Hòa tan hoàn toàn 33g hỗn hợp gồm(MgCO3, Mgo) bằng 253g dd axit HCl( vừa đủ) . Sau ph/ứng thu đc 5,6l khí thoát ra (đktc) a)Tính khối lượng mol của MgCO3

Question 11. [TH] Read the text and choose the correct answer A, B, C, or D for each of the questions. I often hear or read about ‘natural disasters’ – the eruption of Mount St. Helen, a volcano in the state of Washington. Hurricane Andrew in Florida, the floods in the America Midwest, terrible earthquakes all over the world, huge fires, and so on. But I’ll never forget my first personal experience with the strangeness of nature – ‘the London Killer Fog’ of 1952. It began on Thursday, December 4, when a high-pressure system of warm air covered southern England. With the freezing-cold air below, heavy fog formed. Pollution from factories, cars and coal stoves mixed with the fog. The humidity was terribly high, there was no breeze at all. Traffic such as cars, trains, boats stopped. People couldn’t see, and some walked onto the railroad tracks or into the river. It was hard to breathe, and many people got sick. Finally, on Tuesday, December 9, the wind came and the fog went away. But after that, even more people got sick. Many of them died. What is the writer’s unforgettable personal experience? A. the London killer B. the heavy fog in London in 1952 C. a high-pressure system D. the strangeness of nature Question 12. [TH] Read the text and choose the correct answer A, B, C, or D for each of the questions. I often hear or read about ‘natural disasters’ – the eruption of Mount St. Helen, a volcano in the state of Washington. Hurricane Andrew in Florida, the floods in the America Midwest, terrible earthquakes all over the world, huge fires, and so on. But I’ll never forget my first personal experience with the strangeness of nature – ‘the London Killer Fog’ of 1952. It began on Thursday, December 4, when a high-pressure system of warm air covered southern England. With the freezing-cold air below, heavy fog formed. Pollution from factories, cars and coal stoves mixed with the fog. The humidity was terribly high, there was no breeze at all. Traffic such as cars, trains, boats stopped. People couldn’t see, and some walked onto the railroad tracks or into the river. It was hard to breathe, and many people got sick. Finally, on Tuesday, December 9, the wind came and the fog went away. But after that, even more people got sick. Many of them died. How long did the “London Killer Fog” last? A. For four days B. For five days C. For six days D. For a week

en cần gấp , giải thì chi tiết 1 xíu ạ.

Question 13. [TH] Read the text and choose the correct answer A, B, C, or D for each of the questions. I often hear or read about ‘natural disasters’ – the eruption of Mount St. Helen, a volcano in the state of Washington. Hurricane Andrew in Florida, the floods in the America Midwest, terrible earthquakes all over the world, huge fires, and so on. But I’ll never forget my first personal experience with the strangeness of nature – ‘the London Killer Fog’ of 1952. It began on Thursday, December 4, when a high-pressure system of warm air covered southern England. With the freezing-cold air below, heavy fog formed. Pollution from factories, cars and coal stoves mixed with the fog. The humidity was terribly high, there was no breeze at all. Traffic such as cars, trains, boats stopped. People couldn’t see, and some walked onto the railroad tracks or into the river. It was hard to breathe, and many people got sick. Finally, on Tuesday, December 9, the wind came and the fog went away. But after that, even more people got sick. Many of them died. What didn’t happen during the time of the ‘London Killer Fog’? A. Pollution B. Heavy rain C. Humidity D. Heavy fog Question 14. [TH] Read the text and choose the correct answer A, B, C, or D for each of the questions. I often hear or read about ‘natural disasters’ – the eruption of Mount St. Helen, a volcano in the state of Washington. Hurricane Andrew in Florida, the floods in the America Midwest, terrible earthquakes all over the world, huge fires, and so on. But I’ll never forget my first personal experience with the strangeness of nature – ‘the London Killer Fog’ of 1952. It began on Thursday, December 4, when a high-pressure system of warm air covered southern England. With the freezing-cold air below, heavy fog formed. Pollution from factories, cars and coal stoves mixed with the fog. The humidity was terribly high, there was no breeze at all. Traffic such as cars, trains, boats stopped. People couldn’t see, and some walked onto the railroad tracks or into the river. It was hard to breathe, and many people got sick. Finally, on Tuesday, December 9, the wind came and the fog went away. But after that, even more people got sick. Many of them died. Why did the traffic stop? A. Because of the rain B. Because of the windy weather C. Because of the humid weather D. Because of the heavy fog

Giúp mình với mình chx biết làm

Có mấy đại từ xưng hô trong câu sau:tôi thấy cậu bé nhặt đồng tiền. Giải thích cho mình luôn nhé

Question 15. [NB] Choose the best option A, B, C, or D to complete each sentence. If it rains, we ________ the match. A. cancel B. will cancel C. cancelled D. cancelling Question 16. [TH] Choose the best option A, B, C, or D to complete each sentence. Australia has the biggest _________ in the world. A. natural beauty B. puzzling games C. cattle station D. population Question 17. [TH] Choose the best option A, B, C, or D to complete each sentence. The USA has a population of about 304 million, and it’s the third _______ country in the world. A. smallest B. largest C. narrowest D. highest Question 18. [NB] Choose the best option A, B, C, or D to complete each sentence. If the factory __________ dumping poison into the lake, all the fish and other aquatic animals will die. A. will continue B. to continue C. continue D. continues Question 19. [NB] Choose the best option A, B, C, or D to complete each sentence. The woman sitting next to me on the plane was very nervous. She __________ before. A. hasn’t flown B. hadn’t flown C. didn’t fly D. doesn’t fly Question 20. [NB] Choose the best option A, B, C, or D to complete each sentence. Using ________ including Facebook, YouTube, etc as a means of communication has become very popular among young people. A. social media B. email C. letters D. telepathy Question 21. [TH] Choose the best option A, B, C, or D to complete each sentence. How many languages are _________ in China? A. speak B. speaking C. spoken D. speaker

Vì sao phong trào yêu nước và cách mạng Việt Nam đầu thế kỉ XX theo hướng dân chủ tư sản với 2 xu hướng bạo động và cải cách

em cần đáp án bây giờ ạ mai em phải nộp bài rồi

Giờ nên học lập trình pascal hay c/c++?