Khi cho từ từ dung dịch NaOH cho đến dư vào ống nghiệm đựng dung dịch hỗn hợp gồm HCl và quỳ tìm. Hiện tượng quan sát được trong ống nghiệm là: A. Màu đỏ mất dần. B. Không có sự thay đổi màu C. Màu đỏ từ từ xuất hiện. D. màu đỏ mất dần, Màu xanh từ từ xuất hiện Nhúng 1 thanh nhôm nặng 20 gam vào dung dịch FeSO4. Sau một thời gian lấy lá nhôm ra rửa nhẹ, làm khô rồi cân lại thấy thanh nhôm nặng 31,4 gam. khối lượng nhôm đã tham gia phản ứng? Al= 27, Fe= 56 2,7 gam 5,4 gam 27 gam 54 gam Để nhận biết 2 loại phân bón hoá học là: KNO3 và KCl. Ta dùng dung dịch: A/ NaOH B/ Ba(OH)2 C/ AgNO3 D/ BaCl2 Dãy các chất tác dụng được với dung dịch HCl tạo thành sản phẩm có chất khí: A. BaO, Fe, CaCO3 B. Al, MgO, KOH C. Zn, Fe2O3, Na2SO3 D. Na2SO3, CaCO3, Zn Clo là chất khí có màu A. nâu đỏ. B. vàng lục. C. lục nhạt. D. trắng xanh Làm hộ với

viết đoạn văn 200 chữ trình bày suy nghĩ về ý nghĩa của viêc tự hiểu mình

Vẽ anime siêu tức. Hôm nay cày đc 20 câu mà chả về đc 1 cái hay nhất!

G. In some of these sentences, the past simple form is incorrect. Underline the incorrect verbs and write the sentence correctly. Tick the correct sentences. 1. I taked a lot of photos yesterday. _____________________________. 2. I did my homework this morning. _____________________________. 3. We speaked to the teacher earlier. _____________________________. 4. I had cereal for breakfast. _____________________________. 5. You comed home late last night. _____________________________. 6. My grandfather fighted in World War 2. _____________________________.

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Mít, Tèo và Tí ngồi nói chuyện với nhau về sinh nhật của mình. Mít nói rằng: - Ngày sinh của tớ không vượt quá 12. Tớ sẽ nói nhỏ ngày sinh cho Tèo và nói nhỏ tháng sinh cho Tí. Sau khi Mít nói nhỏ với từng bạn xong thì Tèo suy nghĩ một lúc rồi nói: - Tí không thể biết được ngày sinh nhật của Mít. Tí cũng suy nghĩ một lúc rồi nói: - Tèo cũng không biết được sinh nhật của Mít đâu. Hai bạn cứ suy nghĩ một lúc rồi lại thay phiên lặp đi lặp lại hai câu trên. Cho tới một lúc Tí nói: - Bây giờ tớ và Tèo có thể biết được sinh nhật của Mít rồi. Hay thật! Đó là câu chuyện dài nhất mà chúng tớ có thể có trước khi tìm ra sinh nhật của Mít. Hỏi sinh nhật Mít là ngày nào?

Giải pt : `x^2+ \sqrt{x+2010} =2010`

3 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. Many people now think that teachers give pupils too much homework. They say that it is unnecessary for children to work at home in their free time. Moreover, they argue that most teachers do not properly plan the homework tasks they give to pupils. The result is that pupils have to repeat tasks, which they have already done at school. Recently many parents complained about the difficult homework which teachers gave to their children. The Greek parents said that most of the homework was a waste of time, and they wanted to stop it. Spain and Turkey are two countries, which stopped homework recently. In Denmark, West Germany and several other countries in Europe, teachers cannot set homework at weekends. In Holland, teachers allow pupils to stay at school to do their homework. The children are free to help one another. Similar arrangements also exist in some British schools. Most people agree that homework is unfair. A pupil who can do his homework in a quiet and comfortable room is in a much better position than a pupil who does his homework in a small, noisy room with the television on. Some parents help their children with their homework. Other parents take no interest at all in their children’s homework. It is important, however, that teachers talk to parents about homework. A teacher suggests suitable tasks for parents to do with their children. Parents are often better at teaching their own children. According to many parents, _____. A: children shouldn’t be given marks for homework B: teachers do not set enough homework. C: children are too lazy to do D: a lot of homework has not been planned properly 4 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. Many people now think that teachers give pupils too much homework. They say that it is unnecessary for children to work at home in their free time. Moreover, they argue that most teachers do not properly plan the homework tasks they give to pupils. The result is that pupils have to repeat tasks, which they have already done at school. Recently many parents complained about the difficult homework which teachers gave to their children. The Greek parents said that most of the homework was a waste of time, and they wanted to stop it. Spain and Turkey are two countries, which stopped homework recently. In Denmark, West Germany and several other countries in Europe, teachers cannot set homework at weekends. In Holland, teachers allow pupils to stay at school to do their homework. The children are free to help one another. Similar arrangements also exist in some British schools. Most people agree that homework is unfair. A pupil who can do his homework in a quiet and comfortable room is in a much better position than a pupil who does his homework in a small, noisy room with the television on. Some parents help their children with their homework. Other parents take no interest at all in their children’s homework. It is important, however, that teachers talk to parents about homework. A teacher suggests suitable tasks for parents to do with their children. Parents are often better at teaching their own children. Pick out the statement that is not true. A: Children can do their homework at school and help each other in some schools in Britain. B: All parents show great interest in their children’s homework. C: Teachers should advise the parents about how to work together with their children at home. D: Only a small number of people think homework is fair.

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