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2 năm trước
Cho m(g) X2 tác dụng vừa đủ với kim loại M có hóa trị (I) thu được 8,24g hợp chất A. Cũng m(g) X2 tác dụng hết cới Al tạo ra 7,12g hợp chất B. Nếu cho lượng kim loại M trên tác dụng hết với lưu huỳnh thì tạo ra 3,12g hợp chất C. a, Xác định tên X và M. b, Tìm m.
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VII. Use the given words to write the complete sentences. 1.Vietnamese people / often / clean / decorate / houses / Tet. ………………………………………………………………………………………………… 2.Angel Falls / Venezuela / high / waterfall / the world. ………………………………………………………………………………………………… 3.It / very / interesting / take / boat trip / the Perfume River. ………………………………………………………………………………………………… 4.Which / dry / Sahara Desert / or / Atacama Desert? ………………………………………………………………………………………………… 5.Ha Noi / capital / Viet Nam. It / history / more than 1,000 years. ………………………………………………………………………………………….……… 6.Eat / and / talk / friends / be / most common ways / relax / recess / many countries. ………………………………………………………………………………………………… 7.Could / tell / how / get / police station / please? ………………………………………………………………………………………………… 8.How much / cost / mail / letter / USA? ………………………………………………………………………………………………… 9.What time / Mai / usually / go / school ? ………………………………………………………………………………………………… 10. This exercise / not / so / difficult / that one. ………………………………………………………………………………………………… VIII. Complete the second sentence so that it means the same as the first one. 1.Shall we go to the Japanese Covered Bridge first? Let’s …………………………….…………………………………………..…….…………! 2.No one in the office is cleverer than Mr. Edward. Mr. Edward ………………………………………………………………………..…..……. 3.Travelling abroad for a holiday is much more expensive than travelling in your country. Travelling in your country………………………………………………….………………… 4.She goes to work at eight forty-five. She goes to work at fifteen ………………………..……………….……………..……….. 5.Would you mind telling me the way to the National Museum? Can………………………….………………………………………………………, please? 6.Vietnamese students have fewer vacations than American ones. American students ……………………………….………………..…………..……………… 7.It’s against the rules to use your mobile phone in class. You……………………………………………………………..…………………..…………. 8.We have a two - month summer vacation. Our summer vacation lasts……………………………….………………………………...… 9.It’s a good idea to listen to the weather forecast before going camping. You ……………………………………………..……………………………………………. 10. Nam isn’t so good at English as Minh. Minh ……………………………..than Nam. IX.Read the passage then do the tasks below. Hi! I am Nam. I’m twelve years old. I’m a student in grade 6, class 6A2. I live with my parents and my sister. We live in a small house in the country. This is my school. It is small and old but it is beautiful. In front of the school, there is a big yard. It is clean and there are many tall trees and beautiful flowers. In the afternoon, I often play soccer with my friends there. My school has fifteen classrooms and six hundred students. There are forty-three teachers in my school. They are good teachers. I love them and I love my school very much. a. Answer the questions. 1.Where does Nam live?  ………………………………………………………………………………………………. 2. Are there many tall trees and beautiful flowers in the school yard? …………………………………………………………….…………………………………. 3. How many teachers does his school have? ……………………………………………………………..…………………………………. b. Complete the sentences, using the information from the passage above. 4. ………………….…………………………….…………is small and old but it is beautiful. 5. In the afternoon, Nam often plays soccer with his friends in the ……..…………

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