Dãy các oxit tác dụng với dung dịch NaOH là: CuO, Fe2O3, SO2, CO2. CaO, CuO, CO, N2O5. SO2, MgO, CuO, Ag2O. CO2, SO2, P2O5, SO3.

Vẽ coan mèo hoặc calli : Mèo ( tone xám nhạt )

HÃY DÙNG CÁC TỪ TRONG NGOẶC ĐƠN ĐỂ KẾT HỢP HAI MỆNH ĐỀ ĐÃ CHO SẴN 1. If you don’t start studying, you will fail the exams. (otherwise/or)  ……………………………………………………………………………………………………………….  ………………………………………………………………………………………………………………. 2. We didn't want to get home late after the film. We went straight back. (so)  ………………………………………………………………………………………………………………. 3. Dr. Johnson ate a big meal. He went to work afterward. (before)  ………………………………………………………………………………………………………………. 4. In case the weather was bad, the wedding will be held indoors. (In case of)  ………………………………………………………………………………………………………………. 5. Some people in the crowd became ill and fainted because it was extremely hot. (because of)  ………………………………………………………………………………………………………………. HÃY DÙNG ĐẠI TỪ QUAN HỆ ĐỂ KẾT HỢP HAI MỆNH ĐỀ ĐÃ CHO SẴN 1. The place was really beautiful. We spent our holiday there.  ………………………………………………………………………………………………………………. 2. Opposite our house is a nice park. There are some beautiful trees in this park.  ………………………………………………………………………………………………………………. 3. John was the only player to perform well. He scored three goals in the first game,  ………………………………………………………………………………………………………………. 4. They decided not to swim in that small lake. That small lake looked rather dirty.  ………………………………………………………………………………………………………………. 5. This is Mr. Tom. His son won the championship last year.  ……………………………………………………………………………………………………………….

Calli: Sẽ có ngày tôi về với cậu thôi... Yc: Có tâm, tone tối, có bg, tradi, khonq nhận các trường hợp mới tập vt, k đổi đề

Oxit axit là: Những oxit không tác dụng với dung dịch bazơ và dung dịch axit. Những oxit tác dụng với dung dịch bazơ tạo thành muối và nước. Những oxit tác dụng với dung dịch axit tạo thành muối và nước. Những oxit chỉ tác dụng được với muối.

Calli: / Du co ra sao thi toi mai yeu cau ..^^ / Yc: Có tâm, tone tối, có bg, tradi, khonq nhận các trường hợp mới tập vt, k đổi đề

Vẽ mầm Nl bất lực khi t nấu cơm quên nút h tận 12h ms ăn đc

Dãy các oxit tác dụng với dung dịch axit clohiđric (HCl) là: Fe2O3, CuO, Na2O, Al2O3. SO2, MgO, CO2, Ag2O. CaO, CO, N2O5, ZnO. CuO, Fe2O3, CO2, FeO.

D. Choose the correct sentence among A, B, C or D which has the same meaning as the given one. 9. I might go camping. My friends have invited me. A. My friends have invited me to go camping. B. My friends have invited me go camping. C. My friends have invited me going camping. D. My friends have invited me that I might go camping. 10. I haven’t enjoyed myself so much for years. A. It’s years since I enjoyed myself so much. B. It’s years since I have enjoyed myself so much. C. It was years since I had enjoyed myself so much. D. It has been years since I have enjoyed myself so much. 11. Have you heard the good news? A. Carol in March had a baby. B. In March, Carol had a baby. C. Carol had in March a baby. D. In March, had Carol a baby. 12. Although the driver slammed on his brakes, __________________ A. he was able to avoid hitting the small dog. B. the small dog was not hit by the car. C. he could run over the small dog. D. he couldn’t avoid hitting the small dog. 14. This is my tenth year working in this bank. A. By the end of this year , I will work in this bank for ten years. B. I have worked in this bank for ten years by the end of this year. C. By the end of this year , I will have worked in this bank for ten years. D. I had been working in this bank for ten years by the end of this year. 15. The famous actor was last seen in 2000. A. The famous actor has not been able to see since 2000. B. No one has seen the famous actor since 2000. C. The famous actor didn’t see anyone in 2000. D. No one saw the famous actor until 2000. 16. I came to live here three months ago. A. It was three months since I lived here. B. I’ve been living here for three months. C. I lived here for three months. D. I didn’t live here for three months. 17. She is sitting in a hotel room. Through the window, she sees a fat man. A. She looks through the window and sees the fat man. B. She and the fat man are in a hotel room. C. The fat man wants to open the window and come in. D. The fat man is looking in through the window. 18. She goes to the shops every Friday. A. She goes every day to the shop but not on Friday. B. It’s not Friday, but she’s going to the shops. C. She always goes to the shops on Friday. D. She never goes to the shops on Friday. 19. Michael took a deep breath and dived into the water. A. After Michael had taken a deep breath, he dived into the water. B. Having taken a deep breath, he dived into the water. C. After Michael took a deep breath, he had dived into the water. D. A & B are correct. 20. We started working here three years ago. A. We worked here for three years. B. We have no longer worked here for three years. C. We have worked here for three years. D. We will work here in three years. 21. It’s a long time since we last went to the cinema. A. We have been to the cinema for a long time. B. We haven’t been to the cinema for a long time. C. We don’t go to the cinema as we used to. D. We wish we went to the cinema now. 22. I haven’t finished this book yet. A. I’m still reading this book. B. I have read this book before. C. The book I’m reading hasn’t finished. D. I will read this book some day. 23. He used to jog every morning. A. He enjoys jogging every morning. B. He never fails to jog every morning. C. He doesn’t now jog every morning. D. He intended to jog every morning. 24. I have never felt happier than I do now. A. I felt happier before. B. I feel happy now. C. I have never felt happy. D. I have always felt happy. 25. He last had his eyes tested ten months ago. A. He hasn’t had his eyes tested for ten months . B. He had not tested his eyes for ten months then. C. He had tested his eyes ten months before. D. He didn’t have any test on his eyes in ten months. 26. Someone knocked on the door during my lunchtime. A. I had lunch when someone knocked on the door. B. When I had had lunch, someone knocked on the door. C. I was having lunch when someone was knocking on the door. D. I was having lunch when someone knocked on the door. 27. Steve left before my arrival. A. When I arrived, Steve had already left. B. Steve left as soon as I arrived. C. While Steve was leaving I arrived. D. Steve hadn’t left until I arrived. 28. I haven’t been here before. A. Being here is a pleasant experience. B. This is the first time I have been here . C. I have wished to be here for long. D. Before long I will be here. 29. The last time I saw Rose was three years ago. A. I hasn’t seen Rose for three years. B. I haven’t seen Rose three years ago. C. I haven’t seen Rose since three years. D. I haven’t seen Rose for three years. 30. When we arrived, the children were playing “Hide and Seek” A. The children played “Hide and Seek” and then we arrived. B. While the children were playing “Hide and Seek”, we arrived. C. We arrived at the same time the children played “Hide and Seek”.

Phần trăm khối lượng của Ca có trong CaO là: 71,43 % 42,86% 57,14% 28,57 %