Hỗn hợp khí A gồm có oxi và clo tác dụng hết với hỗn hợp gồm 2,70 g nhôm và 16,25 g kẽm thu hỗn hợp các chất rắn X. Hòa tan hoàn toàn X cần dùng vừa đủ 600 ml dung dịch HCl 1M thu 3,36 lít H2 (đktc). Tính thành phần phần trăm về thể tích mỗi khí trong hỗn hợp A.
giúp mình câu 3 nhé.nếu được thì làm câu 6 luôn nhé
nhận biết các hóa chất mất nhãn sau: dd KI, NaF, NaCl, NaBr
Một ô tô, khối lượng là 4 tấn đang chuyển động đều trên con đường thẳng nằm ngang với vận tốc 10m/s, với công suất của động cơ ô tô là 20kW. a. Tính hệ số ma sát giữa ô tô và mặt đường. b. Sau đó ô tô tăng tốc, chuyển động nhanh dần đều và sau khi đi thêm được quãng đường 250m vận tốc ô tô tăng lên đến 54 km/h. Tính công suất trung bình của động cơ ô tô trên quãng đường này và công suất tức thời của động cơ ô tô ở cuối quãng đường. Lấy g = 10m/s2 Áp dụng kiến thức chương IV Lý 10 ( không áp dụng định luật II Niuton )
Làm giúp mình đi ạ Mình cần lắm rồi
5. The common side ...................of this kind of medicine are feeling dizzy and vomiting. A. effect B. effects C. affect D. affects
Choose the sentence that has the same meaning with the given one. 1. He moved to live in Binh Dinh 5 years ago. A. He has moved to live in Binh Dinh for 5 years. B. He has lived in Binh Dinh for 5 years C. He has to live in Binh Dinh 5 years ago. D. He has lived in Binh Dinh since 5 years 2. “ Please come into my office.”, the principal said to me. A. The principal asked me to come into his office. B. The principal asked me to come into my office. C. The principal told me came into his office. D. The principal told me coming into his office 3. He intends to invite me to his party tonight. A. He invited me to his party tonight. B. He is going to invite me to his party tonight. C. He has to me to his party tonight. D. He invites me to his party tonight. 4. The house is cheaper than the villa. A. The villa is the most expensive home. B. The villa is more expensive than the house. C. The villa is as expensive as the house. D. The villa is different from the house.
V. WRITING: 1. Do as directed: a. Do you like your new school? Why? (Answer the question) ___________________________________________________ b. There are some books in my school bag. (Rewrite the sentence) My school bag ______________________________________ c. Na lives in a villa in a hilly area. ( Write the negative) ___________________________________________________ d. He walks to school. (Rewrite the sentence) He goes ____________________________________________ 2. Write a short paragraph about your house by complete the sentences below: a. My house is nice and small. b. It/ near/ lake. _______________________________________________ c. There/ a living room/ a kitchen/ my house. ________________________________________________________. d. There/ 2 bedrooms/ second floor. _______________________________________________________. e. My bedroom/ a bed/ a wardrobe/ a piano. ______________________________________________________. f. I love it very much.
33. What is the distance between Hai Duong to Hue? A. How far it is between Hai Duong to Hue? B. How far is it from Hai Duong to Hue? C. How far is from Hai Duong to Hue? 34. My uncle drove carelessly some years ago, but now he doesn’t any more. A. My uncle used to driving carelessly some years ago. B. My uncle used to drive carefully some years ago. C. My uncle used to drive carelessly some years ago. 35. I found the film exciting. A.I was excited about the film B.The film was excited . C.I think the film is excited . 36. Rose Kateslet is the most attractive star in The USA. A.No stars in USA is attractive than Rose. B. No stars in USA are as attractive as Rose. C. No stars in USA are as attractive than Rose. 37. He bought a new CD yesterday A. A new CD is bought yesterday B. A new CD was bought yesterday. C. A new CD bought yesterday. VI. Re-arrange the words to make meaningful sentences. 38. will/ street./ along/ More/ this/ be/ trees/ planted A. More trees will be planted along the street. B. More trees will be planted along this street. C. More trees along this street will be planted. 39. two hours/ It/ to/ letter./ me/ that/ takes/ write A. It takes me two hours write that letter. B. It takes two hours to me write that letter. C. It takes me two hours to write that letter. 40. She last met her friend two week ago. A. She hasn’t met her friend for two weeks. B. She hasn’t met her friend two weeks ago. C. She has met her friend for two weeks.
Tinh gia tri moi bieu thuc dai so sau tai m-1 va n=2 a ) 3m-2n b ) 7m+2n-6
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