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Hoangybi
1 năm trước
Trong phòng thí nghiệm, người ta dùng khí Hidro để khử Nhôm oxit và thu được 13,5g Nhôm. a)Viết PTHH của phản ứng b)Tính khối lượng Nhôm oxit đã phản ứng c) Tính thể tích khí Hidro đã dùng d)Đốt cháy hoàn toàn lượng khí Hidro ở trên trong bình đựng 44,8 lít khí oxi. Chất nào còn dư? Dư bao nhiêu gam? (các khí đó ở đktc)
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Mong các anh chị giúp chiều em nộp rồi I. Hoànthànhcâusửdụngthìhiệntạihoànthành 1. We (not / work)________________ today. 2. I (buy) ________________ a new car. 3. I (not / plan) ________________ my holiday yet. 4. Which country (be / you) ________________ ? 5. She (write) ________________ four letters. 6. He (not / see) ________________ her for a long time. 7. (be / you) ________________ at company? 8. The film (not / start) ________________ 9. (speak / she) ________________ to her boss? 10. No, she (have / not) ________________ the time yet. II. Hoànthànhcâusửdụngthì HTHT 1. Loan ________________me an e-mail. (to send) 2. Linh and Ngọc ________________the museum. (to visit) 3. We ________________at the pet shop. (to be) 4. He ________________already ________________his rucksack. (to pack) 5. Tuấn ________________an accident. (to have) 6. I ________________the shopping for my mother. (to do) 7. I ________________just ________________my room. (to clean) 8. Long ________________his room. (to paint) 9. Thư and Tú ________________to a concert. (to go) 10. My boyfriend ________________smoking. (to give up) III. Bàitậptổnghợpcácthìkhácnhau 1. you / keep a pet for two years 2. you / eat Taiwan food before? 3. it / rain for a long time? 4. who / we / forget to invite? 5. we / not / hear that poem already 6. she / not / forget her books 7. He / steal all the chocolate 8. I / explain it well? 9. who / she / meet recently? 10. how / we / finish already? 11. she / study Latin 12. I / know her for two months 13. where / you / study English? 14. what countries / they / visit in Asia? 15. she / hurt her leg 16. He / leave his phone in a bus 17. I / not / lose my ticket 18. He / call his mother? 19. She / take a taxi? 20. He / go / to the library today IV. Bàitậpnângcao 1. Did you like the new ‘Starwar’ movie? I __________ it yet. A. did not see B. haven’t seen 2. Linh is a very close friend of mine. We __________ each other for seven years. A. have known B. know 3. Do you know what time Ánh __________ the office? A. left B. has left 4. You __________ late for work too many times this year. If you’re not careful you’ll be fired. A. were B. have been 5. I __________ quite a few emotional problems last month but this month things are getting better. A. had B. have had 6. We had an exchange student from Laos who __________ the sea so we’re taking her to a beach this weekend. A. never saw B. has never seen 7. Since I started working here I __________ more experienced at dealing with challenges. A. have become B. became 8. I can’t remember the last time I __________ to the pool. A. went B. have been

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