Câu 1: hỗn hợp gồm propen & propin cho qua dd AgNO 3 / NH 3 dư thu được 6g kết tủa. Nếu cùng hỗn hợp trên qua dd brom dư thì thấy phản ứng hết 200 ml dd brom 0,4 M. a) Tính % V mỗi khí trong hỗn hợp trên b) Tính độ tăng khối lượng của bình đựng dd brom ( cho Ag = 108, C = 12, Br = 80, N = 14, O = 16 )

Cho mình xin hình vẽ bài này với ạ dùng hình ảnh nha

Giúp mình bài này với hứa vote 5sao có 3 trang nha làm đúng nha mn

cho hình thang vuông abcd như hình vẽ. Đáy lớn dài 25cm, chiều cao bằng 1,2dm và đáy nhỏ bằng 3/5 đáy lớn. a) Tính diện tích của hình thang đã cho. b) Diện tích hình tam giác BHC bằng bao nhiêu phần trăm diện tích hình thang ABCD?

1 What is your favourite vacation spot? write a paragraph from 100 words to tell about this place. You should write: What's the name of this spot? Where is it? How often do you come here? Who do you often go with? What do you often do here and why do you like it? THE END giúp e vs ❤

Complete the sentences using the past simple form of the verbs. 1. I _____ at home all weekend. ( stay) 2. Angela ______ to the cinema last night. (go) 3. My friends ______ a great time in Nha Trang last year. (have) 4. My vacation in Hue ______ wonderful. (be) 5. Last summer I _____ Ngoc Son Temple in Ha Noi. (visit) 6. My parents ____ very tired after the trip. ( be) 7. I _______ a lot of gifts for my little sister. (buy) 8. Lan and Mai _______ sharks, dolphins and turtles at Tri Nguyen aquarium.(see) 9. Trung _____ chicken and rice for dinner. (eat) 10. They ____ about their holiday in Hoi An. (talk) 11. Phuong _____ to Hanoi yesterday. (return) 12. We _____ the food was delicious.(think) 13. Yesterday, I (go)______ to the restaurant with a client. 14. We (drive) ______ around the parking lot for 20 mins to find a parking space. 15. When we (arrive) ______ at the restaurant, the place (be) ______ full. 16. The waitress (ask) ______ us if we (have) reservations. 17. I (say), "No, my secretary forgets to make them." 18. The waitress (tell)______ us to come back in two hours. 19. My client and I slowly (walk) ______ back to the car. 20. Then we (see) ______ a small grocery store. 21. We (stop) in the grocery store and (buy) ______ some sandwiches. 22. That (be) ______ better than waiting for two hours. 23. I (not go) ______ to school last Sunday. 24. She (get) ______ married last year? 25. What you (do) ______ last night? - I (do) ______ my homework. 26. I (love) ______ him but no more. 27. Yesterday, I (get) ______ up at 6 and (have) ______ breakfast at 6.30. 28. They (buy ) ……………. that house last year. 29. She (not go) …………. to school yesterday. 30. That boy ( have ) …………… some eggs last night.

Cho tam giác ABC vuông tại A, AC = 4cm, BC = 6 cm. Kẻ tia Cx vuông góc với BC (Tia Cx và điểm A khác phía so với đường thẳng BC). Lấy trên tia Cx điểm D sao cho BD = 9cm tính tỉ số diện tích hai tam giác ABC và BDC giúp vứoi cho 5 sao

Giải giúp mik bài này nhé ( nói rõ cụ thể phải có dẫn chứng, không nêu ngắn gọn quá) hứa vote

tổ một và tổ hai chăm sóc 28.500m2 rung sau khi chuyển 2500m2 rừng của tổ 1 sang cho tổ hai chăm sóc thì to 2 nhiều hơn to 1 là 400m2 rung hỏi lúc dau mỗi tổ chăm sóc bao nhiêu m2 rừng

Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. She had learned English for five years and then she went to London. A: She had learned English for five years after she went to London. B: She had learned English for five years before she went to London. C: Before she had went to London, she learned English for five years. D: She learned English for five years before she went to London. 25 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. - “Thank for inviting me, but I’m sorry I have to finish my homework” - “_________” A: Great. I really had a good time. B: I hope you enjoy it. C: Oh. What a pity! D: That’s good. 26 Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Christer Fuglesang said he enjoyed floating around in the____environment. A: weightless B: homesick C: heavy D: quiet 27 Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. “That’s the coolest thing I’ve ever seen. It’s really ___________ this world.” A: into B: out of C: over D: on 28 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. A Mission to Mars Have you ever had a dream of traveling to another planet in our solar system? If you have, there is an actual programme that is happening right now, and it hopes to send people to Mars in 2023. Known as the Mars One Mission, it will send a crew of four people on a one -way mission to colonize Mars. Those chosen people will have to be ready to say good-bye to the earth forever, as there will not be a return trip. For the people chosen, they will have to learn to do many different things. First of all, they will be living the rest of their lives with just a handful of other people, so they all must have personalities that allow them to get along. Second, the living quarters that they will have won’t be very spacious, so they will have to deal with that condition as well. If they feel homesick, they will only be able to communicate with people back on the earth via e-mail, video and audio sent back and forth. However, there won’t be any real-time communication. Even at the speed of light, communication between the earth and Mars takes about 20 minutes. Whether the Mars One Mission will actually happen is the big question that a lot of people are asking. There is an enormous skepticism in the science community, and Wired magazine gave the mission a miserable score of two out of ten on its probability scale. However, for those who dream of going to Mars, at least they can say there is a possibility that it could happen. How long will it take for a message to come back from Mars? A: Only a few seconds B: Almost immediately C: About an hour D: Around 20 minutes 29 Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. I passed all my exams - I’m ___________! A: over the moon B: out of the moon C: once in a blue moon D: out of this world 30 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. He"s been a bit depressed ever since he got his bad exam results. A: stressed B: nervous C: frustrated D: delighted