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phatnguyen614
2 năm trước
1.Oxi hóa 48,9 ml rượu etylic 70,55 độ, Sau một thời gian thu được hh chất lỏng Y Cho kim loại Na dư vào hh Y thấy thoát ra 20,16 lít H2.tính hiệu suất oxi hóa rượu.Biết rằng oxi hóa xảy ra tạo axit axetic
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Exercise 15. Rewrite the following sentences, beginning as shown, so that the meaning stays the same. 1. Jakarta doesn’t have as many skyscrapers as Shanghai. → Shanghai 2. You forgot to turn off the T.V last night, didn’t you? → You didn’t remember ? 3. The countryside doesn’t suffer as much pollution as the city. → The countryside 4. I think you should go to work by bike. → Who don’t ? 5. New York has more billionaires than Tokyo. → Tokyo 6. We will plant more trees along this street. → More trees 7. Does overpopulation cause a lot of social problems in this area? → Overpopulation ? 8. Is pollution the most serious problem? → Pollution is ? 9. A group of foreigners visited the slums last week, didn’t they? → Did ? 10. Mr Lam lived in the country when he was a child. → Mr Lam used

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