Cho 13,4 g hỗn hợp A gồm Fe ,Al, Mg phản ứng hết với dung dịch HCl thu được 11,2 lít khí H2. Mặt khác cho 1,2 mol hỗn hợp A phản ứng vừa đủ với 17,92 lít O2 thu được chất rắn B gồm oxit sắt từ nhôm oxit và Magie oxit. Các khí đo ở đktc 1. Viết phương trình hóa học xảy ra. 2. Tính thành phần % khối lượng của các kim loại trong hỗn hợp A

Đốt cháy hoàn toàn 0,014 mol hỗn hợp 2 ankin kế tiếp nhau trong dãy đồng đẳng. Sản phẩm cháy cho hấp thụ hết vào dung dịch chưa 0,03 mol Ca(OH)2 thấy tạo ra 2 gam kết tủa trắng. Công thức phân tử của 2 ankin và thể tích của chúng (đktc) là A. C2H2; 0,2688 lít và C3H4; 0,0448 lít B. C2H2; 0,0448 lít và C3H4; 0,2688 lít C. C3H4; 0,2688 lít và C4H6; 0,0448 lít D. C3H4; 0,0448 lít và C4H6; 0,2688 lít

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giúp em với ạ có gì em vote 5 sao B. USE OF ENGLISH Part I. Choose the best option (A, B, C, D) to complete the following sentences (2,0 points) 1. We often go swimming ……………….. Sunday morning. A. in B. on C. at D. for 2. Find the word in which the underlined part is pronounced differently. A. teacher B. reason C. idea D. feature 3. Football is an example of a …………….. sport where you play with several other people. A. team B. individual C. indoor D. dangerous 4. The smallest …………………. in the world is Australia. A. continent B. ocean C. country D. city 5. I’d like to watch motor racing because it is very …………….. A. frightening B. exciting C. excited D. boring 6. Find the word in which the underlined part is pronounced differently. A. clear B. prepare C. ear D. fear 7. Team sports are sometimes called ………………………. sports. A. running B. healthy C. intelligent D. competitive 8. Some developed nations namely Britain, France and Germany are located in …………… A. America B. Asia C. Australia D. Europe Part II. Put the verbs in brackets into the correct forms (1,25 points) 9. Nam (not/ do) …………………………. his homework last week. 10. (you/ watch) …………............................. the tennis match on TV yesterday? 11. Jane (not/be)…………………. at the party last Sunday. 12. I (have)………………………… a wonderful holiday with my family last July. 13. Please (hurry) …..................... up, we are going to be late for school again. Part III. Complete the second sentence so that it has a similar meaning to the first. (0,5 points) 14. Minh plays football very well.  Minh is very good………………………………………………………….. 15. We do a lot of outdoor activities in summer.  We take part in………………………………………………………….. C. READING Part I: Read and answer the questions. (1,5 points) My last Sports Day occurred on the 8th of September in 2016. On that day, the school was beautifully decorated with colorful flags. Parents were invited to watch their children participate in many events. In the morning, our class was divided into four groups and they competed against one another. The children used balls, hoops, skipping-ropes and bags in the competition. The parents cheered them very much. In the afternoon, we had more interesting events. The Upper Primary students competed in many sports such as hurdles, relay races, short distance races, high jump and long jump. Every participant tried their best to win as many trophies as possible for their team. The prize-giving ceremony marked the end of the exciting day. The winners were cheered and carried on their classmates’ shoulders. Though we were very tired, we had enjoyed ourselves very much. 16. When did her last Sports Day take place? …………………………………………………………………………………………. 17. What was the school decorated with? …………………………………………………………………………………………. 18. Who were invited to watch her children participate in many events? …………………………………………………………………………………………. 19. What did the children use in the competition? …………………………………………………………………………………………. 20. What sports did the Upper Primary student compete in? …………………………………………………………………………………………. 21. Why did the participants try their best? …………………………………………………………………………………………. Part II. Complete the passage with the words from the box. (1,25 points) Hi Steve, Greetings from Rome! We arrived at 8:30 this morning and are staying in a lovely hotel in the city centre. It is near all the (22)_________ attractions. The weather is warm and (23)________! The city looks really amazing. We can’t wait to (24)_________ everything! This afternoon, we are going to take a stroll (25)_________ the Centro Storico (Historic Center), which beautiful historic squares – Piazza Campo de’ Fiori and Piazza Navona. Tomorrow morning, we are going to visit Colosseum, the largest amphitheater ever built in Roman Empire, and then we are (26)_________up the Palatine Hill. In the afternoon we are going to visit Pasta Museum. It’s going to be a great weekend! I must go now. See you when I come back. Love, Army D. WRITING Use the given words/ phrases to write complete sentences. (1,0 points) 27. We/ go/ skiing yesterday. ………………………………………………………………………………………………… 28. Last week/ we/ study/ how/ surf. It/ be/ very interesting. ………………………………………………………………………………………………… walking tourist explore around sunny29. I/ not play/ badminton last Sunday/ because I/ be/ ill. ………………………………………………………………………………………………… 30. Where/ be/ the children yesterday morning? They/ be/ at the swimming pool. …………………………………………………………………………………………………

hãy viết câu lệnh in ra 100 số tự nhiên từ 1 đến 100

Giải giùm 5×5/27+7/20-5/27+0,65

Help me :v Tớ thật sự cần gấp :((

The rice must be cleaned before cooking. --> You ..............................................................

giải giúp mik nha mik sẽ vote 5*

quá trình gia cong cơ khí là a.tạo cho chi tiết có hình dáng và kích thước xác định b.tạo cho chi tiết có tính chất xác định phù hợp với yêu cầu kỹ thuật c.a,b đúng d.a,b sai