Hàm số nào dưới đây đồng biến trên khoảng ?  

Cho 26,9 gam hỗn hợp gồm Mg, Zn và Fe vào 400ml dung dịch Cu(NO3)2 0,75M và AgNO3 1,25M. Kết thúc phản ứng thu được dung dịch X và chất rắn Y gồm 2 kim loại. Cho NaOH dư vào dung dịch X, lọc lấy kết tủa nung ngoài không khí đến khối lượng không đổi thu 30,0 gam hỗn hợp gồm 2 oxit. Phần trăm số mol của Zn trong hỗn hợp ban đầu là.         

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 26:

Cho hỗn hợp X gồm 0,12 mol CuO; 0,1 mol Mg và 0,05 mol Al2O3 tan hoàn toàn trong dung dịch chứa đồng thời 0,15 mol H2SO4 (loãng) và 0,55 mol HCl, thu được dung dịch Y và khí H2. Nhỏ từ từ dung dịch hỗn hợp Ba(OH)2 0,1M và NaOH 0,6M vào Y đến khi thu được khối lượng kết tủa lớn nhất, lọc kết tủa đem nung đến khối lượng không đổi, thu được m gam chất rắn khan. Giá trị của m gần nhất với giá trị nào sau đây?         

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 29:

Cho dãy các kim loại: Fe, Cu, Mg, Ag, Al, Na, Ba. Số kim loại trong dãy phản ứng được với dung dịch HCl là  

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 28:

Kim loại nào sau đây không phản ứng với dung dịch CuSO4?         

Read the following passage and choose 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:

Why is it that many teenagers have the energy to play computer games until late at night but can’t find the energy to get out of bed (26) __________ for school? According to a new report, today’s generation of children are in danger of getting so (27)________ sleep that they are putting their mental and physical health at (28)_________. Adults can easily survive on seven to eight hours sleep a night, (29)____________teenagers require nine or ten hours. According to medical experts, one in five youngsters (30)___________ anything between two and five hours sleep a night less than their parents did at their age.

Question 30:  

ư

Cho dãy các kim loại: Na, Ca, Cu, Fe, K. Số kim loại trong dãy tác dụng với H2O tạo dung dịch bazơ là:          

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 from 27 to 31:

Human beings have a strong need to put their experiences and problems into words. That is why everyone (27)… a “friendly ear” - someone who is willing to listen to their troubles and joys. But few people (28)……what a complex skill listening is. To be a good listener requires great powers of concentration, which can only be gained through practice. There are two reasons why listening is often such hard (29)……The first is simply that people much prefer to speak. How often have you missed what someone has said because you were thinking about what you were going to say (30)…The second reason is that people speak too slowly. The average speed is about 125 words per minute, (31)……is not fast enough for the human brain. It allows too much time for the oncentration to fail, as the brain tries to keep itself busy with other, irrelevant thoughts.

Question 29: