’s for holding their groceries, for drying their hands or for providing them with the daily news - that its (32) _______ in their daily lives passes largely unnoticed. At one (33) _______ paper was in short supply and was used mainly for important documents, but more recently, growing economies and new technologies have (34) _______ a dramatic increase in the amount of paper used. Today, there are more than 450 different grades of paper, all designed for a different purpose. Decades ago, some people predicted a ‘paperless office’. Instead, the widespread use of new technologies has gone hand-in-hand with an increased use of paper. Research into the relationship between paper use and the use of computers has shown that the general (35) _______ is likely to be one of growth and interdependence. However, the costs involved in paper production, in terms of the world's land, water and air resources, are high. This raises some important questions. How much paper do we really need and how much is wasted?  

Question 33:

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                                                     PAPER

'Just imagine a day without paper', reads one advertisement for a Finnish paper company. It adds, ‘You almost certainly see our products every day.’. And they're right. But in most industrial countries, people are so (31) _______ to paper - whether it’s for holding their groceries, for drying their hands or for providing them with the daily news - that its (32) _______ in their daily lives passes largely unnoticed. At one (33) _______ paper was in short supply and was used mainly for important documents, but more recently, growing economies and new technologies have (34) _______ a dramatic increase in the amount of paper used. Today, there are more than 450 different grades of paper, all designed for a different purpose. Decades ago, some people predicted a ‘paperless office’. Instead, the widespread use of new technologies has gone hand-in-hand with an increased use of paper. Research into the relationship between paper use and the use of computers has shown that the general (35) _______ is likely to be one of growth and interdependence. However, the costs involved in paper production, in terms of the world's land, water and air resources, are high. This raises some important questions. How much paper do we really need and how much is wasted?  

Question 34:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate to the word or phrase that best fits each of the numbered blanks:

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 20:  

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate to the word or phrase that best fits each of the numbered blanks:

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 22:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate to the word or phrase that best fits each of the numbered blanks:

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 21:  

Read the following passage and mark the letter A,B ,C or D on your  answer sheet  to indicate the correct word or phrase that best fits each of the numbered blanks blanks:

Teaching English as a foreign language can be a great way to travel the world and earn money at the same time. However, some graduates actually like the idea of (4) ............... a career in teaching English long-term, and there are numerous courses at various (5) ............... of teaching, from the fast-track TEFL to a diploma or masters. To find the right course a good place to start is TEFL.com – an Internet site with lots of relevant information and helpful advice, including a comprehensive list of institutions in the UK offering TEFL courses. The site also offers a job search facility to assist qualified students (6) ............... finding work.  When deciding which course to take, the best bet is to look at what your needs are. If you want a career in teaching English then definitely find one designed for that (7) ..........., like an MA or diploma; but if you want to travel around the world, then do a shorter course which will supply you with teaching skills. Some countries, like Japan, will employ people without a teaching qualification as (8) ............. as the teacher is a native speaker of English. However, most countries do now expect a qualification.

Question 6: