user-avatar
luuthithuhuong.a1.k55
2 năm trước
Hai hợp chất X và Y (MX < MY) đều gồm ba nguyên tố trong đó có nguyên tố Nhôm (Al). Cho X tác dụng với axit dư, sản phẩm tạo thành có hai chất tan trong đó có chứa Y. Cho Y tác dụng với kiềm dư, sản phẩm tạo thành có hai chất tan trong đó có X. Em hãy chọn một cặp chất X, Y phù hợp. Viết các phương trình phản ứng xảy ra? Giúp mình với ạ ☺☺☺
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Choose the phrase or clause A, B, C or D that best completes each sentence. 11. The attorney told his client that ___________________________. A. they had little chance of winning the case B. the case was of a small chance to win C. it was nearly impossible to win him the case D. the case had a minimum chance to be won by him 12. One of the professor’s greatest attributes is ____________________________. A. when he gives lectures B. how in the manner that he lectures C. the way to give lectures D. his ability to lecture 13. _____________________ received law degrees as today. A. Never so many women have B. Never have so many women C. The women aren’t ever D. Women who have never 14. The students liked that professor’s course because ________________________. A. there was few if any homework B. not a lot of homework C. of there wasn’t a great amount of homework D. there was little or no homework 15. Since he changed profession, Fred’s yearly income has ______________________. A. nearly tripled B. got almost three time bigger C. almost grown by three times D. just about gone up three times.

Choose the best way of making up the sentence from the words and phrases given. 6. education/ give/ knowledge/ things/ around/ and/ it/ preserve/ national/ noble traditions and customs/ generation. A. Education gives us knowledge of things around us and it preserves the national noble traditions and customs from generation to generation. B. Education gives us the knowledge of things around us and preserves national noble traditions and customs for generation and generation. C. Education has given us knowledge about the things around us and it preserves the national and noble traditions and customs for generation and generation. D. Education is giving us knowledge of things around us and it preserves the national and noble traditions and customs from generation to generation. 7. You/ ask/ things/ yourself/ especially/ reason/ you/ decide/ apply/ job. A. You may ask many things by yourself, and especially about the reason you decide to apply for a job. B. You may ask many things yourself, and especially the reason why you have decided to apply for the job. C. You may be asked many things about yourself, and especially the reason why you have decided to apply for the job. D. You may be asked many things about yourself, and especially about the reason why you decide to apply for the job. 8. some/ pesticides/ fertilizers/ we/ spray/ crops/ find/ dangerous. A. Some pesticides and fertilizers which we spray on our crops are found dangerous. B. Some of pesticides and fertilizers we spray to our crops are found to be dangerous. C. Some of the pesticides and fertilizers we are spraying with our crops have been found to be dangerous. D. Some of the pesticides and fertilizers we have sprayed on our crops have been found to be dangerous. 9. appearance/ steamboats/ railroads/ reduce/ transportation cost/ effects/ conditions/ workers. A. Appearance of the steamboats and the railroads have reduced transportation cost and had effects in conditions of workers. B. The appearance of steamboats and railroads reduced transportation cost and had effects on the condition of workers. C. The appearance of the steamboats and railroads have reduced transportation cost and had effects on conditions of workers. D. The appearance pf steamboats and railroads had reduced transportation cost and had effects on conditions of workers. 10. If/ there/ flying saucers/ be/ traces/ landing. A. If there were flying saucers, it would be traces of their landing. B. If there were flying saucers, there would be traces of their landing. C. If there were flying saucers, there will be traces of their landing. D. If there are flying saucers, there would be traces of their landing.

Exercise 3: Sentence writing Choose the correct sentence which has the same meaning as the given. 1. That makes him think of something that happened to him when he was a little boy. A. That reminds him to tell us about something happening to him when he was a little boy. B. That brings back some memory of his boyhood. C. His mind was full of memories of his boyhood. D. He was a thoughtful boy who always thinks of the things that happened to him when he was a little boy. 2. Transportation has been made much easier thanks to the invention of cars, but cars are the greatest contributor of air pollution. A. The invention of cars has made transportation much easier, but cars are among the greatest contributors of air pollution. B. Although the invention of cars has made transportation much easier, people use cars to contribute to the pollution of air. C. It is cars that are the greatest contributor of air pollution although the invention of cars has made transportation much easier. D. However easier the invention of cars has made transportation, it is cars that are among the greatest contributors of air pollution. 3. Nothings but the whole story would satisfy Tim. A. Tim insisted on being told the complete story. B. Tim wouldn’t be satisfied with anything. C. Tim wanted to know just the end of the story. D. On the whole, Tim was satisfied with the story. 4. May I suggest Monday for our trip to Paris? A. We must go to Paris on Monday. B. We would be allowed to go to Paris on Monday. C. Monday is the only day for us to go to Paris. D. Monday would be a good day for us to go to Paris. 5. Not taking a difficult exam is worse than failing it. A. It is better to fail a difficult exam than not to take it at all. B. If one is going to fail a difficult exam, it is better not to take it. C. To fail a difficult exam is worse than not to take it. D. Because the exam is difficult, it is better not to take it.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team